AOC A20S431 Service Manual Download Page 37 | Manualshive

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AOC A20S431

36

36T 426 KN 4C

SPEAKER GRILL

1

PCS

IRPFAAA2

LCD TV 20" IR BOARD

1

PCS

KEPFAAKA1

KEY BOARD

1

PCS

11T 176 1 RL

CABLE MOUNT FTC4

1

PCS

12T 394 3

RUBBER FOOT

10

PCS

15T6184 1

Kensington lock

1

PCS

15T8153 1

BKT-HINGE

1

PCS

15T8154 1

BKT-BASE1

1

PCS

33T4822ARG 1L

ID2 KEYPAD COVER

1

PCS

33T4825 PO L

ID FUN KEY

1

PCS

33T4826 PO L

ID2 COVER POWERKEY

1

PCS

33T4827 1 C

ID2 LENS

1

PCS

33T4828 ED C

REMOTE LENS

1

PCS

33T4832 RG L

CLIP CABLE

1

PCS

33T4837 RG L

STAND TOP

1

PCS

34T1528 GM 3L

REAR COVER

1

PCS

34T1531 RG L

STAND

1

PCS

34T1532 RG L

BASE-1

1

PCS

37T 525 2

HINGE

1

PCS

52T6025 16 C

PC PLATE ON TOP

1

PCS

78T 443500 L

SPEAKER 8OHM 5W

1

PCS

78T 443500 R

SPEAKER 8OHM 5W

1

PCS

M1T 330 4128

SCREW

3

PCS

Q1T 130 8120

SCREW

10

PCS

Q1T 140 16120

SCREW

4

PCS

Q1T 330 8120

SCREW 3X8mm

1

PCS

Q1T 330 8120

SCREW 3X8mm

4

PCS

Q1T1040 10128

SCREW

8

PCS

W33T4836 RG L

STAND MID

1

PCS

SMTIRPFAAA2

IR BOARD SMT

1

PCS

CN1

33T3802 5

AUDIO IN

1

PCS

U4

56T 627 5

TSOP4833

1

PCS

R103

61V0603101

CHIPR 100 OHM+-5% 1/10W

1

PCS

C103

65T0603101 32

CHIP 100PF 50V X7R

1

PCS

C101

65T0603104 32

CHIP 0.1UF 50V X7R

1

PCS

C102

65T0603104 32

CHIP 0.1UF 50V X7R

1

PCS

FB101

71T 59B601 EA

CHIP BEAD 600OHM 0603 T

1

PCS

FB102

71T 59B601 EA

CHIP BEAD 600OHM 0603 T

1

PCS

715V1658 1

IR BOARD

1

PCS

SMTKEPFAAKA1

KEY BOARD SMT

1

PCS

CN1

33T3802 6H

WAFER 6P RIGHTY ANGLE

1

PCS

SW101 77G 600 1GCJ

TACT SWITCH TSPB-2

1

PCS

SW102 77G 600 1GCJ

TACT SWITCH TSPB-2

1

PCS

SW103 77G 600 1GCJ

TACT SWITCH TSPB-2

1

PCS

SW104 77G 600 1GCJ

TACT SWITCH TSPB-2

1

PCS

SW105 77G 600 1GCJ

TACT SWITCH TSPB-2

1

PCS

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Summary of Contents for A20S431

Page 1: ...HESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS RELIABILITY FOR CHANGES ERRORS OR OMISSIONS ...

Page 2: ...AOC A20S431 1 Revision List Version Release Date Revision Instructions TPV Model A00 Oct 10 2005 Initial Release EAA5MNNKC3ACTM ...

Page 3: ... 2 3 Storage Precaution 13 2 4 High Voltage Warning 13 3 Mechanical Instructions 14 4 BOM List 18 5 Trouble Shooting 38 6 PCB Layout 42 6 1 Main Board 42 6 2 Power Board 44 6 3 Tuner Board 45 6 4 Key Board 46 6 5 IR Board 47 6 6 Headphone Board 48 7 Block Diagram 49 7 1 Main Board 49 7 2 Power Board 50 7 3 Exploded View 51 8 Schematic Diagram 53 8 1 Main Board 53 8 2 Power Board 60 8 3 Tuner Board...

