Samsung 920NW - SyncMaster - 19" LCD Monitor Service Manual Download Page 20 | Manualshive

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4 Troubleshooting

4-3

4-3 Output power is unstable

Check sampling

Circuit

Check the R pin

voltage of IC803

about 2.5V

Check pin1 of

IC802 voltage is

5.8V

Check pin1 of
IC802 voltage

about 3V

Check R818, D804,

C807 if short

Check the C pin

voltage of IC803 if

3V

Check R822, R823,

R824

Unstable power

Change R822, R823,

R824

Change IC803

Check R819, R820

END

Change R818

Change R808, R809,

R810, R811

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Summary of Contents for 920NW - SyncMaster - 19" LCD Monitor

Page 1: ...SERVICE Manual LCD Monitor Fashion Feature LCD Monitor Model 920NW 19 LCD Monitor 1440x 900 Response Time 5ms Simple Stand Silver Black ColorVariation ...

Page 2: ...without prior written permission of Samsung Electronics Co Ltd 920NW Service Manual First edition July 20067 Printed in Korea Trademarks Samsung is the registered trademark of Samsung Electronics Co Ltd 920NW and MacMaster Cable Adapter are trademarks of Samsung Electronics Co Ltd Macintosh Power Macintosh are trademarks of Apple Computer Inc All other trademarks are the property of their respecti...

Page 3: ...DID Data Input 3 1 3 4 How to execute DDC 3 2 3 5 How to execute MCU Code 3 3 4 4 Troubleshooting 4 4 1 4 1 Common Acknowledge 4 1 4 2 No Power Power LED Off 4 2 4 3 DC output voltage is unstable 4 3 4 4 Output power is unstable 4 4 4 5 Backlight can t be turned on 4 5 4 6 Black Screen and backlight turn on 4 6 4 7 White Screen 4 7 4 8 Bad Screen 4 8 5 5 Exploded View and Parts List 5 5 1 6 E Elec...

Page 4: ...ing a Base 10 4 1 11 Disassembly and Reassembly 1 11 1 11 1 Disassembly Block 11 1 11 2 Reassembly 11 4 1 12 PCB Diagram 1 12 1 13 C Circuit Descriptions 1 13 1 13 1 Overall Block Structure 13 1 13 2 IP BOARD part Inverter Part 13 4 1 14 Reference Infomation 14 1 14 1 Technical Terms 14 1 14 2 Connecting the monitor 14 3 14 3 Pin Assignments 14 4 14 4 Timing Chart 14 5 14 5 Preset Timing Modes 14 ...

Page 5: ...Suwon City Gyeonggi Do Korea 443 742 Printed in Korea P N BN82 URL http itself sec samsung co kr This Service Manual is a property of Samsung Electronics Co Ltd Any unauthorized use of Manual can be punished under applicable International and or domestic law ...

Page 6: ...pliances and Underwriters Laboratories UL Publication UL1410 59 7 Figure 1 1 Leakage Current Test Circuit 4 With the unit completely reassembled plug the AC line cord directly into a 120V AC outlet With the unit s AC switch first in the ON position and then OFF measure the current between a known earth ground metal water pipe conduit etc and all exposed metal parts including metal cabinets screwhe...

Page 7: ...ord from the AC source and turn the power switch ON Connect an insulation resistance meter 500 V to the blades of the AC plug The insulation resistance between each blade of the AC plug and accessible conductive parts see above should be greater than 1 megohm 6 Always connect a test instrument s ground lead to the instrument chassis ground before connecting the positive lead always remove the inst...

Page 8: ...ct it from being exposed to moisture Otherwise it may cause a fire or electric shock 5 Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product Also check the antenna cable or the external connectors if they are fully unplugged Damage to the cord may cause fire or electric shock 6 Keep the antenna far away from any high voltage cables and install i...

Page 9: ...1 Precautions 1 4 Memo ...

