AOC L42W761 Service Manual

AOC L42W761 Service Manual

42'' lcd tv

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42'' LCD TV
Service
Service
Service
Description
Table Of Contents......................................................1
Important Safety Notice...................................................2
Revision List........................................................ 3
1. General Specification...............................................4
2. Operating Instructions.........................................5
2.1. The Use Of Remote Control.................................5
2.2. To Use The Menus............................................6
2.3. How To Connect..............................................13
2.4. Front Panel Control Knobs.................................15
3. Input/Output Specification.......................................16
4. Mechanical Instructions.........................................18
5. Repair Flow Chart ..............................................23
6. PCB Layout ....................................................28
6.1.Main Board....................................................28
6.2.Power Board..............................................30
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
R FOR TH
UNIT WHEN S

TABLE OF CONTENTS

Page
Description
6.3.IR Board.......................................................33
6.4.Connector Board..........................................34
6.5.Key Board.....................................................34
8 Block Diagram..................................................37
9. Schematic.....................................................38
9.1 Main Board................................................38
9.2. Power Board.............................................54
9.3. IR Board....................................................55
9.4. Key Board.............................................56
9.5. Side Board.................................................57
9.6. Audio Board................................................58
10. Exploded View...........................................59
11. BOM List.....................................................60
SAFETY NOTICE
1
AOC L42W761
Horizontal Frequency
31~60kHz
Page

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Summary of Contents for AOC L42W761

  • Page 1: Table Of Contents

    42’’ LCD TV AOC L42W761 Service Service Service Horizontal Frequency 31~60kHz TABLE OF CONTENTS Description Page Description Page Table Of Contents..……......…..1 6.3.IR Board…………………………………………..33 6.4.Connector Board……………………..………..34 Important Safety Notice........……..2 Revision List.…........……..3 6.5.Key Board……………………………….………..34 7. White-Balance, Luminance Adjustment....35 1. General Specification......………..4 2.
  • Page 2: Important Safety Notice

    AOC L42W761 Important Safety Notice Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service procedures recommended by AOC and described in this service manual are effective methods of performing service operations. Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended.
  • Page 3: Revision List

    42’’ LCD TV AOC L42W761 Revision List Version Release Date Revision Instructions TPV Model July-20-2007 Initial Release E427AZNK2WE1NN...
  • Page 4: General Specification

    42’’ LCD TV AOC L42W761 1. General Specification Items Specification Panel Type T420XW01 V500 TW AUO Driving system TFT-LCD AUO Panel Aspect Ratio 16: 9 Resolutions 1366 x768 Active Area 930.25 (H) x 523.01(V) Pixel Pitch 0.681 mm (H) X 0.681 mm(V)
  • Page 5: Operating Instructions

    42’’ LCD TV AOC L42W761 2. Operating Instructions 2.1. The Use of Remote Control 2.2 To Use the Menus...
  • Page 6: To Use The Menus

    42’’ LCD TV AOC L42W761 1. Press the MENU button to display the main menu 2. Use the cursor up/down to select a menu item. 3. Use the cursor left/right to enter a submenu. 4. Press the OK button to enable/disable the function.
  • Page 7 42’’ LCD TV AOC L42W761 The Video menu in most source modes shows as below. It provides several video adjustment items for user fine tuning the video display. Only in VGA source modes, the Video menu simply provides Contrast, Brightness, Back light and Settings (Preset) items.
  • Page 8 42’’ LCD TV AOC L42W761 signals and the composite L/R audio output signals will not be turn-off even though the TV speaker is off. The default setting is On. 8. Settings: Restore the default audio settings. FEATURE MENU The Feature menu in TV mode shows as below. It provides certain optional control functions such as time set, sleep timer, video noise reduction, parental control (V-chip) and close caption style setting.
  • Page 9 42’’ LCD TV AOC L42W761 4. Password Set: Change the 4-numeral parental control password. Three steps are required for changing the password: Enter Old Password -> Enter New Password -> Confirm New Password. Note: This item is only available in TV, Composite and S-Video source modes. The default password is 『0 0 0 0』.
  • Page 10 42’’ LCD TV AOC L42W761 6. Digital Captions: Select the close caption options ( Service 1-6, Text 1-4 and CC 1-4) in digital TV mode. When select service 1 to service 6 you can modulate parameters in the Digital Close Caption.
  • Page 11 42’’ LCD TV AOC L42W761 【Edge Effect】: The text edge effects, which gives None / Raised / Depressed / Uniform / Left Shadow / Right Shadow modes. 【Edge Color】: The colors of text edge effects, which provides Red / Green / Blue / Yellow / Magenta / Cyan / Black / White Colors.
  • Page 12 42’’ LCD TV AOC L42W761 2.Increase the separation between the equipment and the TV. 3.Connect the equipment into wall power outlet on a circuit different from that to which the receiver is connected. 4.Consult the dealer or an experienced radio or television technician for help.
  • Page 13: How To Connect

