Toshiba mini NB250 series Maintenance Manual Download

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Toshiba Personal Computer

NB250/NB255

Maintenance Manual

TOSHIBA CORPORATION

Summary of Contents for mini NB250 series

Page 1: ...Toshiba Personal Computer NB250 NB255 Maintenance Manual TOSHIBA CORPORATION ...

Page 2: ... computers and manuals are subject to change without notice Therefore Toshiba assumes no liability for damages incurred directly or indirectly from errors omissions or discrepancies between any succeeding product and this manual Trademarks IBM is a registered trademark and OS 2 and PS 2 are trademarks of IBM Corporation Microsoft MS DOS Windows DirectSound and DirectMusic are registered trademarks...

Page 3: ...ates the existence of a hazard that could result in bodily injury if the safety instruction is not observed CAUTION Caution indicates the existence of a hazard that could result in property damage if the safety instruction is not observed NOTE Note contains general information that relates to your safe maintenance service Improper repair of the computer may result in safety hazards Toshiba require...

Page 4: ...placement of the FRUs Appendices The appendices describe the following Handling the LCD module Board layout Pin assignments Keyboard scan character codes Key layout Screw torque list Reliability Conventions This manual uses the following formats to describe identify and highlight terms and operating procedures Acronyms On the first appearance and whenever necessary for clarification acronyms are e...

Page 5: ...use Break means you must hold down Ctrl and at the same time press Pause Break If three keys are used hold down the first two and at the same time press the third User input Text that you are instructed to type in is shown in the boldface type below DISKCOPY A B The display Text generated by the computer that appears on its display is presented in the typeface below Format complete System transfer...

Page 6: ...ly Troubleshooting Error Bookmark not defined 2 4 Display Troubleshooting Error Bookmark not defined 2 5 Keyboard Troubleshooting Error Bookmark not defined 2 5 External USB Devices Troubleshooting Error Bookmark not defined 2 6 TouchPad Troubleshooting Error Bookmark not defined 2 7 Speaker Troubleshooting Error Bookmark not defined 2 6 Wireless LAN Troubleshooting Error Bookmark not defined 2 7 ...

Page 7: ... Test Error Bookmark not defined 3 5 Fan ON OFF Test 9 3 6 Main Battery Charge Test 11 3 7 FDD Test 11 3 8 Memory Check 14 3 9 Keyboard Test Error Bookmark not defined 3 10 Mouse Pad Test 16 3 11 LCD Pixels Mode Test 17 3 12 Magnetic switch Test 18 3 13 LAN Test 20 3 14 RTC Test 23 3 15 3D Gsensor 24 3 16 1stHDDTest 28 3 17 RDMI Test 30 3 18 WDMI Test 31 3 19 Toshiba Logo set 33 3 20 Dynabook Logo...

Page 8: ...ack Error Bookmark not defined 4 3 HDD Error Bookmark not defined Removing the HDD Error Bookmark not defined Installing the HDD Error Bookmark not defined 4 4 Memory Error Bookmark not defined Removing the Optional Memory Error Bookmark not defined Installing the Optional Memory Error Bookmark not defined 4 5 WLAN Card Error Bookmark not defined Removing the WLAN Card Error Bookmark not defined I...

Page 9: ...t defined Installing the Motherboard Error Bookmark not defined 4 12 Thermal Fan Module Error Bookmark not defined Removing the Thermal Fan Module Error Bookmark not defined Installing the Thermal Fan Module Error Bookmark not defined 4 13 LCD Bezel Assembly Error Bookmark not defined Removing the LCD Bezel Assembly Error Bookmark not defined Installing the LCD Bezel Assembly Error Bookmark not de...

Page 10: ...ing the first pair of screws from the hinge saddleError Bookmark not defined Figure 4 16 Removing the second pair of screws from the hinge saddleError Bookmark not defined Figure 4 17 Detaching the cables from under the keyboard Error Bookmark not defined Figure 4 18 Removing the speaker Error Bookmark not defined Figure 4 19 Removing the screws from the touch pad bracketError Bookmark not defined...

Page 11: ...4 33 Removing the Camera from the LCD panel Error Bookmark not defined Figure 4 34 Removing the LVDS cable from the LCD moduleError Bookmark not defined Appendices Appendix A Handling the LCD Module A 1 Appendix B Board Layout B 1 Appendix C Pin Assignments C 1 Appendix D Keyboard Scan Character Codes D 1 Appendix E Key Layout E 1 Appendix F Series Screw Torque List F 1 Appendix G Reliability G 1 ...

Page 12: ...Chapter 1 Hardware Overview ...

Page 13: ...ew NB250 NB255 Maintenance Manual 1 ii Chapter 1 Contents 1 1 Features 1 1 1 2 2 5 inch HDD 1 8 1 3 Power Supply 1 9 1 4 Batteries 1 11 1 4 1 Main Battery 1 11 1 4 2 Battery Charging Control 1 11 1 4 3 RTC Battery 1 12 ...

Page 14: ...verview NB250 NB255 Maintenance Manual 1 iii Figures Figure 1 1A ID Parts Description Placement Part A 1 4 Figure 1 2 S ATA HDD 1 8 Tables Table 1 1 HDD Specifications 1 8 Table 1 2 Quick Normal Charging Time 1 11 ...

Page 15: ......

Page 16: ...tel PineviewTM Processor Memory BTO The computer has one SODIMM slot which comes standard with 1GB 2GB accepting BTO for your memory requirements It can incorporate up to 1 GB XP or 2 GB Vista Linux of main memory It supports DDR3 at 667MHz Battery Pack BTO The computer is powered by one rechargeable and removable lithium ion battery pack The capacity can be either 3 cell or 6 cell depending on th...

Page 17: ...port for VESA DDC2B compatible functions A WDDM driver is ready for Vista Universal Serial Bus USB Ports The computer has three USB 2 0 ports It is supported to daisy chain a maximum of 127 USB devices The serial data transfer rate is 480 Mbps or 12 Mbps and 1 5 Mbps These ports support PnP installation and hot plugging Bridge Media Slot This slot allows you to insert SD SDHC MiniSD MicroSD throug...

Page 18: ...Microphone Line in Jack A 3 5mm mini microphone jack enables connection of a three conductor microphone for monaural input and also enables the connection of a stereo device for audio input LAN The computer has built in support for 10M 100M Ethernet LAN 10 100 megabits per second 10 100BASE T It employs a Realtek 8105E for 10M 100Mbit LAN Wireless LAN BTO Some computers in this series are equipped...

Page 19: ...A shows the computer and its system unit configuration External monitor port Thermal vent holes USB USB Sleep and Charge function is supported by this port only Figure 1 1A ID Parts Description Placement Part A NB250 NB255 Maintenance Manual 1 4 ...

Page 20: ... SO DIMM Intel Calistoga GSE SPI ROM page 4 1 8V DDRII 400 533 page 4 5 page 28 HDA Codec page 12 Memory BUS DDRII BGA 652 page 28 page 6 7 8 9 10 Intel ICH7M Thermal Sensor page 11 page 15 16 17 18 page 29 ENE KB926 D3 LED Conn Model Name KAVAA page 13 page 21 SATA HDD SSD EMC1402 22x22mm 5V 1 5GHz 150MB s SATA port 0 HD Audio 3 3V 24 576MHz 48Mhz PCIe 1x 2 4 LPC BUS 3 3V 33 MHz USB 5V 480MHz PCI...

Page 21: ... GB Vista Linux of main memory It supports DDR3 at 667MHz BIOS ROM EEPROM The system BIOS and Keyboard BIOS share one single 1024KB flash ROM The flash utility can be used to program both system and keyboard BIOS at the same time System Controllers ACPI2 0b and Windows Logo Program 3 0 compliant Support SMBus specification V2 0 Hot keys for system control Audio volume output control Battery scope ...

Page 22: ...tek Azalia ALC272 One Audio in port Mic in Line in One Audio out port Headphone out Line out Internal Microphone MIC with echo cancellation Volume control Digital control Hot keys Fn 3 Fn 4 Microsoft inbox audio driver support Wireless LAN Controller Atheros 802 11 bg HB95 1x1 WPS supported ...

Page 23: ...capacities supported are 120 and 160 GB The HDD is shown in Figure 1 2 and some of its specifications are listed in Table 1 1 Figure 1 2 S ATA HDD Table 1 1 HDD Specifications Item Specifications Capacity GB 160 GB 250G Rotational Speed RPM 5400 RPM 5400 Height 9 5mm 2 5 9 5mm 2 5 User Data Sectors 312 581 808 488 397 168 Bytes Sector 512 512 NB250 NB255 Maintenance Manual 1 8 ...

Page 24: ...rging power supply Issues a charging current instruction to the PWM control IC of the battery pack charging power supply Controls the supply of DC power supply input AC Adapter output to the power supply unit Controls the supply of power to the system block load logic circuit side Controls forced shutdown if the power supply malfunctions 3 Logic circuit control Instructs the gate array to enable d...

Page 25: ...1 10 6 Output monitor Monitors the voltage output to the system block load logic circuit side Monitors the voltage over voltage input output current of the battery pack Monitors the internal temperature of the battery pack Monitors the supply voltage from the AC adapter ...

Page 26: ...en the AC adapter is detached 1 4 2 Battery Charging Control Battery charging is controlled by EC KB926 When the AC adapter and battery pack are attached to the computer the EC KB926 controls the charge on off state and detects a full charge Battery Charge When the AC adapter is attached the battery is charged by off state charge when the system is powered off or by on state charge when it is powe...

