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34

Troubleshooting

This chapter provides troubleshooting information for the AL2051W:

1. Main board

No power

Chapter 4

No power

Press power key and look

if the picture is normal

Please reinsert and make sure

the AC of 100-240 is normal

Measure U703 PIN2=1.8V

U705 PIN2=3.3V

Reinsert or check the
Adapter/Inverter
section

X401 and X402 oscillate

waveforms are normal

Check CN201 or replace
U703, U705

Replace U401

Replace U402

Replace X401, X402

OK

OK

OK

NG

NG

NG

NG

NG

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Summary of Contents for AL2051

Page 1: ...1 Acer AL2051W Service Guide ...

Page 2: ...2 Service Guide Version and Revision No Version Release Date Revision History TPV Model 1 2 1 0 2 0 Dec 15 2005 Jan 04 2006 Initial release Draft Version Final Version TA90KAUHKGAEAP TA90KAUDBGAFACP ...

Page 3: ...buyer and not Acer Incorporated its distributor or its dealer assumes the entire cost of all necessary servicing repair and any incidental or consequential damages resulting from any defect in the software Intel is a registered trademark of Intel Corporation Pentium and Pentium II III are trademarks of Intel Corporation Other brand and product names are trademarks and or registered trademarks of t...

Page 4: ...erence in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television receptio...

Page 5: ... during a lightning storm or when it will not be used for long periods of time This will protect the monitor from damage due to power surges Do not overload power strips and extension cords Overloading can result in fire or electric shock Never push any object into the slot on the monitor cabinet It could short circuit parts causing a fire or electric shock Never spill liquids on the monitor Do no...

Page 6: ...t 14 Main Board Layout 16 Front Bezel 17 Rear Bezel 18 Chapter 2 Operating Instructions 19 External Controls 19 Front Panel Controls 20 Adjusting the picture 21 Hot Key Menu 24 OSD Message 24 Logo 25 Chapter 3 Machine Disassembly 26 Chapter 4 Troubleshooting 34 Chapter 5 Connector Information 40 Chapter 6 FRU Field Replacement Unit List 41 Exploded Diagram 42 Chapter 7 Schematic Diagram 46 Main Bo...

Page 7: ...eakers Description The LCD monitor is designed with the latest LCD technology to provide a performance oriented product with no radiation This will alleviate the growing health concerns It is also a space saving design allowing more desktop space and comparing to the traditional CRT monitor it consumes less power and gets less weight in addition MTBF target is 50k hours or more Chart of AL2051W Pa...

Page 8: ...ghtness control Set to Factory preset value cut off raster User contrast control T Set to factory preset value which allows that the brightest two of 32 linear distributed gray scales 0 700mv can be distinguished User red white balance Green white balance and Blue white balance control In the center unless otherwise specified Power input 230V 5 50 3 Hz Ambient temperature 20 5 Measurement systems ...

Page 9: ...er one triad x 0 258 Pixels H x V 1680 x3 x 1050 Pixel clock 202 MHz Max Contrast ratio 800 1 Typ Brightness 300 cd m2 6mA Typ Response time Tr Tf 16 ms Display color 16 7M colors RGB 8 bit data Viewing angle 176 H 176 V Pc interface RGB Analog Interface Digital interface Signal connector D Sub 15pin DVI D 24pin Interface frequency Horizontal Frequency 30KHz 91KHz Vertical Frequency 55Hz 85Hz Plug...

Page 10: ...ution 1680 x 1050 Display Dot 1680 x3 x 1050 Display Area 433 44mm H x 270 90mm V Pixel Pitch 0 258mm H x 0 258mm V Display Color 16 7M true Lamp Frequency 50kHz Max Lamp Current 6 0 mArms typ Weight 2950g typ Optical Specifications The optical characteristics are measured under stable conditions at 25 ...

Page 11: ...11 Supported Timing Support Modes There will be 20 total support modes to accommodate the above mode and other video modes within the frequency range of the monitor ...