    42’’ LCD TV AOC L42W761 2.3 How to Connect There are several ways to connect your TV. Please use the following chart to determine which connection is best for you. Once your equipment is connected, use the following procedure to view the input signal: Press the source button on the remote controller to select the relevant source to view.
  • Page 14 42’’ LCD TV AOC L42W761 Note: The MUTE key on the remote control works on both TV internal speaker and the earphone output.
  • Page 15: Front Panel Control Knobs

    42’’ LCD TV AOC L42W761 2.4 Front Panel Control Knobs...
  • Page 16: Input/Output Specification

    42’’ LCD TV AOC L42W761 3. Input/Output Specification 3.1 RGB Signal input 15 - Pin Color Display Signal Cable Pin No. Description Pin No. Description Red Video Mandatory +5V Supply for PC Bypass Green Video Sync Ground Blue Video SDA(Remote Control)
  • Page 17 42’’ LCD TV AOC L42W761 3.3 Compatible Mode Table VESA MODES Horizontal Vertical Nominal Nominal Nominal Sync Sync Pixel Mode Resolution Total Frequency Freq. Polarit Polarity Clock (KHz) (Hz) (MHz) 640x480@60Hz 800 x 525 31.469 59.940 25.175 640x480@72Hz 832 x 520 37.861...
  • Page 18: Mechanical Instructions

    42’’ LCD TV AOC L42W761 4. Mechanical Instructions 1. Remove the base first with six screws in the base. 2. Remove the screws in red to remove the rear cover.
  • Page 19 42’’ LCD TV AOC L42W761 3. Remove the speaker cover and the cover-shield. 4. Remove the screws in red to remove the two metallic bracket and button assemble.
  • Page 20 42’’ LCD TV AOC L42W761 5. Remove the screws and pull out the connecters to remove the board.
  • Page 21 42’’ LCD TV AOC L42W761 6. Remove the screws and connectors in red to remove the bezel and speakers.
  • Page 22 42’’ LCD TV AOC L42W761 7. Remove the screws to remove the left and right metallic bracket.
  • Page 23: Repair Flow Chart

    42’’ LCD TV AOC L42W761 5. Repair Flow Chart 1. No Power (No LED indicator) NO POWER Plug in power cord and interface Check power cord Replace F901 or BD901 or D902 Check F901, BD901, D902 Replace IC931, IC971, or Q931 or Q932 (VCC) Check IC931, IC971,Q931 ,Q932...
  • Page 24 42’’ LCD TV AOC L42W761 2. Can not start (LED indicator yellow) Check key board Repair the key board Check the standby voltage of main board Replace U903,U906,U907,U908,U909,U911 Check U401 Replace U401 Replace U404 Check U404 Check the components of I...
  • Page 25 42’’ LCD TV AOC L42W761 3. Abnormal display Check the source Reset source Replace the filter or inductance Check signal filter circuit TV signal Check TV system setup Replace TU701 Check TU701 Replace U701 Check U701 NTSC, AV, Check U108...
  • Page 26 42’’ LCD TV AOC L42W761 4. No sound Reset source Check the source Check signal filter circuit Replace the filter or inductance Replace the Earphone jack Check Earphone jack SIF signal Check TV system setup Replace TU701 Check TU701 Replace U701...
  • Page 27 42’’ LCD TV AOC L42W761 5. Key Board OSD is unstable or not working Is Key Pad Board connecting normally? Connect Key Pad Board Is Button Switch normally? Replace Button Switch Replace Key Pad Board Is Key Pad Board Normally?
  • Page 28: Pcb Layout