Page 27: ...he AC adapter or battery pack is removed 3 The battery or AC adapter voltage is abnormal Detection of full charge A full charge is detected only when the battery is being charged by quick or normal charge A full charge is detected when either of the following conditions is met 1 The current in the battery charging circuit drops below the predetermined value 2 The charging time exceeds the fixed li...

Page 28: ...Chapter 2 Troubleshooting Procedures 2 ...

Page 29: ......

Page 30: ...Troubleshooting 14 2 5 Keyboard Troubleshooting 17 2 5 External USB Devices Troubleshooting 19 2 6 TouchPad Troubleshooting 21 2 7 Speaker Troubleshooting 23 2 6 Wireless LAN Troubleshooting 25 2 7 Camera Troubleshooting 27 2 8 Bluetooth Troubleshooting 29 2 9 2in1 card Troubleshooting 31 2 10 HDD SSD Troubleshooting 33 2 13 CRT Troubleshooting 36 2 14 LAN Troubleshooting 38 2 17 3G Troubleshootin...

Page 31: ...oubleshooting process 25 Figure 2 7 Speaker troubleshooting process 27 Figure 2 8 Wireless LAN troubleshooting process 29 Figure 2 9 Camera troubleshooting process 31 Figure 2 10 Bluetooth troubleshooting process 33 Figure 2 11 2 in 1 card troubleshooting process 35 Figure 2 12 HDD SSD troubleshooting process 37 Figure 2 13 CRT troubleshooting process 39 Figure 2 14 LAN troubleshooting process 41 ...

Page 32: ...x screw nuts on the rear ports for RAM door 3 2DD or 2HD formatted work disk for floppy disk drive testing 4 Torx screw driver with type T6 bit for HDD door 5 USB memory disk 6 Multimeter 7 External monitor ODD 8 USB compatible keyboard 9 Multimedia sound system with line in and line out ports 10 Headphones 11 USB test module and USB cable 12 MIC line 2 2 Troubleshooting Flowchart If you know the ...

Page 33: ...2 Troubleshooting Procedures NB250 NB255 Series Maintenance Manual 4 Make sure all optional equipment is removed from the computer ...

Page 34: ...hen press E nter Is T oshiba W indow s or L inux being loaded A Y es Y es Y es Y es Y es Y es P erform the P ow er S upply T roubleshooting procedures in section 2 3 P erform diagnostics program R un C M 165 E X E and select the H A R D D IS K item P erform the P ow er S upply T roubleshooting procedures in section 2 3 N o N o N o N o N o P erform the P ow er S upply T roubleshooting procedures in...

Page 35: ...each test to perform automatically Is an error detected by any of the diagnostics tests System is normal End Yes Yes Yes No Perform the Keyboard Troubleshooting procedures in section 2 6 Perform the FDD Troubleshooting procedures in section 2 5 After confirming which diagnostics test has detected an error perform the appropriate procedure as outlined below No No Yes Figure 2 1 Troubleshooting flow...

Page 36: ... perform the Power Supply Troubleshooting procedures in Section 2 3 2 If an error is detected by the display test perform the Display Troubleshooting procedures in Section 2 4 3 If an error is detected by the keyboard test perform the Keyboard Troubleshooting procedures in Section 2 5 4 If an error is detected by the TouchPad test perform the TouchPad Troubleshooting procedures in Section 2 7 5 If...

Page 37: ...edures in Section 2 6 2 If an error is detected when using the speakers perform the Speaker Troubleshooting procedures in Section 2 8 3 If an error is detected when using the Wireless LAN perform the Wireless LAN Troubleshooting procedures in Section 2 10 4 If an error is detected when using the Bluetooth perform the Bluetooth Troubleshooting procedures in Section 2 12 5 If an error is detected wh...

Page 38: ...atus Procedure 1 No Yes Check power supply connections Procedure 3 Run diagnostic program Procedure 4 Yes No Replace adaptor battery Procedure 2 No Perform internal connection check Procedure 5 Replace system board Yes Figure 2 2 Power Supply Troubleshooting Process The power supply controls many functions and components To determine if the power supply is functioning properly start with Procedure...

Page 39: ...s check Procedure 2 Adaptor battery replacement Procedure 3 Power supply connection check Procedure 4 Diagnostic check Procedure 5 Internal connection check Procedure 1 Power Status Check The following LEDS indicate the power supply status Battery LED DC IN LED The power supply controller displays the power supply status through the Battery and the DC IN LEDS as listed in the tables below Table 2 ...

Page 40: ...pack and connect an AC adaptor to the DC IN port on the computer and to a power supply If the DC IN LED or Battery LED is not lit go to Procedure 2 Procedure 2 Adaptor battery replacement A faulty adaptor may not supply power or may not charge the battery Perform Check 1 Check 1 Connect a new AC adaptor If the problem is not resolved go to Check 2 Check 2 Insert a new battery If the problem is sti...

Page 41: ... wall outlet If these cables are connected correctly go to Check 3 Check 3 Make sure that the DC IN input port socket is firmly secured to the system board of the computer If the DC IN input socket is loose go to Procedure 5 If it is not loose go to Check 4 Check 4 Use a multi meter to make sure that the AC adaptor output voltage is close to 19 V If the output is several percent lower than 19 V go...

Page 42: ... Procedure 5 Replacement check The system board may be disconnected or damaged Disassemble the computer following the steps described in Chapter 4 Replacement Procedures Check the connection between the AC adaptor and the system board After checking the connection perform Check 1 Check 1 Use a multi meter to make sure that the fuses on the system board are not blown If a fuse is not blown go to Ch...

Page 43: ...S T A R T D oes the ex ternal disp lay function ok P erform diagno stic check P rocedure 2 N o W as a display prob lem detected P erfo rm connector and rep lacem ent check P rocedure 3 R eplace sy stem board E N D Y es Y es N o D isplay is n ot faulty C o ntinue trou bleshooting refer to F igu re 2 1 Figure 2 3 Display troubleshooting process ...

Page 44: ...mputer The computer automatically detects the external display If the external display works correctly the internal LCD may be damaged Go to Procedure 3 If the external monitor appears to have the same problem as the internal monitor the system board may be damaged Go to Procedure 2 Procedure 2 Diagnostic check The Display Test program is stored on the computer s Diagnostics disk This program chec...

Page 45: ...e computer and then perform the following checks Check 1 Make sure the DDR module is seated properly Test display again If the problem still exits replace the DDR RAM module If the problem still exists perform Check 2 Check 2 Replace the LCD module with a new one and test display again If the problem still exists perform Check 4 Check 3 Replace the LCD cable with a new one and test display again I...

Page 46: ...ex tern al k ey b o ard fu n ctio n o k P erfo rm d iag n o stic ch eck P ro ced u re 2 W as a k ey b o ard p ro b lem d etected P erfo rm co n n ecto r an d rep lacem en t ch eck P ro ced u re 3 R ep lace sy stem b o ard E N D Y es N o K ey b o ard is n o t fau lty C o n tin u e tro u b lesh o o tin g refer to F ig u re 2 1 N o Y es Figure 2 4 Keyboard troubleshooting process ...

Page 47: ...ew one and following the instructions in Chapter 4 Procedure 2 Diagnostic check Run the test and Diagnostics Program which will automatically execute the Keyboard Test Refer to Chapter 3 Tests and Diagnostics for more information on how to run the program If an error is located go to Procedure 3 If an error does not occur the keyboard is functioning ok Procedure 3 Connector and replacement check T...

Page 48: ... rigin al U S B device is fau lty P erfo rm ex ternal d ev ice and co n nectio n ch eck P ro cedu re 1 S T A R T D o es th e device fun ction w h en con n ected to a d ifferen t U S B po rt D o es an altern ativ e U S B d ev ice fun ctio n co rrectly N o Y es N o C h eck U S B p ort co nn ectio n Y es Figure 2 5 External USB device troubleshooting process ...

Page 49: ... still does not work go to Check 4 If the device functions correctly when connected to another USB port go to Check 3 Check 3 Make sure that the USB socket is firmly secured to the system board of the computer If the malfunction remains the system board or USB small board may be damaged Go to Procedure 2 Check 4 Connect an alternative USB device to one of the computer s USB ports and then boot the...

Page 50: ...cedures NB200 Series Maintenance Manual 21 2 6 TouchPad Troubleshooting START END TouchPad connection check Procedure 1 TouchPad replacement check Procedure 2 Replace system board Figure 2 6 Touchpad troubleshooting process ...

Page 51: ...board Make sure the TouchPad FPC cable is firmly connected to the TouchPad and system board Refer to Chapter 4 Replacement Procedures for instructions on how to disassemble the computer and then perform the following checks If any of the connections are loose reconnect firmly If any of the connections is damaged or there is still an error go to Procedure 2 Procedure 2 TouchPad replacement check Th...

Page 52: ...c ed u re 2 D o ea rp h o n e s fu n ctio n c o rre c tly P erfo rm c o n n ec tio n c h e c k P ro c ed u re 3 P e rfo rm rep la ce m e n t c h e ck P ro c ed u re 4 P e rfo rm au d io so u rce te st P ro c ed u re 1 No Y es Y es R e p la c e system b o ard S p e a k ers are n o t fa u lty C o n tin u e tro u b lesh o o tin g se e F ig u re 2 1 N o Figure 2 7 Speaker troubleshooting process ...

Page 53: ...oblem is in the monaural devices If all have the same problem continue with Procedure 2 Procedure 2 Earphone test Connect a set if earphones or external speakers If these function correctly go to Procedure 3 If they do not function correctly the system board may be defective or damaged Replace it with a new one Procedure 3 Connection check Disassemble the computer following the steps described in ...