Page 12: ... brightness control logic and DDC The Inverter board will drive the backlight of panel Video signal DDC Power Board Include Inverter and adapter board Flat Panel and CCFL backlight Main Board Include Audio and Keypad board RS232 Connector For white balance adjustment in factory mode Host Computer CCFL Drive AC IN 100V 240 ...

Page 13: ...1 EEPROM AT24C16AN 10SU 2 7 U403 D Sub Connector CN101 EEPROM M24C02 WMN6TP U101 RGB DB15_SDA DB15_SCL EPR_SDA EPR_SCL Panel connector CN407 OSD Control KEY PAD Frame Memory U303 DVI Connector CN102 EEPROM M24C02 WMN6TP U102 DVI_SDA DVI_SCL H sync V sync RXD TXD DVI Video Signal ...

Page 14: ...14 Software Flow Chart 1 2 N Y 5 Y N 10 Y N 12 Y N 7 Y N 6 4 3 8 9 14 11 13 Y N 15 Y N 16 17 19 Y N 18 ...

Page 15: ... set it to green color Scalar initializes 10 In standby mode 11 Update the lifetime of back light 12 Check the analog port are there any signals coming 13 Does the scalar send out an interrupt request 14 Wake up the scalar 15 Are there any signals coming from analog port 16 Display No connection Check Signal Cable message And go into standby mode after the message disappears 17 Program the scalar ...

Page 16: ...5PIN CN602 88G 30214K PHONE JACK 5PIN CN701 88G 3041CE DC JACK 3PIN CN101 88G 35315F H D SUB 15PIN CN102 88G 35424F H DVI CONNECTOR 24PIN X401 93G 22 53 CRYSTAL 14 318MHzHC 49U X402 93G 22 55 H 20MHZ 20PF 49US U401 56G 562120 MST9251A LF 205 U402 56G1125170AC1 W79E632 BY WINBOND ...

Page 17: ...17 Front Bezel External Controls Item Description Item Description 1 Volume 4 MENU ENTER 2 Volume 5 Auto Adjust Key Exit 3 Power Key Power Indicator ...

Page 18: ...18 Rear Bezel Item Description Item Description 1 D SUB Cable 4 External Adapter 2 DC Jack Power Cable 5 DVI Cable 3 AC Power Cord 6 Audio Cable ...

Page 19: ...s the picture can be adjusted to your personal preferences The power cord should be connected Connect the video cable from the monitor to the video card Press the power button to turn on the monitor position The power indicator will light up External Controls Item Description Item Description 1 Volume 4 MENU ENTER 2 Volume 5 Auto Adjust Key Exit 3 LED Power Key Chapter 2 ...

Page 20: ... button for 2 seconds to activate the Auto Adjustment function The Auto Adjustment function is used to set the HPos VPos Clock and Focus Power Indicator Blue Power On mode Orange Power Off mode NOTES Notes Do not install the monitor in a location near heat sources such as radiators or air ducts or in a place subject to direct sunlight or excessive dust or mechanical vibration or shock Save the ori...

Page 21: ...unction 3 Press the MENU button to select the function that you want to adjust 4 Press or to change the settings of the current function 5 To exit and save select the exit function If you want to adjust any other function repeat steps 2 4 Analog Input only model Dual Input Model Analog Signal Input Dual Input Model Digital Signal Input ...

Page 22: ...22 b The Description For Control Function ...

Page 23: ...23 ...

Page 24: ...en Analog signal input if User Press Hot Key Auto will show this message and the monitor do the auto config function Input Not Supported When the Hsync Frequency Vsync Frequency or Resolution is out of the monitor support range will show this message This message will be flying Cable Not Connected Analog Only Model When the video cable is not connected will show this message This message will be f...

Page 25: ...here is no video input signal present When there is no video input signals this monitor following a time out period will automatically switch to an OFF mode This reduces the monitor s internal power supply consumption After the video input signal is restored full power is restored and the display is automatically redrawn The appearance is similar to a Screen Saver feature except the display is com...