    42’’ LCD TV AOC L42W761 6. PCB Layout 6.1 Main Board...
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  • Page 30: Power Board

    42’’ LCD TV AOC L42W761 6.2 Power Board...
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  • Page 33: Ir Board

    42’’ LCD TV AOC L42W761 6.3 IR Board...
  • Page 34: Connector Board

    42’’ LCD TV AOC L42W761 6.4 Side Board 6.5 Key Board...
  • Page 35: White-Balance, Luminance Adjustment

    42’’ LCD TV AOC L42W761 7. White Balance, Luminance Adjustment Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment. Please select channel 03 to adjust the white balance. Color Temp. Cold Normal Warm PC MODE...
  • Page 36 42’’ LCD TV AOC L42W761 B. Adjust Normal color-temperature: 1. Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>450 cd/m ± 30 cd/m 2. Switch the chroma-7120 to RGB-mode (with press “MODE” button) 3. Switch the MEM. channel to Channel 03 (with up or down arrow on chroma-7120) 4.
  • Page 37: Block Diagram

    42’’ LCD TV AOC L42W761 8. Block Diagram...
  • Page 38: Schematic

    42’’ LCD TV AOC L42W761 9. Schematic Diagram 9.1 Main Board...
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  • Page 54: Power Board

    42’’ LCD TV AOC L42W761 9.2 Power Board C943 C944 C945 R947 R948 3300PF/50V 3300PF/50V 3300PF/50V 47 1/4W 47 1/4W R949 R950 D902 47 1/4W 47 1/4W L906 FMX-G26S T931 D950 R931 BD901 POWER X'FMR FME-210B L931 0.1 ohm +12V...
  • Page 55: Ir Board