Page 54: ...and replacement check Procedure 2 Replace wireless LAN antenna unit Replace system board END Yes Wireless LAN system is not faulty Continue troubleshooting refer to Figure 2 1 No Figure 2 8 Wireless LAN troubleshooting process The wireless LAN antenna wire wireless LAN unit or system board may each be the source of a wireless LAN fault Any of these components may be damaged To determine if the ...

Page 55: ...s and perform the following checks Check 1 Make sure that the wireless LAN antenna is firmly connected to the Wireless LAN module refer to Chapter 4 for instructions and that the wireless LAN module is securely slotted into the system board If the problem persists go to Check 2 Check 2 Check that the wireless communication function is enable by BIOS setup and FN F8 and then make sure that the wire...

Page 56: ...272 Troubleshooting Procedures NB200 Series Maintenance Manual 27 2 7 Camera Troubleshooting Figure 2 9 Camera troubleshooting process ...

Page 57: ... test result If tests and diagnostics result abnormal go to Procedure 2 If an error is not located the Camera system is functioning properly Procedure 2 Connector and replacement check The Camera board or system board may be disconnected or damaged Disassemble the computer following the steps described in Chapter 4 Replacement Procedures and perform the following checks Check 1 Make sure that the ...

Page 58: ...292 Troubleshooting Procedures NB200 Series Maintenance Manual 29 2 8 Bluetooth Troubleshooting Figure 2 10 Bluetooth troubleshooting process ...

Page 59: ... If an error is not located the Bluetooth system is functioning properly Procedure 2 Connector and replacement check The Bluetooth antenna module or system board may be disconnected or damaged Disassemble the computer following the steps described in Chapter 4 Replacement Procedures and perform the following checks Check 1 Make sure the Bluetooth cable is securely slotted into the system board If ...

Page 60: ...a new one following the instructions in Chapter 4 2 9 2in1 card Troubleshooting START Do errors occur during 2 IN 1 CARD test Perform 2 IN 1 card socket replacement check Procedure 2 Replace system board END 2 IN 1 unit is not faulty Perform 2 in 1 CARD test Procedure 1 No Yes Figure 2 11 2in 1 card troubleshooting process ...

Page 61: ... 2 in 1 card test program Ensure the card in fully inserted into the socket before running the program If an error occurs during the 2in 1 card test perform Procedure 2 If no error occurs it is likely that the original 2 in 1 card was faulty Procedure 2 2 in 1 Card socket check The 2 in 1 Card socket may be damaged or defective for instance the socket pins can be bent Disassemble the computer foll...

Page 62: ...332 Troubleshooting Procedures NB200 Series Maintenance Manual 33 2 10 HDD SSD Troubleshooting Figure 2 12 HDD troubleshooting process ...

Page 63: ...Tests and Diagnostics for more information on the program If an error is located go to Procedure 2 If an error is not located the HDD function is functioning properly Procedure 2 Connector and replacement check The HDD module or system board may be disconnected or damaged Disassemble the computer following the steps described in Chapter 4 Replacement Procedures and perform the following checks Che...

Page 64: ...352 Troubleshooting Procedures NB200 Series Maintenance Manual 35 ...

Page 65: ...R T s e t c h e c k P r o c e d u r e 2 R e p l a c e s y s t e m b o a r d E N D N o R e p l a c e C R T c a b l e Y E S C R T f u n c t i o n i n g o k Y E S U s e d i f f e r e n t C R T s e t N o N O C h e c k C R T P o r t c o n n e c t i o n Figure 2 13 CRT troubleshooting process To determine if the computer s CRT port is functioning properly perform the following procedures Figure 2 7 outl...

Page 66: ...ured to the system board of the computer If the malfunction remains go to Check 3 Check 3 The CRT cable may be damaged Replace with a good cable If the malfunction remains go to Procedure 2 Procedure 2 CRT set check The CRT set may be faulty Perform Check 1 Check 1 Try using the set for CRT reception If it does not work the set may be damaged If the set does work perform Check 2 Check 2 Try connec...

Page 67: ...N s e t c h e c k P r o c e d u r e 2 R e p l a c e s y s t e m b o a r d E N D N o R e p l a c e L A N c a b l e Y E S L A N f u n c t i o n i n g o k Y E S U s e d i f f e r e n t L A N c a b l e N o N O C h e c k L A N P o r t c o n n e c t i o n Figure 2 14 LAN troubleshooting process To determine if the computer s LAN port is functioning properly perform the following procedures Figure 2 7 ou...

Page 68: ...board of the computer If the malfunction remains go to Check 3 Check 3 The LAN cable may be damaged Replace with a good cable If the malfunction remains go to Procedure 2 Procedure 2 LAN set check The LAN set may be faulty Perform Check 1 Check 1 Try using the set for LAN reception If it does not work the set may be damaged If the set does work perform Check 2 Check 2 Try connecting a different LA...

Page 69: ...r system board may be the reason of a MIC fault Either of these two components may be damaged To determine if the computer s MIC is functioning properly perform the following procedures Figure 2 15 outlines the process Start with Procedure 1 and continue with the other procedures as instructed Procedure 1 Diagnostic test ...

Page 70: ...check The MIC line or system board may be disconnected or damaged Disassemble the computer following the steps described in Chapter 4 Replacement Procedures and perform the following checks Check 1 Make sure that the MIC line is securely slotted into the system board If the problem remains go to Check 2 Check 2 The MIC line may be damaged Replace it with a new one following the instructions in Cha...

Page 71: ...s functioning properly perform the following procedures Figure 2 16 outlines the process Start with Procedure 1 and continue with the other procedures as instructed Procedure 1 Diagnostic test Procedure 2 Replacement check Procedure 1 Diagnostic test Run the functioning Program on Windows model which will display the 3D test result If tests and diagnostics result abnormal go to Procedure 2 If an e...

Page 72: ...sassemble the computer following the steps described in Chapter 4 Replacement Procedures and perform the following checks Check 1 Make sure that 3D sensor test operation is correct go to Check 2 Check 2 The system board may be damaged Replace it with a new one following the instructions in Chapter 4 ...

Page 73: ... END Yes 3G system is not faulty Continue troubleshooting refer to Figure 2 1 No Figure 2 17 3G troubleshooting process The 3G antenna wire 3G unit or system board may each be the source of a 3G fault Any of these components may be damaged To determine if the computer s wireless LAN system is functioning properly perform the following procedures Figure 2 17 outlines the process Start with Procedur...

Page 74: ...d to the 3G module refer to Chapter 4 for instructions and that the 3G module is securely slotted into the system board If the problem persists go to Check 2 Check 2 Check the wireless communication function is enabled by BIOS setup and FN F8 and then make sure that the wireless communication LED on the front panel is light If the LED is light but the 3G function is still faulty the antenna may be...

Page 75: ...3 Tests and Diagnostics 1 Chapter 3 Tests and Diagnostics ...

Page 76: ...6 Main Battery Charge Test 11 3 7 FDD Test 11 3 8 Memory Check 14 3 9 Keyboard Test 14 3 10 Mouse Pad Test 16 3 11 LCD Pixels Mode Test 17 3 12 Magnetic switch Test 18 3 13 LAN Test 20 3 14 RTC Test 23 3 15 3D Gsensor 24 3 16 1stHDDTest 28 3 17 RDMI Test 30 3 18 WDMI Test 31 3 19 Toshiba Logo set 33 3 20 Dynabook Logo set 35 3 21 TP TYPE R W TEST 38 3 22 EEPROM setting 41 ...

Page 77: ... for loose connections 2 Exit this program when you are at Main Menu The TEST DIAGNOSTIC PROGRAM contains the following functional tests CONFIG CHECK TEST Audio sound TEST FAN ON OFF TEST MAIN BATTERY CHARGE TEST FDD TEST Memory check KEYBOARD TEST MOUSE PAD TEST LCD PIXELS MODE TEST MAGNETIC SWITCH TEST LAN TEST RTC TEST 3D G sensor test 1st HDD Test RDMI Test WDMI Test Memory Test Toshiba Logo s...

Page 78: ... T D Program can run single test by you press corresponsive English letter of test item and it also asks you if you like to copy test log file to USB disk as reference at the end of test s The test list is as the following A CONFIG CHECK TEST B Audio sound TEST C FAN ON OFF TEST D MAIN BATTERY TEST E FDD TEST F Memory check G KEYBOARD TEST H MOUSE PAD TEST I LCD PIXELS MODE TEST J MAGNETIC TEST K ...

Page 79: ...3 Tests and Diagnostics The below display will show up at the beginning of T D program If the test result passes the following display will show up 5 ...

Page 80: ...error is detected and a test fails the following message displays Then press any key for next actions the below display presented if copying test log file onto diskette is necessary This action will be executed when Y key pressed 6 ...

Page 81: ...agnostics It will skip this process if N key pressed And then it will check if it s necessary to leave this program Program will quit when Y key pressed and it will go back main menu for next test if N key pressed 7 ...

Page 82: ... This Item will show the unit configuration It includes CPU CPU type DDRAM SIZE Panel ID HDD1 type capacity Vendor ID Model Firmware VRAM size VGA CHIP TYPE Battery cell 3cell 6cell Wireless type LAN Type Bluetooth The screen should display as below 8 ...

Page 83: ...OTE Remember to tune up the volume as Maximum before this test starts Buffalo only have one speaker no need test Left Right Speaker The screen should display as below indicating whether the test is passed or failed after the question 3 5 Fan ON OFF Test The fan test allows the user to test aurally whether the fan is working And follow the below procedures for this test 9 ...