Page 4: ...ems NTSC DPF function Optional Supported by memory card Not supported Wireless earphone Optional FM transmission frequency Not supported Video Inputs AV S VIDEO RCA x 1 Audio L R x 1 Share S Video x 1 Audio Output Audio Output L R Speaker built in Two 2 watt speakers Headphone Mini jack for stereo 3 5ø OSD language English French Spanish Portuguese Table Stand Included Wall Mount VESA 100 x 100 mm...

Page 5: ...ume PC No Supported SLEEP With this key you can set a time period after which the TV should switch itself to standby Press the key repeatedly to select the number of minutes The counter runs from 30 60 90 120 minutes PIP Not Supported POP Not Supported MUTE Temporarily interrupt the sound or restore it DISPLAY Press this button to display Channel number on the right top corner MTS SAP Press this k...

Page 6: ...tup 1 Volume is adjusted from 0 to 100 2 Bass and Treble are adjusted from 0 to 100 You can adjust picture Volume Bass and Treble to the levels you prefer 3 The adjustment range of balance is from 0 to 100 0 to 50 is used to adjust the volume of right speaker from low to loud 50 to 100 is used to adjust the volume of left speaker from loud to low 4 The Mute is ON or OFF and if the Mute is ON there...

Page 7: ...ned to help the hearing impaired this feature uses on screen text boxes to show dialogue and conversations wile the TV program is in progress Captions will appear on the screen only during captioned broadcasts Remark the captions do not always use correct spelling and grammar Not all TV programs and product commercials are made for broadcast with Closed Caption information included Refer to your a...

Page 8: ...ing can be blocked by the type of program and by the categories chosen be blocked It is also possible to block all program viewing for a time period A There are two items could be defined One is TV Guidelines another one is Movie Guidelines B Setting up TV Guidelines Use Up Down arrow buttons to move around the matrix and press Right arrow button to change the value form U to B or B to U U Unblock...

Page 9: ... new one After that COMFIRM NEW PIN Picture Setup 1 Contrast Brightness and Saturation are adjusted from 0 to 100 2 Hue is adjusted from 0 to 100 3 Sharpness is adjusted from 0 to100 Hue is only adjusted in NTSC telecast system You can adjust contrast brightness saturation hue black level and sharpness to the levels you prefer 4 Color Tone is for AV S VIDEO and TV color you can select warm or cool...

Page 10: ...e of video and audio equipment that can be connected to your TV The following connection diagrams show you how to connect them PREPARATION Remove the back plate at the back of the TV as shown on the illustration opposite Lay the LCD TV with the screen down on a table as it will be easier to connect your peripheral equipment Please take precaution not to damage the screen RF TV port Earphone output...

Page 11: ...DVD player to the video input port of TV Connect the left and right audio of DVD to the left and right channels of audio input of TV If your DVD player is equipped with S VHS video port For better quality picture please connect the S video cable to the S video input port of TV Connecting the audio output ports through audio cable is a must since S video input port is not attached with audio How to...

Page 12: ...ephone warning To avoid disturbances in picture and sound malfunctioning of your TV or even damage to the TV keep away your mobile telephone from the TV End of life directives We are paying a lot of attention to produce environmentally friendly in green focal areas Your new receiver contains materials that can be recycled and reused At the end of its life specialized companies can dismantle the di...

Page 13: ...oard and transmitting TTL level signals into LCD Module to drive the LCD display circuit The inverter board will drive the six CCFLs Cold Cathode Fluorescent Tube The switching power board will provides the power ON OFF to control the TV and control LED indicator for DPMS The function keyboard and Remote Control will provide the OSD control signal to the Main Board 1 3 Interface Connector 1 RF TV ...

Page 14: ...sure to unplug the power cord before remove the rear cover Be sure the power is turn off Please do not change variable resistance settings in main board they are adjusted to the most suitable value If they are changed it might happen LUMINANCE does not satisfy the white balance spec Please consider that LCD backlight takes longer time to become stable of radiation characteristic in low temperature...