Page 26: ...26 Machine Disassembly This chapter contains step by step procedures on how to assemble the monitor for maintenance Disassembly Procedure The back view Chapter 3 ...

Page 27: ...27 1 Remove two screws Fig 1 2 Remove the hinge cover Fig 2 3 Remove the one screw Fig 3 Fig 1 Fig 2 Fig 3 ...

Page 28: ...28 4 Firstly find out the two hooks position Fig 4 5 Then pry the rear cover up as arrowhead direction Fig 5 6 Remove the six screws Fig 6 Fig 4 Fig 5 Fig 6 ...

Page 29: ...harnesses of main board and panel main board and power board Fig 7 8 Remove four screws Fig 8 9 Pry the main frame on the left to remove bezel Fig 9 1 Pry the main frame on the right to remove bezel Fig 9 2 Fig 7 Fig 8 Fig 9 1 ...

Page 30: ...30 Fig 9 2 10 Remove the screws for frame on the left Fig 10 1 Remove the screws for frame on the right Fig 10 2 Fig 10 1 Fig 10 2 ...

Page 31: ...31 11 Disconnect the wire harness for power board and lamps Fig 11 12 Remove the four screws to remove the main board Fig 12 13 Remove the eight screws to remove BKT base Fig 13 Fig 11 Fig 12 Fig 13 ...

Page 32: ...32 14 Remove the two screws to loose the copper manganese wire Fig 14 15 Remove the four screws and disconnect the wire harness Fig 15 16 Remove the four screws Fig 16 Fig 14 Fig 15 Fig 16 ...

Page 33: ...33 17 Turn the six clips anticlockwise to remove the shielding Fig 17 18 Disconnect the wire harness of main board and panel Fig 18 The end Fig 17 Fig 18 ...

Page 34: ... power key and look if the picture is normal Please reinsert and make sure the AC of 100 240 is normal Measure U703 PIN2 1 8V U705 PIN2 3 3V Reinsert or check the Adapter Inverter section X401 and X402 oscillate waveforms are normal Check CN201 or replace U703 U705 Replace U401 Replace U402 Replace X401 X402 OK OK OK NG NG NG NG NG ...

Page 35: ...ce U402 Replace X401 Measure U703 PIN2 1 8V U705 PIN2 3 3V Check Correspondent component Replace U401 X402 oscillate waveform is normal Replace U703 U705 OK OK OK OK OK NG NG NG NG Check reset circuit of U402 is normal Check HS VS from CN407 is normal Replace X402 Check Correspondent component NG NG OK ...

Page 36: ...only Please re do WHITE Balance White screen Measure Q701 base is high level X401 oscillate waveform is normal Check Q701 Q702 is broken or CN407 solder Check Correspondent component Replace Panel Check Correspondent component Replace U402 OK OK OK Replace X401 OK NG NG NG NG Check reset circuit of U402 is normal ...

Page 37: ...k AC line Check the voltage of C904 Check F901 bridge rectified circuit Check start voltage for the pin3 of IC901 Check R903 R904 IC901 Check the auxiliary voltage is between 10V 16V Check Q902 Q903 Check T901 D902 OK Check D904 D905 IC902 OK NG No power NG NG OK NG ...

Page 38: ...N OFF signal Check IC801 PIN5 5V 0 25V Check adapter board Check main board OK OK NG NG Check Q802 Q804 ZD803 circuit NG OK Check IC801 PIN18 triangular wave is normal Check R821 C821 Check IC801 PIN11 12 19 20 End no output debug Check feedback NG OK NG OK ...

Page 39: ...oard OSD is unstable or not working Is Keypad Board connecting normally Connect Keypad Board Is Button Switch normally Replace Button Switch Y N N Is Keypad Board Normally Replace Keypad Board N Y Check Main Board ...