Page 84: ...r the fan is working or not NOTE Remember to approach fan outlet that is near right side of unit whether fan is ON The computer will stop the fan working after any key pressed Feel the wind or listen the sound to check if the fan is OFF The screen should display as below indicating whether the test is passed or failed after the question 10 ...

Page 85: ...SKU This test shows and measures the main battery Battery type Lion Manufacturer Sanyo Panasonic Sony Remain charge capacity 0 100 Charge function PASS FAIL Battery Is Full showed when remain charge capacities is 100 The screen should display as below if the charge function is OK will show If the charge function is NG the screen will display as 11 ...

Page 86: ...t includes three subtests of the 1 Sequential seek verify function Range Track 0 79 2 Funnel code seek verify function Range Track 0 79 3 Write Read Compare pattern function Range Track 75 79 NOTE The write protected device of this formatted diskette should be Disable The subtests run automatically NOTE Press Esc key can skip the current subtest The screen should display as below indicating whethe...

Page 87: ...3 Tests and Diagnostics 13 ...

Page 88: ... test will check if the computer s Memory Frequency and Size is correct in every slot Before Memory test start you should choice the below item 1 Memory Read test 2 Memory Write test 3 Memory Read Write test 4 Memory INFO test 3 9 Keyboard Test 14 ...

Page 89: ...arts the keyboard matrix code should be chosen as below display 1 S US for America 2 J Japan for Japan 3 K UK for Europe When you execute this test the keyboard layout is drawn on the display When any key is pressed the corresponding key on the screen changes to black as shown below It will indicate whether the sub test is passed or failed after the question US Keyboard 15 ...

Page 90: ...3 Tests and Diagnostics Japan keyboard UK keyboard 16 ...

Page 91: ...ly 3 10 Mouse Pad Test The Mouse test allows the user to select and assign values to the following using the Touch Pad or Tab key to move between selections 1 Mouse Speed on a scale from slow to fast 2 Acceleration Off Low Medium High 3 Button Assignments Left Right Right button either Unassigned or Drag Lock 4 Swap Buttons Left Right NOTE The Touch Pad test cannot be used to test an external USB ...

Page 92: ...nd this test It will indicate whether the subtests pass or fail after three questions NOTE The above figure has three compartments although the Touch Pad installed may only have two buttons In this case the central compartment in the figure does not correspond to any button 3 11 LCD Pixels Mode Test This LCD pixels mode test checks whether video display is fine This test includes two modes of the ...

Page 93: ...ter the question 3 12 Magnetic Switch Test The Magnetic switch test checks the Magnetic function of the unit When LCD cover closed the Magnetic should enable to turn off the display Follow below steps to run this test 1 Close the LCD cover 2 Open the LCD Then it will indicate whether the test is passed or failed 1 If the Magnetic switch test fail it will show below display 19 ...

Page 94: ...3 Tests and Diagnostics 2 If the Magnetic switch test pass it will show below display 20 ...

Page 95: ...ks the LAN full duplex environment NOTE LAN loopback needs to plug in before test begins And LAN information will show on the test screen IO Base Port A000H IRQ BH it s IRQ B Node it is MAC Address Line Speed 1000Mbps or 100Mbps or 10 Mbps Bus ID it s 14 21 ...

Page 96: ...iagnostics The LAN test includes three subtests of the 1 Speed1000 2 Speed100 3 Speed10 The subtests run automatically The screen should display as below indicating whether the subtests pass or fail when finished 22 ...

Page 97: ...3 Tests and Diagnostics If an error is detected and a test fails the following message displays 23 ...

Page 98: ...Test Checks the computer s RTC Real Time Clock and calendar functions by comparing the DOS and CMOS values The test runs automatically The screen should display as below indicating whether the test is passed or failed when finished 24 ...

Page 99: ...lay of a test program and the set method of PC are shown below Display of a Test Program The portion which PC and Test Fixture contact is green Set method of PC A Z Upper X If the picture shows as below it means the 3D G sensor function is OK Test 2 Set method of PC B 25 Test 3 Set Method of PC 3 Test 4 Rear Upper Right Upper ...

Page 100: ...s Set method of PC 4 Front Upper Test 5 Set method of PC 5 Upper Left Test Result A test result is displayed when a test is completed A display of result is O K or NG And an error flag is returned at the end of a program 26 ...

Page 101: ...3 Tests and Diagnostics If the picture shows as below it means the 3D G sensor function is NG 27 ...

Page 102: ...e HDD test allows the user to verify the 1st HDD ok or not First please select HDD test method Screen would display as below After you select the method then input password hard disk if input password is Right the screen would display as below 28 ...

Page 103: ...s If input password is wrong the screen would display as below The screen will display as below picture to show the subtest is passed or failed when finished If it is show the picture as below it means HDD function is OK 29 ...

Page 104: ...ow it means he HDD function is NG 3 17 Read DMI Compal write Toshiba Part No version Toshiba Serial No Serial No Product Name OEM string and UUID If you want to double check the DMI data please select Read DMI item the figure below will be displayed 30 ...

Page 105: ...stics 3 18 Write DMI When you want to write DMI data please select which data you want to write the figure below will be displayed 1 Write OME string 2 Write Version 3 Write Serial 4 Write Product 5 Back to test title 31 ...

Page 106: ...3 Tests and Diagnostics After write OK you should reboot the system that can make the setting effective or you can write next data before reboot system the figure below will displayed 32 ...

Page 107: ...ata and should reboot the system that can make the setting effective 3 19 Toshiba Logo set Set the computer s Toshiba Logo for other region except Japan SKU The screen should display as below indicating whether the test is passed or failed when finished 33 ...

Page 108: ...3 Tests and Diagnostics Press any key continue to auto set if write OK the following message displays When Toshiba Logo set finish please restart machine when show below Logo 34 ...

Page 109: ...3 Tests and Diagnostics If an error is detected and a test fails the following message displays 3 20 Dynabook Logo set Set the computer s Dynabook Logo for Japan SKU 35 ...

Page 110: ...ould display as below indicating whether the test is passed or failed when finished Press any key continue to auto set if write OK the following message displays When Dynabook Logo set finish please restart machine when show below Logo 36 ...

Page 111: ...3 Tests and Diagnostics If an error is detected and a test fails the following message displays 37 ...

Page 112: ...PE R W TEST This T P TYPE R W test checks the computer s T P TYPE and users write T P vendor ID into EEPROM The test runs automatically The screen should display as below indicating whether the test is passed or failed when finished 38 ...

Page 113: ...3 Tests and Diagnostics If write T P type fail the screen would display as below If read T P type fail the screen would display as below 39 ...

Page 114: ...3 Tests and Diagnostics If W R T P type passes the screen would display as below 40 ...

Page 115: ...ded supported function and no support function NOTE Should perform EE PROM SETTING once change M B It defined as normal rule The screen should display as below If press 1 to set MIC function status in EE PROM the screen should display as below Please check related information to judge this unit whether has MIC function 41 ...

Page 116: ...s MIC function press Y then program will set MIC enable automatically as below If this unit has no MIC function press N then program will set MIC disable automatically as below Then press any key go back to EE PROM SETTING option as below 42 ...

Page 117: ...3 Tests and Diagnostics If press 7 to disable all no support function program will perform automatically as below 43 ...

Page 118: ...3 Tests and Diagnostics 44 ...

Page 119: ...3 Tests and Diagnostics Then press any key to go back to EE PROM SETTING option as below If press 9 program will go back to test title as below 45 ...

Page 120: ...3 Tests and Diagnostics 46 ...

Page 121: ...Chapter 4 Replacement Procedures ...

Page 122: ... 7 Symbol examples 4 7 4 2 Battery 4 8 Removing the Battery Pack 4 8 Installing the Battery Pack 4 9 4 3 HDD 4 10 Removing the HDD 4 10 Installing the HDD 4 12 4 4 Memory 4 13 Removing the Optional Memory 4 13 Installing the Optional Memory 4 14 4 5 WLAN Card 4 15 Removing the WLAN Card 4 15 Installing the WLAN Card 4 16 4 6 Hinge Cover and Keyboard 4 17 Removing the Hinge Cover 4 18 Removing the ...

Page 123: ...lling the Touch Pad Bracket 4 30 4 11 Motherboard 4 31 Removing the Motherboard 4 31 Installing the Motherboard 4 34 4 12 Thermal Fan Module 4 36 Removing the Thermal Fan Module 4 36 Installing the Thermal Fan Module 4 37 4 13 LCD Bezel Assembly 4 38 Removing the LCD Bezel Assembly 4 38 Installing the LCD Bezel Assembly 4 40 4 14 LCD Module 4 41 Removing the LCD Module 4 41 Installing the LCD Modu...

Page 124: ...oving the first pair of screws from the hinge saddle 4 25 Figure 4 16 Removing the second pair of screws from the hinge saddle 4 26 Figure 4 17 Detaching the cables from under the keyboard 4 27 Figure 4 18 Removing the speaker 4 29 Figure 4 19 Removing the screws from the touch pad bracket 4 30 Figure 4 20 Removing the motherboard from logic lower assembly 4 31 Figure 4 21 Removing the DC IN plate...

Page 125: ...t Procedures NB250 NB255 Maintenance Manual 4 v Figure 4 32 Removing the LCD Hinge Assembly 4 42 Figure 4 33 Removing the Camera from the LCD panel 4 44 Figure 4 34 Removing the LVDS cable from the LCD module 4 45 ...