Page 10: ...30 81 kHz 56 75 Hz Bandwidth MHz 140MHz Resolution 1440 x 900 60Hz Color Sliver Black Signal Input Sync Type Separate Composite No Sync On Green Video Input Analog Signal Level Power Consumption Max 36 W Power saving 1W Stand Yes Swivel left right NO Power Supply AC 100 240 VAC 10 60 50 Hz 3 Hz Dimension W x D x H 439 006 x 289 006 x 65 45 mm3 Without Stand 439 006x355 452x81 12 mm3 With Simple St...

Page 11: ...2 Product Specifications 2 2 2 3 Option Specification Item Item Name CODE NO Remark GUIDE QUICK SETUP BH68 00376L 04 BN59 00537A 00 N A MNL User s CD D Sub Cable BH68 70438A 10 CARS WARRANTY ...

Page 12: ...and XGA mode recommend 1 Push the OSD Menu button to open the OSD 2 Selectl language English 3 Push enter button during 5 seconds 4 See the screen flashing 3 3 DDC EDID Data Input 1 Input DDC EDID data when replacing AD PCB 2 Receive Download the proper DDC file for the model from HQ quality control department Install the below jig Figure 1 and enter the data 3 Alignments and Adjustments This sect...

Page 13: ...me SAM 4C 2D 0A 0B Product ID Code 022B 2B 02 0C 0F Last 5 Digits of Serial Number Used Notes1 XX XX XX XX 10 Week of Manufacture Notes2 XX 11 Year of Manufacture Notes3 XX 12 EDID Version Number 1 01 13 EDID Revision Number 3 03 14 Video Input Definition Analog Signal 6C 0 700 0 000 0 700Vpp Separate Sync Composite Sync 15 Max Horizontal Image Size cm 34 22 16 Max Vertical Image Size cm 27 1B 17 ...

Page 14: ...4F 81 80 1152x864 75Hz 81 40 1280x960 60Hz 01 01 Not Used 01 01 Not Used 01 01 Not Used 01 01 Not Used 01 01 Not Used 36 47 18 byte Detailed Timing 1280X1024 60HZ 30 2A 00 98 Descriptor Block 1 Pixel Clock 108 00MHZ 51 00 2A 40 30 70 13 00 52 0E 11 00 00 1E 48 59 18 byte Detailed Timing Descriptor Monitor Range Limits Block 2 Min Vertical Freq 56 Hz 38 Max Vertical Freq 75 Hz Min Horiz Freq 30 KHz...

Page 15: ...rogram 2 Click the Analog DVI EDID Tool icon 3 Select mode The password is 1234 Select the manufacture is Venus and the model name is Venus 17 4 Setting The password is 1234 Select the port1and the SN Leng is 22 Save the change 5 Select Write Auto Write The SN number is a 22 random numbers ...

Page 16: ...the options Manufacture MSTAR Device Type TSUM16_ROM128K_ext_flash Communication Port DSUB15 Analog External Memory PM25LV010E 2 Click Connect File button and select the MCU code 3 Click Read File button and select the MCU code 3 5 How to execute MCU Code ...

Page 17: ...3 Alignments and Adjustments 3 6 4 Click Auto Program button 5 If Program and Verify is OK turn off the hard power and than turn on again ...

Page 18: ...mal or not please do it under 16 grey scalar pattern This LCM is analog interface So if the entire screen is an abnormal color that means the problem happen in the analog circuit part if only some scale appears abnormal color that stand the problem happen in the digital circuit part If you check the H V position please use the crosshatch pattern This LCM support more than 30 timing modes if the in...

Page 19: ... IC802 voltage about 12V Check pin2 of IC802 voltage about 3V Check pin1 of IC802 voltage is voltage is below 1V Check circuit if short No power Check IC802 C805 T801 Check F801 P801 RT 801 D801 Check C810 D803 C807 Check primary OVP OLP and secondary feedback Check R811 R810 R809 R808 R814 END ...