Page 40: ...ound 14 V Sync 7 G Ground 15 DDC Serial Clock 8 B Ground 24 Pin Color Display Signal Cable DVI Pin No Description Pin No Description 1 TMDS Data2 13 TMDS Data3 2 TMDS Data2 14 5V Power 3 TMDS Data 2 4 Shield 15 Ground 4 TMDS Data4 16 Hot Plug Detect 5 TMDS Data4 17 TMDS Data0 6 DDC Clock 18 TMDS Data0 7 DDC Data 19 TMDS Data 0 5 Shield 8 Analogue Vertical Sync 20 TMDS Data5 9 TMDS Data1 21 TMDS Da...

Page 41: ...tever reasons a part number change is made it will not be noted in the printed Service Guide For ACER AUTHORIZED SERVICE PROVIDERS your Acer office may have a DIFFERENT part number code from those given in the FRU list of this printed Service Guide You MUST use the local FRU list provided by your regional Acer office to order FRU parts for repair and service of customer machines NOTE To scrap or t...

Page 42: ...42 Exploded Diagram Model AL2051W ...

Page 43: ...ve picture show the description of the following component Item Picture Description Part No HINGE COVER F 33G4967 QW L 1 HINGE COVER B 33G4968 QT L 2 BEZEL 34G1782AQW B 3 BACK COVER 34G1784 QU B 4 MAIN FRAME 15G8290 1 ...

Page 44: ...44 5 SHIELDING 85G 732 1 6 PANEL 750GLUA1W1211N 7 MAIN BOARD AICA90KAUAEP 8 POWER BOARD ADPC1260AXP 9 INPC BOARD INPC2062AUA1P ...

Page 45: ...45 10 SPEAKERS 78G 322 3B 11 BASE 34G1785 QW B 12 BASE BACK COVER 33G4965AQT 1L 13 HINGE HOLDER 20G 041 1 ...

Page 46: ...D_MPLL AVDD_DVI VDDC AVDD_PLL 3 3DV2 3 3DV1 2 5MVDD APLL AVDDPLL2 SOG GIN GNDG BIN GNDB GNDR RIN HSYNC VSYNC B B G G R R CLK CLK FSDQSU0 FSWE FSDQSU1 FSCLK FSDQM1 FSCLK FSDQSU2 FSBKSEL0 FSDATAU 0 31 FSDQM0 FSCKE FSCAS FSBKSEL1 FSDQSU3 FSRAS FSADDR 0 11 HWRESET WR INT RD ALE AD0 AD1 AD2 AD3 AdjBACKLITE Volume VLCD B6 7 AUDIO VOLUME AUDIO_SD VCC12V_AUDIO AUDIO_MU AVDDPLL2 2 5V_DMQ TOP 1 715G1765 1 f...

Page 47: ... Vin Vo2 ON_OFF 3 3AVDD for AVDD_DVI AVDD_DVI 2 5MVDD VCC5V VCC5V C711 1000pF C714 0 1uF 16V C773 1000pF 09 27 Modified by SC 0805 D702 SMB340 S D G 706 AO3401 FB701 600 OHM R724 0 1 16W L705 120 OHM S D G Q701 AO3401 C719 0 1uF VDD_MPLL 5 onPOWER 7 Remove C94 C95 U13 3 3DV1 LCD I F Pad 3 3DV2 Host bus 0414 PLL_GND Q703 PMBS3904 C E B 1 8V_VDD Q704 PMBS3904 C E B C742 0 1uF CN702 CONN 1 2 3 4 5 6 ...

Page 48: ...W ST_DET2 7 D103 BAV99 3 1 2 C119 0 1uF D109 TZMC5V6 GS08 D113 LL5232B 5 6V 5 D106 BAV70 3 1 2 C106 NC VGA_CON C109 0 047uF D107 TZMC5V6 GS08 D108 TZMC5V6 GS08 R131 4 7K 1 16W R135 10 1 16W C102 0 047uF PC5V R121 100 1 16W GNDG 5 R134 10 1 16W R101 75 1 16W U102 M24C02WMN6 1 2 3 4 5 6 7 8 A0 A1 A2 GND SDA SCL WP VCC C124 0 1uF BIN 5 CLK_DDC2 D123 BAV99 3 1 2 C105 0 001uF G 5 D121 BAV99 3 1 2 R118 ...