Page 126: ......

Page 127: ...tions according to the section numbers shown in the boxes Then start removal and replacement 4 2 Battery 4 3 HDD 4 4 Memory 4 5 WLAN Card 4 6 Hinge Cover and Keyboard 4 7 Power Board 4 8 Logic Upper Assembly 4 13 Thermal Fan Module 4 15 LCD Bezel Assembly 4 16 LCD Module 4 17 Camera module and LVDS cable 4 9 Speaker 4 10 Touch Pad 4 11 Bluetooth Card 4 14 WiMax Module Optional 4 12 Motherboard How...

Page 128: ...ply and inverter carry high voltages When you partially disassemble the laptop and turn on the components use extreme care not to touch the connectors and components to avoid the risk of electrical shock Do not disassemble individual components during first level maintenance WARNING 1 To avoid the risk of electrical shock turn the laptop off and remove the AC adapter from the electrical outlet 2 B...

Page 129: ... screws can cause short circuits overheating smoke or fire 3 Before removing a FRU or other component make sure that all the component cables have been disconnected to avoid the risk of electrical shock caused by accidental contact with the energized components 4 For AC input be sure to use the AC adapter and AC power cable that come with your laptop or Toshiba recommended equivalents 5 To avoid t...

Page 130: ... in Chapter 2 of this manual to identify the FRU that has probably caused the system failure Perform only the required machine operations Use only the disassembly and reinstallation procedures described in this manual Place the removed components in a safe place away from the laptop so that they are not damaged or get in the way of you doing your work Normally a number of screws need to be removed...

Page 131: ...raising the pressure plate up to a satisfactory height Normal pin connectors are used for all the other types of cables These connectors can be installed or removed by simply inserting them or pulling them out Assembly Procedures You have to reassemble the laptop after you have disassembled the laptop and fixed the component that caused the problem When reassembling the laptop keep the following g...

Page 132: ...rewdriver with type T6 bit Tweezers for pulling out screws ESD mats for the floor and work desks An ESD wrist strap or heel grounder Anti static carpets or flooring Air ionizers for highly electrostatic sensitive areas A plastic card in credit card size Screw Tightening Torque To secure screws follow the torque values listed below Over tightening can damage components and screws Under tightening c...

Page 133: ...top Body For easy maintenance the screw types are shown on the laptop body as symbols A symbol consists of a letter representing the screw type and a numeral representing the screw length Screw type Letter Bind screw B stands for bind Flat head screw F stands for flat head Super flat head screw S stands for super flat head Tapping screw T stands for tapping Other screws U stands for unique pan hea...

Page 134: ...cuit the terminals Do not drop hit twist or bend the battery packs Do not scratch or break up their casing 1 Turn the laptop upside down so that the bottom is facing you 2 Slide the battery safety lock to the unlock position 3 Slide the battery release latch and remove the battery pack from the laptop as shown in Figure 4 1 2 1 3 Figure 4 1 Removing the Battery Pack NOTE Dispose of the used batter...

Page 135: ...er replacement use handling or disposal Always dispose of the battery packs as required by local ordinances or regulations Use only replacement batteries recommended by Toshiba NOTE Visually check the battery s terminals If they are dirty clean them with a dry cloth 1 Gently insert a new or recharged battery pack into place Check that the battery release latch slides in and stops with a click 2 Sl...

Page 136: ...ng such pressure can either corrupt the data in the drive or damage the drive Remove the HDD hard disk drive according to the following procedures and Figure 4 2 4 3 and 4 4 1 To remove the HDD remove two M2 5x4 HDD door TORX screws that secure the HDD door and then remove the HDD door as shown in Figure 4 2 Figure 4 2 Removing the HDD door M2 5x4 TORX 2 ...

Page 137: ...nect it from HDD connector 3 Lift up and remove the HDD pack from HDD bay as shown in Figure 4 3 Figure 4 3 Removing the HDD from the HDD bay NOTE Do not disassemble the HDD pack when it is working normally Disassemble or replace the HDD pack only if it fails 4 Place the HDD pack on a flat surface such as a desk ...

Page 138: ...ing procedures CAUTION To avoid damage always hold the HDD only by its sides 1 Place the HDD into the HDD plate 2 Secure the HDD and its plate with four M3x3 screws CAUTION To prevent the HDD plate from being distorted when installing the HDD pack into the laptop do not press the center of the HDD pack Always hold the HDD pack by its sides 3 Install the HDD pack into the correct position in the la...

Page 139: ...p is turned off CAUTION Remove the optional memory after turning off the laptop If this is violated the laptop or memory can be damaged 1 Turn the laptop upside down 2 Remove one M2 5Dx4 screw that secures the RAM door 3 Remove the RAM door as shown in Figure 4 5 CAUTION Do not touch the connectors on the memory or in the laptop Contaminated connectors can cause memory access problems Figure 4 5 R...

Page 140: ...hecking that the laptop is turned off CAUTION Install the optional memory after turning off the laptop If this is violated the laptop or memory can be damaged 1 Insert the memory into the connector at an angle of about 30 degrees 2 Press down on the memory module so that it is secured with both memory lock latches 3 Reinstall the optional RAM door 4 Secure the RAM door with one M2 5Dx4 screw After...

Page 141: ...ing the WLAN Card Remove the WLAN card according to the following procedures and Figure 4 7 1 Detach the two antennas on the WLAN card 2 Remove two M2x3 screws that secure the WLAN card as shown in Figure 4 7 3 Pull the WLAN card out at an angle Figure 4 7 Removing the WLAN card M2x3 2 WLAN Card ...

Page 142: ...N Card Install the WLAN card according to the following procedures 1 Insert the WLAN card into the connector 2 Press the card down and secure it with two M2x3 screws 3 Attach the two antennas to the WLAN card The white MAIN antenna to the 1 connector and the black AUX antenna to the 2 connector ...

Page 143: ...ver and Keyboard according to the following procedures and Figure 4 8 4 9 and 4 10 1 Remove the following twelve screws as shown in Figure 4 8 seven M2 5x6 screws five M2 5x4 screws 2 Detach any WLAN and modem antennas from their respective cards Figure 4 8 Removing the screws from the bottom of the laptop M2 5x6 7 M2 5x4 5 ...

Page 144: ...oks as indicated in Figure 4 9 Figure 4 9 Detaching three hinge cap hooks 2 Turn the laptop upright and open the LCD cover to the maximum angle 3 Push the hinge cover toward the battery bay with an outward rolling motion until the hinge cover tabs are released from the system and the hinge cover comes loose as shown in figure 4 10 4 Remove the hinge cover from the system Figure 4 10 Removing the H...

Page 145: ...d Figure 4 11 1 Open the laptop 2 Unfasten the four hooks on the sides of the logic upper assembly Lift up the keyboard and remove the cable connecting it to the motherboard NOTE Hooks fastening flat type keyboards will be located on the logic upper assembly rather than the keyboard itself 3 Remove the keyboard Figure 4 11 Removing the keyboard Hooks Hooks ...

Page 146: ...ogic upper assembly 2 Seat the keyboard in its correct position making sure the four hooks on either side are fastened 3 Seat the hinge cover in the correct position and firmly click into place 4 Close the laptop 5 Turn the laptop upside down Make sure all three hinge cap hooks are firmly in place 6 Secure the laptop with twelve screws as indicated in Figure 4 8 seven M2 5x6 screws five M2 5x4 scr...

Page 147: ...n the direction of the arrows in Figure 4 12 2 Remove the power board cable from the motherboard 3 Press down the latch that protrudes to the power board on its right side Push the power board in the direction indicated in figure 4 12 and slide the power board out 4 Remove the power board from the logic upper assembly Figure 4 12 Removing the Power Board Note Be careful not to damage the Power Boa...

Page 148: ...t position on the logic upper assembly 2 Slide the power board to the end of the track until the latch clicks into place 3 Place the power board cable into the connector on the motherboard 4 Use tweezers and a finger to push down on the left and right latches of the connector Both latches must be pushed simultaneously to secure the power board cable 5 Secure the power board cable with adhesive tap...

Page 149: ...c Upper Assembly Removing the Logic Upper Assembly Remove the logic upper assembly according to the following procedures and Figure 4 13 4 14 4 15 4 16 and 4 17 1 Remove four 2 5x6 screws from the logic upper assembly Figure 4 13 Removing three screws from under the keyboard M2 5x6 4 ...

Page 150: ...ing cables and antennas from the logic upper assembly 3 Remove one LVDS cable from the motherboard 4 Take the cables and antennas from the left and right sides of the display hinge and move out of the way from the hinge screws NOTE When removing the hinge screws the cables and antennas on the left and right sides will be obstacles Be sure to move any cables securely out of the way to ensure no scr...

Page 151: ...acement Procedures NB250 NB255 Maintenance Manual 4 25 5 Close the laptop Remove two M2 5x6 screws from the hinge saddle as shown in Figure 4 15 Figure 4 15 Removing the first pair of screws from the hinge saddle M2 5x6 2 ...

Page 152: ...es 4 5 WLAN Card NB250 NB255 Maintenance Manual 4 26 6 Open the laptop and remove two M2 5x6 screws from the hinge saddle as shown in Figure 4 16 Figure 4 16 Removing the second pair of screws from the hinge saddle M2 5x6 2 ...

Page 153: ...oard 9 Lift up the logic upper assembly Installing the Logic Upper Assembly Install the logic upper assembly according to the following procedures 1 Seat the logic upper assembly to the front of the laptop and adjust to the correct position 2 Connect the Thermal Fan cable 3 To reconnect the touch pad cable use tweezers and a finger to push down on the left and right latches of the connector Both l...