Page 15: ...AOC A20S431 14 3 Mechanical Instructions 1 Lay TV on a flat soft and clean surface 2 Remove the 4 screws to remove stand and base 3 Remove the 8 screws to remove rear cover ...

Page 16: ...AOC A20S431 15 4 Remove 3 screws to remove BKT CARD READER 5 Remove 3 screws to remove shield 6 After removing the shield disconnect the connecter wire with BKT CARD READER and power board ...

Page 17: ...AOC A20S431 16 7 Disconnect the 20 pin header and remove the 1 screw to remove tuner board 8 Disconnect the connector wire 9 Remove the 4 screws and disconnect the connector wire to remove main board ...

Page 18: ...AOC A20S431 17 10 Remove the 6 screws to remove power board 11 Remove the 11 screws to remove key board and two speakers ...

Page 19: ...5T 88626 4 PE BAG FOR MONITOR 1 PCS 50T 500 1 CABLE TIE 6 PCS 50T 500509 CABLE TIE 2 PCS 52T 1186 SMALL TAPE 10 CM 52T 1209500 ALUMINIUM TAPE 1 PCS 52T 1211 A ADHESIVE TYPE 4 PCS 52T6020 6 PROTECT FILM 1 PCS 85T 689 4 SHIELD COVER 1 PCS 89T176J 50514 FFC CABLE 5OP 1 PCS 89T401A18NHR5 POWER CORD 1 PCS 92TB1JX1A31GF BATTERY 2 PCS 95T8014 2505 RIGHT SPERKER HARNESS 1 PCS 95T8014 3517 LEFT SPERKER HAR...

Page 20: ...CS C428 67T309V470 3 47UF 16V 85C 1 PCS C438 67T309V470 3 47UF 16V 85C 1 PCS CN103 88T 78 13 2C RCA JACK 1 PCS CN104 88T 100 6 TO 4PIN MINI DIN JACK 1 PCS X401 93T 2251B J NXS12 000AC30F BT 2 1 PCS X201 93T 2265B J 20 250 AE13F BK4 1 PCS 715V1618 1 PCB 1 PCS CN115 33T8019 50 CONNECTOR 50P 1 PCS ZD407 56T 158501 AZ431AN AE1 1 PCS U401 56T 562503 NT68521 E 1 PCS U101 56T 563 25 AIC1084 33PE 1 PCS U1...

Page 21: ...0603101 CHIPR 100 OHM 5 1 10W 1 PCS R457 61V0603101 CHIPR 100 OHM 5 1 10W 1 PCS R113 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R213 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R214 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R215 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R314 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R401 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R406 61V0603102 CHIPR 1K OHM 5 1 10W 1 PCS R422 61V0603102 CHI...

Page 22: ... PCS R218 61V0603472 CHIP 1 7K OHM 1 16W 1 PCS R402 61V0603472 CHIP 1 7K OHM 1 16W 1 PCS R416 61V0603472 CHIP 1 7K OHM 1 16W 1 PCS R417 61V0603472 CHIP 1 7K OHM 1 16W 1 PCS R423 61V0603472 CHIP 1 7K OHM 1 16W 1 PCS R426 61V0603472 CHIP 1 7K OHM 1 16W 1 PCS R103 61V0603473 CHIP 47K OHM 1 16W 1 PCS R106 61V0603473 CHIP 47K OHM 1 16W 1 PCS R108 61V0603473 CHIP 47K OHM 1 16W 1 PCS R403 61V0603473 CHIP...

Page 23: ...P 0 01UF 50V X7R 1 PCS C239 65T0603103 32 CHIP 0 01UF 50V X7R 1 PCS C441 65T0603103 32 CHIP 0 01UF 50V X7R 1 PCS C442 65T0603103 32 CHIP 0 01UF 50V X7R 1 PCS C443 65T0603103 32 CHIP 0 01UF 50V X7R 1 PCS C444 65T0603103 32 CHIP 0 01UF 50V X7R 1 PCS C445 65T0603103 32 CHIP 0 01UF 50V X7R 1 PCS C446 65T0603103 32 CHIP 0 01UF 50V X7R 1 PCS C447 65T0603103 32 CHIP 0 01UF 50V X7R 1 PCS C305 65T0603104 1...