Page 20: ...age of IC803 about 2 5V Check pin1 of IC802 voltage is 5 8V Check pin1 of IC802 voltage about 3V Check R818 D804 C807 if short Check the C pin voltage of IC803 if 3V Check R822 R823 R824 Unstable power Change R822 R823 R824 Change IC803 Check R819 R820 END Change R818 Change R808 R809 R810 R811 ...

Page 21: ...es Yes No Is there PWM signal on pin 4 of IC501 Check I F BD No Yes Is there High level voltage on pin10 of IC501 Check I F BD No Yes Vsense voltage 2 9V Lamp connector opened No No Are there PWM signal on pin1 pin15 of IC501 IC501 failure No Yes Pin 5 of IC501 voltage is Low level Feedback circuit failure Yes Check C524 R528 R533 D507 Yes Yes Pin 3 of IC501 voltage is high level voltage IC501 pro...

Page 22: ...1 66 and 82 Of U105 Check FB103 And U102 No Yes Check pin12 68 97 and 117 Of U103 Check FB105 And U106 No Yes Check Reset pin19 Of U103 Check C149 R157 No Yes Check Crystal Pin32 Pin33 Of U103 Check X1 C147 C148 Inverter Fail MCU Fail Check R127 Q101 R125 R126 No Yes Check CCFL Enable pin20 of U103 Check pin5 of CN102 Yes No No Yes Yes ...

Page 23: ... Workmanship Yes Change LVDS Cable LVDS Cable NG Panel Fail Check C149 R157 END Yes Yes Yes No No No No Check VLCD Is 5V Check LVDS Signals No Yes Check Panel Enable Of U103 pin75 is High Check the HW Reset Of U103 pin19 No Check R134 R176 Q102 Q105 Check the pins Of U103 ...

Page 24: ...n LVDS Cable Reinsert Workmanship Yes Change LVDS Cable LVDS Cable NG Yes No Check Crystal Pin32 Pin33 of U103 Check X1 C147 C148 Yes No Check the communication Of U103 and U104 Check SDO SCZ SCK SDI Reset Check the pins of U103 and U104 No Yes Yes ...

Page 25: ...Memo 4 Troubleshooting 4 8 ...

Page 26: ... Exploded View Parts List 5 1 5 Exploded View and Parts List You can search for updated part codes through ITSELF web site URL http itself sec samsung co kr 5 1 Exploded View M0215 7140200053 7140100097 ...

Page 27: ...ts List Location No CODE NO SPECIFICATION DESCRIPTION Q TY SA SNA REMARK M0215 BN07 00406A LCD PANEL MT190AWO1 V2 Haydn 6bit FRC 42 1 S A 7140200053 BN82 00152A A S MATERIAL ASSY BASE LE1729 1 S A 7140100097 BN82 00188B A S MATERIAL ASSY STAND LE1961 1 S A ...

Page 28: ...06 1 S A 0 1 4530708001 BN81 00549A A S PWR CORD BLK 6FT UL CSA 10A 125V 453 1 S A 0 1 4303030009 BN81 00550A A S HRN LVDS 30P 120mm ROHS 430303000920 1 S A 0 1 7030000059 BN81 00551A A S KIT ACCESSORY 920NW US LE1961 703000 1 S A 0 1 4303008002 BN81 00555A A S HRN ASS Y 2 4P to 5P 265mm UL1571 28 1 S A 0 1 7140200053 BN82 00152A A S MATERIAL ASSY BASE LE1729 1 S A 0 1 7140500095 BN82 00188A A S M...

Page 29: ...6 Electrical Parts List 6 2 Memo ...

Page 30: ...7 Block Diagrams 7 1 7 Block Diagram 7 1 Power tree ...

Page 31: ...7 Block Diagrams 7 2 7 2 Main Board part 7 3 IP Board Part Power part ...

Page 32: ... part Inverter Part Vin voltage 14 2V Brightness control signal CCFL PWM Control IC IC501 DC to DC 14 2V to 5 0V MosFET U501 Transformer T501 CCFL1 CCFL1 CCFL2 CCFL2 Transformer T502 Voltage feedback Current feedback MosFET U502 ON OFF ...