Page 154: ... indicated in Figure 4 13 7 Route first the WLAN antennas through the trough and then pull through the slot to the underside of the computer 8 Route the camera cable and microphone cable through the trough and secure in the logic upper assembly with adhesive tape NOTE Take extra care in routing cables and antennas on Logic upper assembly Improperly routed cables can become pinched or damaged and c...

Page 155: ...as shown in Figure 4 18 2 Detach the speaker cable from the motherboard and remove the speaker from the logic lower assembly Figure 4 18 Removing the speaker Installing the Speaker Install the speaker according to the following procedures 1 Seat the speaker in the correct position on the logic lower assembly 2 Secure the speaker with two M2 5x7 7 screws 3 Attach the speaker cable to the motherboar...

Page 156: ...Remove two M2 5x2 5 screws from the touch pad bracket as shown in Figure 4 19 Figure 4 19 Removing the screws from the touch pad bracket 2 Remove the touch pad bracket from the logic upper assembly Installing the Touch Pad Bracket Install the touch pad bracket according to the following procedures 1 Seat the touch pad bracket in the correct position 2 Secure the bracket with two M2 5x2 5 screws M2...

Page 157: ...emoving the Motherboard Remove the motherboard according to the following procedures and Figure 4 20 4 21 4 22 and 4 23 1 Remove two M2 5x4 screws and FAN cable from the motherboard as indicated by the arrow in Figure 4 20 Figure 4 20 Removing the motherboard from logic lower assembly M2 5x4 2 ...

Page 158: ...ual 4 32 2 Remove the plate from the logic lower assembly Figure 4 21 Removing the DC IN plate 3 Gently pull the cable out of the routing channel in the logic lower assembly from right to left as shown in Figure 4 22 Figure 4 22 Removing the DC IN connector and cable ...

Page 159: ...dures NB250 NB255 Maintenance Manual 4 33 4 Use your hands to pick up the motherboard in the direction of the arrows as shown in figure 4 23 Figure 4 23 Picking up the motherboard 5 Remove the motherboard from the logic lower assembly ...

Page 160: ...es and Figures 4 24 and 4 25 1 Before seat the motherboard on the logic lower assembly pull out the any cables to avoid them being pressed 2 Align the connectors on the left side to their corresponding holes in the logic lower assembly as shown in Figure 4 24 Figure 4 24 Aligning the motherboard connectors 3 Seat the motherboard down in the lower logic assembly ...

Page 161: ...ower DC IN trough and route the cable from left to right under the ribs as shown in Figure 4 25 Fasten with tape Figure 4 25 Installing the DC IN connector 5 Seat the DC IN plate in its correct position 6 Secure two M2 5x4 screws and attach FAN cable to the motherboard as indicated by the arrow in Figure 4 20 ...

Page 162: ...eration Be sure to let it cool down before starting the repair work 2 Use care when removing and disassembling the unit in order to avoid damage 3 If you remove the thermal module please use a soft cloth with alcohol to clean the thermal fan module If you use a new module please make sure to remove any release paper first 1 Remove three M2 5x3 screws securing the thermal fan module to the motherbo...

Page 163: ... Apply a new thermal pad on the thermal fan module as shown in Figure 4 27 If you use a new thermal fan module remove any release papers on the thermal pads first Figure 4 27 Applying the thermal pad on the thermal module 2 Seat the thermal fan module in the correct position on the motherboard and secure it with three M2 5x3 screws in reverse order 3 2 1 of that shown in Figure 4 26 Thermal Pad ...

Page 164: ...ly Removing the LCD Bezel Assembly Remove the LCD bezel assembly according to the following procedures and Figures 4 28 4 29 and 4 30 1 Remove the two mask seals that cover the screws 2 Remove two M2 5x5 screws as shown in Figure 4 28 TOBSHIBA Figure 4 28 Removing screws from the LCD Bezel Assembly M2 5x5 2 ...

Page 165: ...des of the bezel are secured tightly Remove slowly and take extra caution to prevent your nails from becoming broken or from scratching the LCD surface 1 2 4 3 Figure 4 29 Removing the bezel from the hinge wall 4 Push the bezel from the left and right side as shown in Figure 4 30 and remove the bezel from the display assembly Figure 4 30 Removing the bezel from the display assembly ...

Page 166: ...s and antennas on the LCD module Improperly routed cables can become pinched or damaged and cause malfunction 1 Seat the LCD bezel assembly in the correct position 2 Press the bezel hinge wall against the cover hinge wall Press the left and right side of the bezel as shown in Figure 4 31 Make sure the bezel clicks into place 3 Secure it to the display assembly with two M2 5x5 screws 4 Adhere the t...

Page 167: ...4 31 and 4 32 1 Remove four M2 5x4 screws securing the LCD module to the LCD cover assembly 2 Pull up the camera from the LCD cover assembly without disconnecting it from the connector NOTE Camera module is fastened by adhesive tape Remove it slowly and carefully Figure 4 31 Removing the screws from the LCD module 3 Lift the LCD module out of the LCD cover assembly and remove it M2 5x5 4 ...

Page 168: ...e LCD panel and then remove the LCD hinge assembly as shown in Figure 4 32 Figure 4 32 Removing the LCD Hinge Assembly NOTE Integrated Circuits ICs are fragile Use extreme care not to apply pressure to the ICs along the edges of the LCD module Dispose of used LCD panels fluorescent FL tubes as required by local ordinances or regulations M2x3 4 ...

Page 169: ...stall the LCD module according to the following procedures 1 Seat the LCD hinges in the correct positions on the LCD panel and secure them with four M2x3 screws 2 Seat the LCD module in the correct position in the LCD cover assembly 3 Secure the LCD module to the LCD cover assembly with four M2 5x4 screws ...

Page 170: ...ule and LVDS Cable Remove the Camera module and LVDS cable according to the following procedures and Figures 4 33 and 4 34 1 Turn the LCD panel over and place it face down on a protective surface such as a foam pad 2 Disconnect the camera from the connector and remove it as shown in Figure 4 33 Figure 4 33 Removing the Camera from the LCD panel ...

Page 171: ...anual 4 45 3 Carefully peel up the LVDS cable starting from the top as shown in Figure 4 34 Once the LVDS cable has been peeled up disconnect it from the LCD panel taking care not to damage the connector Remove the LVDS cable Figure 4 34 Removing the LVDS cable from the LCD module ...

Page 172: ...rding to the following procedures NOTE Take extra care in routing cables and antennas on the LCD module Improperly routed cables can become pinched or damaged and cause malfunction 1 Connect the LVDS cable to the connector on the back of the LCD module 2 Adhere the LVDS cable in the correct position on the LCD module 3 Connect the camera to the camera connector on the LVDS cable ...

Page 173: ...make sure that you seat it so that it is properly aligned and maximum visibility of the display is maintained 2 Be careful to align the holes at the four corners of the LCD module with the corresponding holes in the LCD cover before securing the module with screws Do not force the module into place because stress can affect its performance Note The panel s polarized surface is easily scratched and...

Page 174: ...rface is very dirty we recommend a CRT cleaning agent Apply the agent to a soft cloth and then wipe the panel s surface Do not apply cleanser directly to the panel CRT Cleaner 4 If water or other liquid is left on the panel s surface for a long period it can change the screen s tint or stain it Be sure to quickly wipe off any liquid A 2 CONFIDENTIAL NB250 NB255 Series Maintenance Manual ...

Page 175: ...ke a hard object which could cause breakage or cracks 6 CMOS LSI circuits are used in the module so guard against damage from electrostatic discharge Be sure to wear a wrist or ankle grounding device when handling the module NB250 Series Maintenance Manual CONFIDENTIAL A 3 ...

Page 176: ...ds 8 Do not store the module at temperatures below its specifications Cold can cause the liquid crystals to freeze lose their elasticity or otherwise suffer damage 9 Do not disassemble the LCD module Disassembly can cause malfunctions A 4 CONFIDENTIAL NB250 NB255 Series Maintenance Manual ...

Page 177: ...e module do not use packing material that contains epoxy resin amine or silicon glue alcohol or oxime These materials can release gas that can damage the panel s polarization NB250 Series Maintenance Manual CONFIDENTIAL A 5 ...

Page 178: ...dix B Appendix B Board Layout B 1 System Board Top View JLVDS JPOWER JMIC JKB U35 U36 U4 JCARD JFAN JTOUCH U29 JSPKR Figure B 1 System Board Layout Top NB250 NB255 Series Maintenance Manual CONFIDENTIAL B 1 ...

Page 179: ...tem Board Bottom View Figure B 2 System Board Layout Bottom JWLAN UL3 UL1 UC1 U15 JLAN JLINE JEXMIC JCRT U2 PJP2 UA2 JDDR1 JSATA PJP1 U1 JUSBC JUSBB JUSBA B 2 CONFIDENTIAL NB250 NB255 Series Maintenance Manual ...

Page 180: ...M875N 397 GR U15 South Bridge_Intel NM10 U29 EC_KB926QFE0 U35 FAN Control IC_APL5607KI TRG U36 BIOS ROM UA2 Codec_ALC259 VB5 GR UC1 Card Reader_RTS5138 GR UL1 10 100 LAN_RTL8105E GR UL3 LAN Transformer_S X FORM_ NS681695 Table B 2 System Board Connectors top and bottom NB250 Series Maintenance Manual CONFIDENTIAL B 3 ...