Page 24: ...04 32 CHIP 0 1UF 50V X7R 1 PCS C432 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C433 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C434 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C435 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C437 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C439 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C440 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C448 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C449 65T0603104 3...

Page 25: ... 80 1 PCS C213 65T0805102 32 CHIP 1000P 50VX7R 0805 1 PCS C301 65T1206106 05 CHIP 10UF 6 3V X5R 1 PCS C304 65T1206106 05 CHIP 10UF 6 3V X5R 1 PCS C302 65T1206106 17 CHIP 10UF 16V Y5V 1 PCS C309 65T1206106 17 CHIP 10UF 16V Y5V 1 PCS CP203 65V602K220 8T IRRAY CAP 22PF 10 16 1 PCS CP204 65V602K220 8T IRRAY CAP 22PF 10 16 1 PCS CP205 65V602K220 8T IRRAY CAP 22PF 10 16 1 PCS CP206 65V602K220 8T IRRAY C...

Page 26: ...OARD FOR SMT 1 PCS CN201 33T8021 2D U 3 5mm WAFER 1 PCS CN202 33T8021 2D U 3 5mm WAFER 1 PCS CN203 33T8021 2D U 3 5mm WAFER 1 PCS CN204 33T8021 2D U 3 5mm WAFER 1 PCS CN205 33T8021 2D U 3 5mm WAFER 1 PCS CN206 33T8021 2D U 3 5mm WAFER 1 PCS CN902A 33T8029 3A WAFER 2P 3 96MM 1 PCS CN902B 33T8029 3A WAFER 2P 3 96MM 1 PCS 40T 45762420A S N LABEL 1 03 PCS IC902 56T 139 3A PC123Y22FZOF 1 PCS VAR901 61T...

Page 27: ...P MAX 0R 1 PCS F903 61L1206000 RST SM 1206 JUMP MAX 0R 1 PCS R210 61V0805619 0F CHIP 619 OHM 1 1 8W 1 PCS R212 61V0805619 0F CHIP 619 OHM 1 1 8W 1 PCS R219 61V0805619 0F CHIP 619 OHM 1 1 8W 1 PCS R233 61V0805619 0F CHIP 619 OHM 1 1 8W 1 PCS R234 61V0805619 0F CHIP 619 OHM 1 1 8W 1 PCS R244 61V0805619 0F CHIP 619 OHM 1 1 8W 1 PCS PW2066CM1AI 20 POWER BOARD FOR AI 1 PCS IC901 56T 379 33 SG6841SZ 1 P...

Page 28: ...03103 CHIPR 10K OHM 5 1 10W 1 PCS R207 61V0603103 CHIPR 10K OHM 5 1 10W 1 PCS R209 61V0603103 CHIPR 10K OHM 5 1 10W 1 PCS R226 61V0603105 CHIP 1MOHM 1 16W 1 PCS R232 61V0603105 CHIP 1MOHM 1 16W 1 PCS R237 61V0603105 CHIP 1MOHM 1 16W 1 PCS R240 61V0603105 CHIP 1MOHM 1 16W 1 PCS R242 61V0603105 CHIP 1MOHM 1 16W 1 PCS R246 61V0603105 CHIP 1MOHM 1 16W 1 PCS R248 61V0603105 CHIP 1MOHM 1 16W 1 PCS R251 ...

Page 29: ... 1 PCS R928 61V0805203 CHIPR 20KOHM 5 1 8W 1 PCS R923 61V0805222 CHIP 2 2KOHM 5 0805 1 1 PCS R911 61V0805240 2F CHIP 24KOHM 1 1 8W 1 PCS R927 61V0805243 1F CHIP 2 43K OHM 1 8W 1 1 PCS R112 61V0805272 CHIP 2 7K OHM 1 8W 1 PCS R916 61V0805472 CHIRP 4 7K OHM 5 1 8 1 PCS R918 61V0805472 CHIRP 4 7K OHM 5 1 8 1 PCS R926 61V0805931 1F CHIP 9 31K OHM 1 8W 1 1 PCS J203 61V1206000 CHIP 0 OHM 1 8W 1 PCS J222...