Page 33: ...Memo 7 Block Diagrams 7 4 ...

Page 34: ...8 Wiring Diagram 8 1 8 Block Diagram ...

Page 35: ...Memo 8 Wiring Diagram 8 2 ...

Page 36: ...9 Schematic Diagrams 9 1 9 Schematic Diagrams This Document can not be used without Samsung s authorization 9 1 INPUT ...

Page 37: ...9 Schematic Diagrams 9 2 9 2 DCINPUT ...

Page 38: ...9 Schematic Diagrams 9 3 9 3 SCALER ...

Page 39: ...9 Schematic Diagrams 9 4 9 4 POWER ...

Page 40: ...9 Schematic Diagrams 9 5 9 5 POWER ...

Page 41: ...9 Schematic Diagrams 9 6 9 6 KEYPAD ...

Page 42: ...ur engineers the pre configured values may not be comfortable to your eyes depending on your taste If this is the case adjust the brightness and con trast by using the OSD menu 2 Text Normal brightness For documentations or works involving heavy text 3 Internet Medium brightness For working with a mixture of images such as text and graphics 4 Entertain For watching motion pictures such as a DVD or...

Page 43: ... cable to the 15 pin D sub connector on the back of your monitor 3 Power on off Switch option Use this button for turn the monitor on and off 4 Kensington Lock The Kensington lock is a device used to physically fix the system when using it in a public place The locking device has to be purchased separately To get the information on using the Kensington Lock contact an aurhorized dealer 1 2 4 3 ...

Page 44: ...the D sub Analog connector on the video card Connect the signal cable to the 15 pin D sub connector on the back of your monitor 2 2 Connected to a Macintosh Connect the monitor to the Macintosh computer using the D SUB connection cable 2 3 In the case of an old model Macintosh you need to connect the monitor using a special Mac adapter 3 Turn on your computer and monitor If your monitor displays a...

Page 45: ...10 Operating Instructions and Installation 10 4 10 4 Monitor Assembly ...

Page 46: ...onitor face down on a flat surface with a cushion beneath it to protect the screen 3 Remove four screws and then remove the stand from the LCD monitor 4 Align the mounting interface Pad with the holes in the rear cover mounting pad and secure it with four screws that came with the arm type base wall mount hanger or other base 10 5 Attaching a Base ...

Page 47: ...Memo 10 Operating Instructions and Installation 10 6 ...

Page 48: ...SCREW M4 10 4 BACK COVER BKT VESA 4 ASSY FRONT BEZEL STAND_REAR 1 HINGE 1 SCREW M4 10 3 LENS 1 CONTROL BOARD 1 STAND_FRONT 1 BEZEL 1 BUTTON FUNCTION 1 ASSY PANEL 1 SCREW M3 5 4 CABLE 30P FFC BOLT 4 40 11 8 Ni 2 CHASSIS 1 PCBA I F BOARD 1 Power Board 1 SCREW M3 6 CLIP WIRE 1 SHIELING 1 Note The DIS assembly direction please following direction of arrowhead INNOLUX PANEL EN01 ...

Page 49: ...11 Disassembly and Reassembly 11 2 2 Remove the stand and front coler Description Picture Description 1 Remove 4 screw from the stand ...

Page 50: ...11 Disassembly and Reassembly 11 3 4 Disconnect cables 5 Lift up the shield and disconnect LVDS cables Description Picture Description 3 Lift the back cover and use the jig to remove the shield lamp ...

Page 51: ...11 Disassembly and Reassembly 11 4 설 설 명 사 사진 설명 Description Picture Description 6 Lift up the LCD panel 11 2 Reassembly Reassembly procedures are in the reverse order of disassembly procedures ...

Page 52: ...12 PCB Diagram 12 1 12 PCB Diagram 12 1 Main Board 12 1 1 Main Board Top Layer 12 1 2 Main Board Bottom Layer ...