Page 181: ...CRT CRT conn JPOWER Power B conn JSATA SATA HDD conn JCARD Card Reader conn JMIC Microphone conn JSPKR Speaker conn JLAN LAN conn JWLAN WLAN conn JUSBA USB A conn JUSBB USB B conn JUSBC USB C conn JLINE Headphones conn JEXMIC External MIC conn JKB Keyboard conn JTOUCH TP B conn PJP1 AC Adaptor conn PJP2 Battery conn ...

Page 182: ...S Table C 2 LVDS I F pin assignments 20 pin Pin No Signal name I O Pin No Signal Name I O 1 LEDVDD 2 NC 3 LCDVDD_L 4 3VS 5 LCD_PWM 6 BKOFF 7 LVDS_SDA 8 LVDS_SCL 9 GND 10 LVDS_A0 11 LVDS_A0 12 GND 13 LVDS_A1 14 LVDS_A1 15 GND 16 LVDS_A2 17 LVDS_A2 18 GND 19 LVDS_ACLK 20 LVDS_ACLK 21 GND 22 USB_N7_R 23 USB_P7_R 24 5VS NB250 NB255 Series Maintenance Manual CONFIDENTIAL C 1 ...

Page 183: ..._DAT 13 HSYNC 14 VSYNC 15 CRT_DDC_CLK C 4 JSATA Table C 4 HDD I F pin assignments 22 pin Pin No Signal name I O Pin No Signal Name I O 1 GND 2 SATA_ITX_C_ DRX_P0 3 SATA_ITX_C_ DRX_N0 4 GND 5 SATA_IRX_DT X_N0 6 SATA_IRX_DT X_P0 7 GND 8 3VS 9 3VS 10 3VS 11 GND 12 GND 13 GND 14 5VS 15 5VS 16 5VS 17 GND 18 NC 19 GND 20 NC 21 NC 22 NC C 2 CONFIDENTIAL NB250 NB255 Series Maintenance Manual ...

Page 184: ... LPC_AD1_R 15 GND 16 LPC_AD0_R 17 NC 18 GND 19 NC 20 XMIT_OFF 21 GND 22 PLT_RST 23 PCIE_PTX_C_IRX_N 2 24 3V_WLAN 25 PCIE_PTX_C_IRX_P 2 26 GND 27 GND 28 1 5VS 29 GND 30 CLK_SMBCLK 31 PCIE_ITX_C_PRX_N 2 32 CLK_SMBDATA 33 PCIE_ITX_C_PRX_P 2 34 GND 35 GND 36 USB20_N4 37 GND 38 USB20_P4 39 3V_WLAN 40 GND 41 3V_WLAN 42 LED_WIMAX 43 GND 44 NC 45 NC 46 NC 47 NC 48 1 5VS 49 EC_TX_P80_DATA 50 GND 51 EC_RX_P...

Page 185: ...12 pin Pin No Signal name I O Pin No Signal Name I O 1 RJ45_MIDI0 I O 2 RJ45_MIDI0 I O 3 RJ45_MIDI1 I O 4 NC 5 NC 6 RJ45_MIDI1 I O 7 NC 8 NC 9 3V_LAN 10 LAN_SK_LAN_LINK 11 3V_LAN 12 LAN_ ACTIVITY C 4 CONFIDENTIAL NB250 NB255 Series Maintenance Manual ...

Page 186: ...5 DDR_A_D0 6 DDR_A_D5 7 DDR_A_D1 8 GND 9 GND 10 DDR_A_DQS 0 11 DDR_A_DM0 12 DDR_A_DQS0 13 GND 14 GND 15 DDR_A_D2 16 DDR_A_D6 17 DDR_A_D3 18 DDR_A_D7 19 GND 20 GND 21 DDR_A_D8 22 DDR_A_D12 23 DDR_A_D9 24 DDR_A_D13 25 GND 26 GND 27 DDR_A_DQS 1 28 DDR_A_DM1 29 DDR_A_DQS1 30 DRAMRST 31 GND 32 GND NB250 Series Maintenance Manual CONFIDENTIAL C 5 ...

Page 187: ..._A_D19 54 GND 55 GND 56 DDR_A_D28 57 DDR_A_D24 58 DDR_A_D29 59 DDR_A_D25 60 GND 61 GND 62 DDR_A_DQS 3 63 DDR_A_DM3 64 DDR_A_DQS3 65 GND 66 GND 67 DDR_A_D26 68 DDR_A_D30 69 DDR_A_D27 70 DDR_A_D31 71 GND 72 GND 73 DDR_CKE0 74 DDR_CKE1_DI MMA 75 1 5V 76 1 5V 77 NC 78 NC 79 DDR_A_BS2 80 DDR_A_MA14 81 1 5V 82 1 5V 83 DDR_A_MA12 84 DDR_A_MA11 85 DDR_A_MA9 86 DDR_A_MA7 87 1 5V 88 1 5V 89 DDR_A_MA8 90 DDR...

Page 188: ...M_ODT0 117 1 5V 118 1 5V 119 DDR_A_MA13 120 M_ODT1 121 DDR_CS1_DIM MA 122 NC 123 1 5V 124 1 5V 125 NC 126 VREF_CA 127 GND 128 GND 129 DDR_A_D32 130 DDR_A_D36 131 DDR_A_D33 132 DDR_A_D37 133 GND 134 GND 135 DDR_A_DQS 4 136 DDR_A_DM4 137 DDR_A_DQS4 138 GND 139 GND 140 DDR_A_D38 141 DDR_A_D34 142 DDR_A_D39 143 DDR_A_D35 144 GND 145 GND 146 DDR_A_D44 147 DDR_A_D40 148 DDR_A_D45 149 DDR_A_D41 150 GND 1...

Page 189: ...R_A_DQS6 172 GND 173 GND 174 DDR_A_D54 175 DDR_A_D50 176 DDR_A_D55 177 DDR_A_D51 178 GND 179 GND 180 DDR_A_D60 181 DDR_A_D56 182 DDR_A_D61 183 DDR_A_D57 184 GND 185 GND 186 DDR_A_DQS 7 187 DDR_A_DM7 188 DDR_A_DQS7 189 GND 190 GND 191 DDR_A_D58 192 DDR_A_D62 193 DDR_A_D59 194 DDR_A_D63 195 GND 196 GND 197 GND 198 PM_EXTTS 0 199 3VS 200 CLK_SMBDATA 201 GND 202 CLK_SMBCLK 203 0 75VS 204 0 75VS C 8 CO...

Page 190: ...I O 1 AGND 2 HP_L_R 3 HP_R_R 4 NBA_PLUG 5 AGND 6 NC C 10 JKB Table C 10 Keyboard Connector pin assignments 34 pin Pin No Signal name I O Pin No Signal Name I O 1 NC 2 NC 3 CAPS_LED 4 3VS 5 KSI1 6 KSI6 7 KSI5 8 KSI0 9 KSI4 10 KSI3 11 KSI2 12 KSI7 13 KSO15 14 KSO12 15 KSO11 16 KSO10 17 KSO9 18 KSO8 19 KSO13 20 KSO7 21 KSO6 22 KSO14 23 KSO5 24 KSO3 25 KSO4 26 KSO0 27 KSO1 28 KSO2 29 NC 30 NC NB250 Se...

Page 191: ...ignal name I O Pin No Signal Name I O 1 USB_VCCA 2 USB20_N1_R 3 USB20_P1_R 4 GND C 13 JUSBC Table C 13 USB B Connector pin assignments 4 pin Pin No Signal name I O Pin No Signal Name I O 1 USB_VCCB 2 USB20_N4_R 3 USB20_P4_R 4 GND C 14 JPOWER Table C 14 POWER B connector pin assignments 4 pin Pin No Signal name I O Pin No Signal Name I O 1 PWR_ON_LED 2 PWR_ON_LED 3 ON OFFBTN _R 4 GND C 10 CONFIDENT...

Page 192: ...TA0 8 SD_DATA1 9 SD_DATA2 10 SDWP 11 SDCD C 16 JEXMIC Table C 16 EXMIC connector pin assignments 6 pin Pin No Signal name I O Pin No Signal Name I O 1 AGND 2 MIC1_L_L 3 MIC1_L_R 4 MIC_SENSE 5 AGND 6 NC C 17 JSPKR Table C 17 SPKR connector pin assignments 2 pin Pin No Signal name I O Pin No Signal Name I O 1 SPK_R1 2 SPK_R2 NB250 Series Maintenance Manual CONFIDENTIAL C 11 ...

Page 193: ... CONFIDENTIAL NB250 NB255 Series Maintenance Manual C 18 JTOUCH Table C 18 T P connector pin assignments 6 pin Pin No Signal name I O Pin No Signal Name I O 1 GND 2 TP_SWR 3 TP_SWL 4 TP_DATA 5 TP_CLK 6 5VS ...

Page 194: ...7 87 36 F0 36 08 7 08 88 3D F0 3D 2 09 8 09 89 3E F0 3E 2 10 9 0A 8A 46 F0 46 2 11 0 0B 8B 45 F0 45 12 _ 0C 8C 4E F0 4E 13 0D 8D 55 F0 55 15 BkSp 0E 8E 66 F0 66 16 Tab 0F 8F 0D F0 0D 17 Q 10 90 15 F0 15 18 W 11 91 1D F0 1D 19 E 12 92 24 F0 24 20 R 13 93 2D F0 2D 21 T 14 94 2C F0 2C 22 Y 15 95 35 F0 35 23 U 16 96 3C F0 3C 2 24 I 17 97 43 F0 43 2 25 O 18 98 44 F0 44 2 26 P 19 99 4D F0 4D 2 27 1A 9A ...