Page 30: ...5T0603103 32 CHIP 0 01UF 50V X7R 1 PCS C251 65T0603103 32 CHIP 0 01UF 50V X7R 1 PCS C211 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C228 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C234 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C241 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C244 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C247 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C249 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C252 65T...

Page 31: ...32 CHIP 0 1U 50V X7R 1 PCS C918 65T0805104 32 CHIP 0 1U 50V X7R 1 PCS C924 65T0805104 32 CHIP 0 1U 50V X7R 1 PCS C223 65T0805105 22 CHIP 1UF 25V X7R 0805 1 PCS C909 65T0805201 32 CHIP 200PF 50V MPO 0805 1 PCS C222 65T0805221 31 220PF 50V NPO 1 PCS C913 65T1206102 72 CHIP 1000PF 500V X7R 1 PCS C203 65T1206475 12 CHIP 4 7UF 16V 1206 1 PCS C206 65T1206475 12 CHIP 4 7UF 16V 1206 1 PCS C236 65T1206475 ...

Page 32: ...ET 2 PCS PT205 6T 31502 1 5MM RIVET 2 PCS PT206 6T 31502 1 5MM RIVET 2 PCS Q901 6T 31502 1 5MM RIVET 1 PCS T901 6T 31502 1 5MM RIVET 4 PCS C922 67T 2154797NT LOW ESR 4 7UF 20 50V 1 PCS R915 61T 17230352T 30K OHM5 1 4W 1 PCS FB101 71T 55 29 BEAD 1 PCS J957 71T 55 29 BEAD 1 PCS D201 93T 521ZJ26T SB240 1 PCS D202 93T 521ZJ26T SB240 1 PCS D206 93T 521ZJ26T SB240 1 PCS D207 93T 521ZJ26T SB240 1 PCS D21...

Page 33: ...7 67T309V100 3 10uf _20 16v 1 PCS C684 67T309V100 3 10uf _20 16v 1 PCS C692 67T309V100 3 10uf _20 16v 1 PCS C656 67T405V100 3P 10UF 16V 1 PCS C615 67T405Y1013PV E CAP 100UF 1 PCS X601 93T 2268B J 18 432MHZ 1 PCS TU100 94VNTSC M 1F TSVN1 P91FR3 2IN1 TV TU 1 PCS U602 56T 133 30AAC AZ1117H 1 8 E1 1 PCS U605 56T 593 4 MSP3425G QI B8 V3PMQFP6 1 PCS U606 56T 616 7 TPA3002D2PHPRG4 HTQFP 4 1 PCS U607 56T ...

Page 34: ...43 CHIP 24K OHM 1 10W 1 PCS R603 61V0603330 CHIP 33 OH 1 16W 1 PCS R642 61V0603330 CHIP 33 OH 1 16W 1 PCS R625 61V0603471 CHIPR 470 OHM 5 1 10W 1 PCS R626 61V0603471 CHIPR 470 OHM 5 1 10W 1 PCS R650 61V0603472 CHIP 1 7K OHM 1 16W 1 PCS R651 61V0603472 CHIP 1 7K OHM 1 16W 1 PCS R636 61V0603473 CHIP 47K OHM 1 16W 1 PCS R637 61V0603473 CHIP 47K OHM 1 16W 1 PCS R608 61V0603621 CHIP 620 OHM 1 16W 1 PCS...

Page 35: ...65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C682 65T0603104 32 CHIP 0 1UF 50V X7R 1 PCS C605 65T0603105 12 CHIP 1UF 16V X7R 1 PCS C606 65T0603105 12 CHIP 1UF 16V X7R 1 PCS C608 65T0603105 12 CHIP 1UF 16V X7R 1 PCS C609 65T0603105 12 CHIP 1UF 16V X7R 1 PCS C610 65T0603105 12 CHIP 1UF 16V X7R 1 PCS C630 65T0603105 12 CHIP 1UF 16V X7R 1 PCS C693 65T0603105 12 CHIP 1UF 16V X7R 1 PCS C695 65T0603105 12 CHIP...