    42’’ LCD TV AOC L42W761 9.3 IR Board...
  • Page 56: Key Board

    42’’ LCD TV AOC L42W761 9.4 Key Board...
  • Page 57: Side Board

    42’’ LCD TV AOC L42W761 9.5 Side Board...
  • Page 58: Audio Board

    42’’ LCD TV AOC L42W761 9.6 Audio Board...
  • Page 59: Exploded View

    42’’ LCD TV AOC L42W761 10. Exploded View...
  • Page 60: Bom List

    42’’ LCD TV AOC L42W761 11. BOM List E427AZNK2WE1NN Location Part NO. Description 001T6020 5 SCREW 026T 800504 3 BARCODE LABEL 033T 465 1 CLIP JOINTER 044T6002709 3A PAPER BOARD 044T9003 3 CORNER PAPER 050T 500 1 CABLE TIE 050T 600 1 W...
  • Page 61 42’’ LCD TV AOC L42W761 R003 061T0603473 CHIP 47KOHM 1/16W R002 061T0603473 CHIP 47KOHM 1/16W R001 061T0603473 CHIP 47KOHM 1/16W R004 061T0603473 CHIP 47KOHM 1/16W C105 065T0603101 31 CHIP 100PF 50V NPO C106 065T0603101 31 CHIP 100PF 50V NPO C107...
  • Page 62 42’’ LCD TV AOC L42W761 SW23 077T 600 1GCJ TACT SWITCH TSPB-2 -NP SW24 077T 600 1GCJ TACT SWITCH TSPB-2 -NP SW22 077T 600 1GCJ TACT SWITCH TSPB-2 -NP SW21 077T 600 1GCJ TACT SWITCH TSPB-2 -NP 065T0603104 32 CHIP 0.1UF 50V X7R 065T0603104 32 CHIP 0.1UF 50V X7R...
  • Page 63 42’’ LCD TV AOC L42W761 C939 065T 2K222 1A6921 CAP CER 2200PF K 2KV C909 065T306K4712BP 470PF +-10% 250VAC C908 065T306K4712BP 470PF +-10% 250VAC C905 065T306M2222BP Y1.CAP.0022UF 250V AC C910 065T517K103 2B GP CK45B2H103KYJ 0.01UF 500V C918 067T 40C10115K EC CAP 100UF 450V 18*35MM...
  • Page 64 42’’ LCD TV AOC L42W761 D976 093T 60247 DIODE FME-220A TO-220 SANKEN D975 093T 60247 DIODE FME-220A TO-220 SANKEN 0M1T1730 10120 SCREW Q90T0096A01 HEAT SINK 705TQE93003 BD901 ASS'Y BD901 093T 50460 18 D10XB60 0M1T1730 10120 SCREW Q90T0132 1 HEAT SINK...
  • Page 65 42’’ LCD TV AOC L42W761 R981 061T0805330 RST CHIPR 33 OHM +-5% 1/8W R958 061T0805330 2F RST CHIPR 33 KOHM +-1% 1/8W R990 061T0805332 RST CHIPR 3.3 KOHM +-5% 1/8W R959 061T0805360 1F RST CHIPR 3.6 KOHM +-1% 1/8W R922...
  • Page 66 42’’ LCD TV AOC L42W761 C993 065T0805102 32 CHIP 1000PF 50V X7R 0805 C994 065T0805102 32 CHIP 1000PF 50V X7R 0805 C995 065T0805102 32 CHIP 1000PF 50V X7R 0805 C929 065T0805102 32 CHIP 1000PF 50V X7R 0805 C933 065T0805103 32...
  • Page 67 42’’ LCD TV AOC L42W761 R995 061T 17215452T RST CFR 150KOHM +-5% 1/4W R920 061T 17247152T 470OHM 5% 1/4W R955 061T 17247152T 470OHM 5% 1/4W R9009 061T 17251052T RST CFR 51 OHM +-5% 1/4W R966 061T 20010452T 100K OHM 1/4W 1%...
  • Page 68 42’’ LCD TV AOC L42W761 J924 095T 90 23 JUMP WIRE J923 095T 90 23 JUMP WIRE J922 095T 90 23 JUMP WIRE J901 095T 90 23 JUMP WIRE 715T2512 2 POWER BOARD PCB AUPF7QA1 AUDIO BOARD 033T3278 2 WAFER...