Page 195: ...33 37 J 24 A4 3B F0 3B 2 38 K 25 A5 42 F0 42 2 39 L 26 A6 4B F0 4B 2 40 27 A7 4C F0 4C 2 41 28 A8 52 F0 52 43 Enter 1C 9C 5A F0 5A 3 44 Shift L 2A AA 12 F0 12 45 No 102 key 56 D6 61 F0 61 46 Z 2C AC 1A F0 1A 47 X 2D AD 22 F0 22 48 C 2E AE 21 F0 21 49 V 2F AF 2A F0 2A 50 B 30 B0 32 F0 32 51 N 31 B1 31 F0 31 52 M 32 B2 3A F0 3A 2 53 33 B3 41 F0 41 2 54 34 B4 49 F0 49 2 55 35 B5 4A F0 4A 2 57 Shift R...

Page 196: ...E0 F0 6B 1 80 Home E0 47 E0 C7 E0 6C E0 F0 6C 3 81 End E0 4F E0 CF E0 69 E0 F0 69 3 83 E0 48 E0 C8 E0 75 E0 F0 75 1 84 E0 50 E0 D0 E0 72 E0 F0 72 1 85 PgUp E0 49 E0 C9 E0 7D E0 F0 7D 1 86 PgDn E0 51 E0 D1 E0 7A E0 F0 7A 1 89 E0 4D E0 CD E0 74 E0 F0 74 1 110 Esc 01 81 76 F0 76 112 F1 3B BB 05 F0 05 113 F2 3C BC 06 F0 06 114 F3 3D BD 04 F0 04 115 F4 3E BE 0C F0 0C 116 F5 3F BF 03 F0 03 117 F6 40 C0 ...

Page 197: ...E0 F0 1F x App E0 5D E0 DD E0 2F E0 F0 2F Notes 1 Scan codes differ by mode 2 Scan codes differ by overlay function 3 Combination with the Fn key gives different codes 4 The Fn key does not generate a code by itself 5 This key corresponds to key No 42 in a 102 key model 6 Refer to Table D 6 No 124 key scan code 7 Refer to Table D 7 No 126 key scan code D 4 CONFIDENTIAL NB250 NB255 Series Maintenan...

Page 198: ...0 F0 75 E0 12 84 E0 AA E0 50 E0 D0 E0 2A E0 F0 12 E0 72 E0 F0 72 E0 12 85 PgUp E0 AA E0 49 E0 C9 E0 2A E0 F0 12 E0 7D E0 F0 7D E0 12 86 PgDn E0 AA E0 51 E0 D1 E0 2A E0 F0 12 E0 7A E0 F0 7A E0 12 89 E0 AA E0 4D E0 CD E0 2A E0 F0 12 E0 74 E0 F0 74 E0 12 X Win E0 AA E0 5B E0 DB E0 2A E0 F0 12 E0 1F E0 F0 1F E0 12 X App E0 AA E0 5D E0 DD E0 2A E0 F0 12 E0 2F E0 F0 2F E0 12 Note The table above shows s...

Page 199: ...F0 12 85 PgUp E0 2A E0 49 E0 C9 E0 AA E0 12 E0 7D E0 F0 7D E0 F0 12 86 PgDn E0 2A E0 51 E0 D1 E0 AA E0 12 E0 7A E0 F0 7A E0 F0 12 89 E0 2A E0 4D E0 CD E0 AA E0 12 E0 74 E0 F0 74 E0 F0 12 X Win E0 2A E0 5B E0 DB E0 AA E0 12 E0 1F E0 F0 1F E0 F0 12 X App E0 2A E0 5D E0 DD E0 AA E0 12 E0 2F E0 F0 2F E0 F0 12 Table D 4 Scan codes with Fn key Code set 1 Code set 2 Cap No Keytop Make Break Make Break 43...

Page 200: ...B 37 J 1 4F CF 69 F0 69 38 K 2 50 D0 72 F0 72 39 L 3 51 D1 7A F0 7A 40 4E CE 79 F0 79 52 M 0 52 D2 70 F0 70 54 53 D3 71 F0 71 55 E0 35 E0 B5 E0 4A E0 F0 4A Table D 6 No 124 key scan code Code set 1 Code set 2 Key top Shift Make Break Make Break Prt Sc Common E0 2A E0 37 E0 B7 E0 AA E0 12 E0 7C E0 F0 7C E0 F0 12 Ctrl E0 37 E0 B7 E0 7C E0 F0 7C Shift E0 37 E0 B7 E0 7C E0 F0 7C Alt 54 D4 84 F0 84 NB2...

Page 201: ...eries Maintenance Manual Table D 7 No 126 key scan code Code set 1 Code set 2 Key top Shift Make Make Pause Common E1 1D 45 E1 9D C5 E1 14 77 E1 F0 14 F0 77 Break Common E0 46 E0 C6 E0 7E E0 F0 7E This key generates only make codes ...

Page 202: ...Appendix E Key Layout 1 United Status US Keyboard Figure US keyboard 2 Traditional Chinese CH Keyboard Figure CH keyboard NB250 NB255 Series Maintenance Manual ...

Page 203: ...3 Thai TI Keyboard Figure TI keyboard 4 Korean KO Keyboard Figure KO keyboard NB250 NB255 Series Maintenance Manual ...

Page 204: ...5 United Kingdom UK Keyboard Figure UK keyboard 6 US International UI Keyboard NB250 NB255 Series Maintenance Manual ...

Page 205: ...Figure UI keyboard 7 Hebrew HB Keyboard Figure HB keyboard 8 Danish DM Keyboard NB250 NB255 Series Maintenance Manual ...

Page 206: ...Figure DM keyboard 9 Swiss SW Keyboard Figure SW keyboard NB250 NB255 Series Maintenance Manual ...

Page 207: ...10 Arabic ARE Keyboard Figure ARE keyboard 11 Czech CZ Keyboard Figure CZ keyboard NB250 NB255 Series Maintenance Manual ...

Page 208: ...NB250 NB255 Series Maintenance Manual 2 Russian RU Keyboard 1 Figure RU keyboard 3 Portuguese PO Keyboard 1 Figure PO keyboard ...

Page 209: ...NB250 NB255 Series Maintenance Manual 4 Slovakian SL Keyboard 1 Figure SL keyboard 5 Italian IT Keyboard 1 Figure IT keyboard ...

Page 210: ...NB250 NB255 Series Maintenance Manual 16 French FR Keyboard Figure FR keyboard 17 German GR Keyboard Figure GR keyboard ...

Page 211: ...NB250 NB255 Series Maintenance Manual 18 Greek GK Keyboard Figure GK keyboard 19 Hungarian HG Keyboard ...

Page 212: ...NB250 NB255 Series Maintenance Manual Figure HG keyboard 20 Spanish SP Keyboard Figure SP keyboard 21 Turkish TR Keyboard ...

Page 213: ...Figure TR keyboard 22 Turkish F TF F Keyboard Figure TF F keyboard NB250 NB255 Series Maintenance Manual ...

Page 214: ...23 Swedish SD Keyboard Figure SD keyboard 24 Belgian BE Keyboard Figure BE keyboard NB250 NB255 Series Maintenance Manual ...

Page 215: ...25 Yugoslavian YU Keyboard Figure YU keyboard 26 Norwegian NW Keyboard Figure NW keyboard NB250 NB255 Series Maintenance Manual ...

Page 216: ...27 Scandinavian ND Keyboard Figure ND keyboard 28 Canadian Multinational AC Keyboard NB250 NB255 Series Maintenance Manual ...

Page 217: ...Figure AC keyboard 29 Canadian Bilingual CB Keyboard Figure CB keyboard 30 Romania RO Keyboard NB250 NB255 Series Maintenance Manual ...

Page 218: ...NB250 NB255 Series Maintenance Manual Figure RO keyboard 31 Bulgaria BU Keyboard Figure BU keyboard 32 Japanese JP Keyboard ...

Page 219: ...Figure JP keyboard NB250 NB255 Series Maintenance Manual ...

Page 220: ...RMAL MODULE MA000005WG0 M2 5x3 black 3 THERMAL MODULE TO MB 2 0 2 5Kgf cm HDD ASSY MCDK03030G0 M3x3 BZn 黑鎳 4 HDD BRACKET TO HDD 2 0 2 5Kgf cm LOG UP MAC925025G0 M2 5x2 5 black 2 TP BRACKET TO LOG UP 2 0 2 5Kgf cm LOG LOWER ASSY MA000009KG0 SPEAKER SCREW 2 SPEAKER TO LOG LOW 2 5 2 5Kgf cm LOGIC ASSY MACK25040G0 M2 5x4 Black 2 MB TO LOG LOW 2 0 2 5Kgf cm MACK25040G0 M2 5x4 Black 2 LOG LOW To LOG UP ...

Page 221: ...F 2 CONFIDENTIAL NB250 Series Maintenance Manual LOGIC LCD ASSY MA0000062G0 M2 5x6 Black 4 HINGE BRACKET TO LOGIC 2 0 2 5Kgf cm MACK25040G0 M2 5x4 Black 3 LOG LOW TO UP HINGE COVER 2 0 2 5Kgf cm ...

Page 222: ...owing table shows MTBF Mean Time Between Failures for each component Table G 1 MTBF Component Time hours LCD 10 000 Keyboard 64400 HDD 300 000 Optical DVD CD drive 60 000 AC adaptor 50 000 NB250 NB255 Series Maintenance Manual CONFIDENTIAL G 1 ...

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