Page 36: ... 71T 56G301 EA CHIP BEAD 300 OHM 0805 1 PCS FB613 71T 56G301 EA CHIP BEAD 300 OHM 0805 1 PCS L601 71T 56G301 EA CHIP BEAD 300 OHM 0805 1 PCS L602 71T 56G301 EA CHIP BEAD 300 OHM 0805 1 PCS L603 71T 56G301 EA CHIP BEAD 300 OHM 0805 1 PCS L604 71T 56G301 EA CHIP BEAD 300 OHM 0805 1 PCS D601 93T 6432V LL4148 GSO8 SMD BY VISH 1 PCS 715V1619 1 TUNER BOARD 1 PCS HJPFBAA1 HEAD PHONE JACK BOARD 2 1 PCS 15...

Page 37: ... PCS M1T 330 4128 SCREW 3 PCS Q1T 130 8120 SCREW 10 PCS Q1T 140 16120 SCREW 4 PCS Q1T 330 8120 SCREW 3X8mm 1 PCS Q1T 330 8120 SCREW 3X8mm 4 PCS Q1T1040 10128 SCREW 8 PCS W33T4836 RG L STAND MID 1 PCS SMTIRPFAAA2 IR BOARD SMT 1 PCS CN1 33T3802 5 AUDIO IN 1 PCS U4 56T 627 5 TSOP4833 1 PCS R103 61V0603101 CHIPR 100 OHM 5 1 10W 1 PCS C103 65T0603101 32 CHIP 100PF 50V X7R 1 PCS C101 65T0603104 32 CHIP ...

Page 38: ...CS SW107 77G 600 1GCJ TACT SWITCH TSPB 2 1 PCS D1 81T 12 2 GP GP36032ME 50 ZO 1 PCS R101 61V0805221 1F CHIP 22KOHM 1 PCS R103 61V0805221 1F CHIP 22KOHM 1 PCS R102 61V0805511 1F CHIP 51K OHM 1 PCS R104 61V0805511 1F CHIP 51K OHM 1 PCS 715V1453 1 K2 PCB 1 PCS ...

Page 39: ...cking Dot Defect Brightness Spot Dot Defect Particle Check Panel Panel Change No display Check Power Board Check Main board Check Panel Change Panel Change Main board Change Power Board Check Keyboard Change Keyboard Check Line Connected Power board and Minored Change Wires Noise Check Main board Check Panel Change Main board Change Panel Test A Abnormal Display ...

Page 40: ...Panel Check LVD Cable Change LVDS Cable R G B Display Abnormal Check Single Cable Change Single Cable Check Main board Change Main board Check Panel Change Panel Monitor Shut Down Check Power board Change Power board Check Keyboard Change Keyboard Check Main board Change Main board No signal Check Single Cable Change Single Cable Check Main board Change Main board Power on Display Abnormal Check M...

Page 41: ...hange Main board Change LVDS Wire LED Off Change Keyboard or Main board or wire Change Keyboard or Main board or wire A Change Wires LED Abnormal LED Dark LED Display Abnormal LED Flicker Abnormal Keyboard Check Wires Check Keyboard Check Main board Abnormal OSD Check Main board Check LVDS Wire Test Next step Completed ...

Page 42: ...Board OSD is unstable or not working Is Key Pad Board connecting normally Connect Key Pad Board Is Button Switch normally Replace Button Switch Y N N Is Key Pad Board Normally Replace Key Pad Board Y N Y Check Main Board ...

Page 43: ...AOC A20S431 42 6 PCB Layout 6 1 Main Board ...

Page 44: ...AOC A20S431 43 ...

Page 45: ...AOC A20S431 44 6 2 Power Board ...

Page 46: ...AOC A20S431 45 6 3 Tuner Board ...

Page 47: ...AOC A20S431 46 6 4 Key Board ...

Page 48: ...AOC A20S431 47 6 5 IR Board ...