Page 49: ... MDATA 31 MDATA 30 MDATA 29 MDATA 28 VDDM GND MDATA 27 MDATA 26 MDATA 25 MDATA 24 MDATA 23 MDATA 22 GND VDDM MDATA 21 MDATA 20 MDATA 19 MDATA 18 MDATA 17 MDATA 16 DQS 2 DQM 1 MCLKZ MVREF MADR 11 DQS 1 DQS 0 PWM0 VDDC GND VDDP GND VDDP NC NC NC NC NC NC NC NC NC NC MCU INTERFACE AD1 FSDQM1 6 FSDQM0 6 FSDQSU3 6 WR 7 TXB3 AD2 C425 0 1uF GIN 4 GND FSDATAU27 G 4 FSBKSEL0 6 FSDATAU7 FSDATAU3 R 4 FSDQSU2...

Page 50: ...F FSDQSU0 5 FSRAS FSBKSEL0 FSDATAU16 FSCKE 5 FSDQSU2 5 FSDATAU1 FSDQSU3 5 FSDQM00 FSDATA15 FSRAS 5 FSCLK FSDATA25 FSDATAU25 FSDATA24 RN304 33 1 16W 1 2 3 4 8 7 6 5 FSDATAU22 FSDATA17 Near The DDR SDRAM IC Stub as short as possible GND 2 5V_DMQ FSDATA19 C312 0 1uF R306 33 1 16W C314 0 1uF 2 5V_DMQ 3 U303 EM6A9320BI 5M M4 M5 L5 M6 M7 L8 M8 M9 M10 L7 K5 L6 A6 B5 A5 A4 B1 C2 C1 D1 J12 J11 H12 H11 F12 ...

Page 51: ...16W KEY_AUTO C442 0 001uF KEY_ONOFF Mute SW402 KEY LEFT KEY_RIGHT R462 10K 1 16W R460 10K 1 16W DDC_WP 4 AD1 5 AUDIO_MU 8 onPANEL_5V 3 3V 3 VCPU R461 10K 1 16W Standby R433 120 1 16W R463 10K 1 16W R454 10K 1 16W RP401 10K 1 16W 1 2 3 4 8 7 6 5 R430 470 1 16W Reset Circuit ENTER SW405 KEY MENU SW403 KEY AUTO AUDIO_SD 8 For Hardware ISP R435 470 1 16W DDC_DAT 4 R434 120 1 16W RIGHT C445 0 1uF 16V R...

Page 52: ...for AL2051W acer A4 8 8 Tuesday January 03 2006 Title Size Document Number Rev Date Sheet of VCC12V_AUDIO U601 TDA7496L 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 GND GND GND INL VAROUT_L VOLUME VAROUT_R NC INR SVR STBY MUTE GND OUTR VS VS OUTL GND GND GND CN603 EAR PHONEJACK 1 5 4 3 2 7 8 Volume 5 C602 220uF 16V R602 18K 1 16W C601 220uF 16V R601 18K 1 16W C606 0 47uF 16V C607 220uF 16V V...

Page 53: ...53 Power Inverter board ...

Page 54: ...0 0805 Q808 RK7002 C822 2 2uF 1206 R853 0 0805 ZD803 5 6V R847 2M 0805 C809 4 7uF 1206 X5R D815 1N4148 C845 470pF R842 2M 0805 R809 120K 1 8W R810 22 0805 D805 1N4148 R848 2M 0805 R806 10K 0805 C827 470pF C808 10pF 3KV Q802 DTA144WKA 3 2 1 R830 430 1 0805 R864 1K 0805 L806 200uH Q806 NC 3 2 1 CN801 CONN 33G8020 5D U 1 2 3 4 5 C801 33pF 3KV R822 9 1k 0805 R820 NC Q812 FSI4502 1 2 3 4 5 6 7 8 S1N G1...

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