  • Page 69 42’’ LCD TV AOC L42W761 061T1210000 RST CHIPR 0 OHM +-5% 1/3W 065T0603102 32 CHIP 1000PF 50V X7R 065T0603102 32 CHIP 1000PF 50V X7R 065T0603102 32 CHIP 1000PF 50V X7R 065T0603102 32 CHIP 1000PF 50V X7R 065T0603103 32 CHIP 0.01UF 50V X7R 065T0603103 32 CHIP 0.01UF 50V X7R...
  • Page 70 42’’ LCD TV AOC L42W761 CN905 033T3802 9 WAFER PH-9 CN901 033T3802 12 WAFER PH-12 CN407 033T8027 28 WAFER 040T 457624 1B CPU LABEL 040T 45762412B CBPC LABEL SF701 053T 44 5 SAW FILTER EPCOS R935 061T152M629 64 6.2 OHM 2W 5% MOF...
  • Page 71 42’’ LCD TV AOC L42W761 U407 056T 643500 EM6353BX2SP3B-2.9 U401 056T 644600 IC ZR39660BGCG ZORAN U408 056T 645 1 HIN232CB-T S016 INTERSIL U701 056T 647 12 IC CAS-220/CS LQFP-100 ZORAN U913 056T 662 4 RCLAMP0514M.TBT U912 056T 662 4 RCLAMP0514M.TBT...
  • Page 72 42’’ LCD TV AOC L42W761 RP407 061T 125150 8 RST CHIP AR 8P4R 15 OHM +-5% 1/16W RP406 061T 125150 8 RST CHIP AR 8P4R 15 OHM +-5% 1/16W RP405 061T 125150 8 RST CHIP AR 8P4R 15 OHM +-5% 1/16W...
  • Page 73 42’’ LCD TV AOC L42W761 R154 061T0603000 CHIP 0OHM 1/16W R153 061T0603000 CHIP 0OHM 1/16W R152 061T0603000 CHIP 0OHM 1/16W R151 061T0603000 CHIP 0OHM 1/16W R150 061T0603000 CHIP 0OHM 1/16W R1003 061T0603000 CHIP 0OHM 1/16W R977 061T0603100 CHIP 10OHM 1/16W...
  • Page 74 42’’ LCD TV AOC L42W761 R995 061T0603103 CHIP 10KOHM 1/16W R994 061T0603103 CHIP 10KOHM 1/16W R978 061T0603103 CHIP 10KOHM 1/16W R953 061T0603103 CHIP 10KOHM 1/16W R939 061T0603103 CHIP 10KOHM 1/16W R725 061T0603103 CHIP 10KOHM 1/16W R714 061T0603103 CHIP 10KOHM 1/16W...
  • Page 75 42’’ LCD TV AOC L42W761 R4K7 061T0603104 CHIP 100K OHM 1/16W R4K8 061T0603104 CHIP 100K OHM 1/16W R674 061T0603104 CHIP 100K OHM 1/16W R1001 061T0603104 CHIP 100K OHM 1/16W R900 061T0603104 CHIP 100K OHM 1/16W R719 061T0603105 CHIP 1MOHM 1/16W...
  • Page 76 42’’ LCD TV AOC L42W761 R1H2 061T0603272 CHIP 2.7KOHM 1/16W R1H1 061T0603272 CHIP 2.7KOHM 1/16W R483 061T0603274 RST CHIPR 270 KOHM +-5% 1/10W R476 061T0603274 RST CHIPR 270 KOHM +-5% 1/10W R946 061T0603302 CHIP 3K OHM 5% 1/16 R4P4 061T0603330...
  • Page 77 42’’ LCD TV AOC L42W761 R436 061T0603472 CHIP 4.7KOHM 1/16W R438 061T0603472 CHIP 4.7KOHM 1/16W R440 061T0603472 CHIP 4.7KOHM 1/16W R458 061T0603472 CHIP 4.7KOHM 1/16W R468 061T0603472 CHIP 4.7KOHM 1/16W R4B3 061T0603472 CHIP 4.7KOHM 1/16W R4L7 061T0603472 CHIP 4.7KOHM 1/16W...
  • Page 78 42’’ LCD TV AOC L42W761 R1B6 061T0603473 CHIP 47KOHM 1/16W R1B5 061T0603473 CHIP 47KOHM 1/16W R1B4 061T0603473 CHIP 47KOHM 1/16W R1B3 061T0603473 CHIP 47KOHM 1/16W R1B2 061T0603473 CHIP 47KOHM 1/16W R465 061T0603499 9F RST CHIPR 49.9 OHM +-1% 1/10W R469 061T0603499 9F RST CHIPR 49.9 OHM +-1% 1/10W...