Page 53: ...12 PCB Diagram 12 2 Memo ...

Page 54: ...is operating normally 2 1 The maximum power consumption of the panel lamps is described below It may vary depending on the panel manufacturer 17 4 7 0mA 650Vrms 4 4 55W 18 2W 2 2 The power consumption of the Panel Control board is as follows 5V 645mA 3 23W 2 3 The power consumption of the Scaler is as follows 3 3V 204mA 1 8V 145mA 0 93W 13 Circuit Descriptions 13 1 13 Circuit Descriptions 13 1 Ove...

Page 55: ... lutions using up or down scaling that are transferred to the panel in the LDVS formats 5 Crystal Oscillator Use one 14 318MHz oscilla tor externally to supply power to both MCU and Scaler at the same time 6 Scaler EEPROM I2C is a two way serial bus of two lines that supports communications across the integrated circuits as well as between FLASH and EEPROM In particular MCU TSUM16AL LF and use the...

Page 56: ...13 Circuit Descriptions 13 3 13 1 3 IP Board Part Power Schematic Diagrams ...

Page 57: ...OARD part Inverter Part Vin voltage 14 2V Brightness control signal CCFL PWM Control IC IC501 DC to DC 14 2V to 5 0V MosFET U501 Transformer T501 CCFL1 CCFL1 CCFL2 CCFL2 Transformer T502 Voltage feedback Current feedback MosFET U502 ON OFF ...

Page 58: ...hase difference COARSE This adjustment adjusts the display by tuning Video clock and PLL clock L V D S Low Voltage Differential Signaling A kind of transmission method for Digital It can be used from Main PBA to Panel DDC Display data channel It is a communication method between a Host Computer and related equipment It enables Plug and Play between PC and Monitor EDID Extended Display Identificati...

Page 59: ... provides the best quality screen for the user by allowing the computer and the monitor to exchange information automatically This monitor follows the international standard VESA DDC for the Plug Play function Resolution The number of horizontal and vertical dots used to compose the screen image is called resolution This number shows the accuracy of the display High resolution is good for performi...

Page 60: ...5 6 7 8 9 10 11 12 13 14 15 Red Green Blue NC DDC Return GND GND R GND G GND B NC Cable Detect NC Bi Dr Data SDA H Sync V Sync DDC Clock SCL Red Green H V Sync Blue NC DDC Return GND GND R GND G GND B NC Cable Detect NC Bi Dr Data SDA Not Used Not Used DDC Clock SCL Sync on green 14 2 Pin Assignments ...

Page 61: ...24 75Hz 640 350 70Hz 720 400 70Hz 640 480 60Hz 640 480 67Hz 640 480 72Hz 640 480 75Hz 800 600 56Hz 800 600 60Hz 800 600 72Hz 800 600 75Hz 832 624 75Hz 1024 768 60Hz 1024 768 70Hz 1024 768 75Hz 1152 864 75Hz 1152 870 75Hz 1280 1024 60Hz 1280 1024 75Hz 25 175 28 322 25 175 30 240 31 500 31 500 36 000 40 000 50 000 49 500 57 284 65 000 75 000 78 750 108 000 100 000 108 000 135 000 31 469 31 469 31 46...

Page 62: ... manual and adjust the screen as follows Horizontal Frequency The time to scan one line connecting the right edge to the left edge of the screen horizontally is called Horizontal Cycle and the inverse number of the Horizontal Cycle is called Horizontal Frequency Unit kHz Vertical Frequency Like a fluorescent lamp the screen has to repeat the same image many times per second to display an image to ...

Page 63: ...14 Reference Infomation 14 6 14 5 Panel Description INL 631102071830r LCD PANEL 17 MT170EN01 CPT 631102070680r LCS PANEL 17 CLAA170EA07Q CPT Maker VENDOR P N PANEL_CODE PANEL_ABB STICKER_CODE Remarks ...

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