  • Page 79 42’’ LCD TV AOC L42W761 R4N3 061T0805750 RST CHIPR 75 OHM +-5% 1/8W R4N4 061T0805750 RST CHIPR 75 OHM +-5% 1/8W R4N5 061T0805750 RST CHIPR 75 OHM +-5% 1/8W R508 061T0805750 RST CHIPR 75 OHM +-5% 1/8W R509 061T0805750 RST CHIPR 75 OHM +-5% 1/8W...
  • Page 80 42’’ LCD TV AOC L42W761 C704 065T0603103 32 CHIP 0.01UF 50V X7R C709 065T0603103 32 CHIP 0.01UF 50V X7R C710 065T0603103 32 CHIP 0.01UF 50V X7R C718 065T0603103 32 CHIP 0.01UF 50V X7R C719 065T0603103 32 CHIP 0.01UF 50V X7R...
  • Page 81 42’’ LCD TV AOC L42W761 C4H3 065T0603104 32 CHIP 0.1UF 50V X7R C4H4 065T0603104 32 CHIP 0.1UF 50V X7R C4H5 065T0603104 32 CHIP 0.1UF 50V X7R C4H6 065T0603104 32 CHIP 0.1UF 50V X7R C4H7 065T0603104 32 CHIP 0.1UF 50V X7R...
  • Page 82 42’’ LCD TV AOC L42W761 C406 065T0603104 32 CHIP 0.1UF 50V X7R C407 065T0603104 32 CHIP 0.1UF 50V X7R C408 065T0603104 32 CHIP 0.1UF 50V X7R C409 065T0603104 32 CHIP 0.1UF 50V X7R C410 065T0603104 32 CHIP 0.1UF 50V X7R...
  • Page 83 42’’ LCD TV AOC L42W761 C434 065T0603104 32 CHIP 0.1UF 50V X7R C435 065T0603104 32 CHIP 0.1UF 50V X7R C436 065T0603104 32 CHIP 0.1UF 50V X7R C437 065T0603104 32 CHIP 0.1UF 50V X7R C438 065T0603104 32 CHIP 0.1UF 50V X7R...
  • Page 84 42’’ LCD TV AOC L42W761 C996 065T0603509 31 CHIP 5PF 50V NPO C995 065T0603509 31 CHIP 5PF 50V NPO C994 065T0603509 31 CHIP 5PF 50V NPO C998 065T0603509 31 CHIP 5PF 50V NPO C999 065T0603509 31 CHIP 5PF 50V NPO...
  • Page 85 42’’ LCD TV AOC L42W761 C601 067T411F4703XT EC 105℃ SMD CAP 47UF M 16V C609 067T411F4703XT EC 105℃ SMD CAP 47UF M 16V C905 067T411F4703XT EC 105℃ SMD CAP 47UF M 16V C909 067T411F4703XT EC 105℃ SMD CAP 47UF M 16V...
  • Page 86 42’’ LCD TV AOC L42W761 FB713 071T 57G601 BEAD 1206 600 OHM FB712 071T 57G601 BEAD 1206 600 OHM FB706 071T 57G601 BEAD 1206 600 OHM FB705 071T 57G601 BEAD 1206 600 OHM FB409 071T 58B151 K CHIP BEAD 150 OHMFBMA-11-32251...
  • Page 87 42’’ LCD TV AOC L42W761 ZD144 093T 39147SEM ZMM5V6 ZD145 093T 39147SEM ZMM5V6 ZD146 093T 39147SEM ZMM5V6 ZD147 093T 39147SEM ZMM5V6 ZD148 093T 39147SEM ZMM5V6 ZD149 093T 39147SEM ZMM5V6 ZD600 093T 39147SEM ZMM5V6 ZD139 093T 39147SEM ZMM5V6 ZD138 093T 39147SEM...
  • Page 88 42’’ LCD TV AOC L42W761 IRPF7QA4 IR BOARD 033T3802 5 AUDIO IN 056T 627 14 1 IC KSM-2003TN2E 37.9KHZ 061T0603101 CHIP 100OHM 1/16W 061T0603102 CHIP 1K OHM 1/16W 061T0603102 CHIP 1K OHM 1/16W 061T0603153 RST CHIPR 15 KOHM +-5% 1/10W 065T0603104 32 CHIP 0.1UF 50V X7R...

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