Page 49: ...AOC A20S431 48 6 6 Headphone Board ...

Page 50: ... 240V U401 NT68521 E Scaler OSD 20 inch TTL Panel U405 24LC16 EEPROM Key PAD VIDEO 1 S VIDEO U201 VPC 3230 Decoder Philips Tuner FQ1236 MK3 ANT INT U402 NT68F632A MCU Audio 1 TV audio TPA3002D2 Audio AMP Headphone SDA SCL IR Tuner SDA Tuner SCL U301 V CHIP Z86129 TPA6110A 2DGNR U605 MSP 3425G AUDIO Decoder ...

Page 51: ...AOC A20S431 50 7 2 Power Board 20 AOC TV Power Block ...

Page 52: ...AOC A20S431 51 7 3 Exploded View ...

Page 53: ...1530 COVER_HINGE 1 38 M1V1730 6128 MAINBRD MAIN FRAME 4 13 34T1522 HANDLE 1 39 M1V1140 6128 GROUND 1 14 34T1532 BASE 1 1 40 M1V 1030 20128 PANEL U MAIN FRAME 4 15 34T1531 STAND 1 41 Q1V 130 8120 BKT BASE BASE 10 16 33T4836 STAND_MID 1 42 Q1V 140 20120 HINGE STAND 4 17 33T4837 STAND_TOP 1 43 Q1V 330 8120 REMOTE BRD BEZEL 1 18 33T4832 CLIP CABLE 1 44 M1V 330 4128 HINGE CV ST M 3 19 36T426 1 SPEAKER ...

Page 54: ... 0 1 3 2 2 2 3 2 4 26 38 5 1 27 28 29 30 33 4 3 5 3 35 34 5 2 6 3 5 8 36 32 31 8 9 1 0 1 2 1 4 1 7 1 9 2 1 25 37 39 40 4 1 4 2 4 4 4 5 4 6 4 7 4 8 4 9 5 0 5 7 5 6 5 5 5 4 6 2 6 1 6 0 5 9 67 66 65 6 4 68 72 71 70 69 73 74 75 76 77 79 78 80 B1 Cb 1 IN G 1 Y1 IN R1 Cr 1 IN B2 Cb 2 IN G 2 Y2 IN R2 Cr 2 IN ASG F TEST RESQ YCO EQ G NDD FFWE SCL FFRE FFO E CL K2 0 VSUPPA Y2 G NDSY LLC2 LLC1 VSUPLLC GNDLL...

Page 55: ...6 0 1u V_B AGN D R 305 22k AGN D IIC SC L R 310 10k C 314 0 1u R 308 75 EMI R 306 470 AGN D C 311 560p C 301 10u 16V D GN D R 309 75 C 315 560pF Q301 PMBS3904 3 2 1 5VS C 302 10u 16V FB301 B0805 600 FB V CHIP MFM A4 2 Monday September 12 2005 Title Siz e D oc ument N umber D ate Sheet of AGN D VD _H S TO 3230D C 309 10u R 303 470 C 308 0 1u R 312 470 5VS C 310 0 1u C 312 0 68u R 314 1k AGN D R 307...

Page 56: ... A20S431 55 IICSCL IICSDA TUNER_CTRL MUTE SEL2 STANDBY TUNER_DET 5V AUDIO_O_L TUNER_CVBS DGND 12V AUDIO_O_R CN113 8x2PIN 2 0mm 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 17 18 19 20 VOLUME SEL1 FB409 0 FB408 0 ...

Page 57: ...6V ZD 401 5 6V MC U _VD D SC L SD A D D C _SD A W P R 407 100k IIC SC L PW R _LED G R 428 7 5k R 405 100k R 430 N C C 414 1n C 411 1n ZD 403 5 6V C 410 0 22u R 401 1k 5V IIC SD A R 412 100 R 434 100 C 407 100p D GN D 5V SC L PW R 2_EN D D C _SC L SC L ZD 406 5 6V D D C _VD D Q401 MMBT3904 1 3 2 MC U _VD D TU N ER _C TR L D GN D R 420 2k C 413 1n M_R XD R 425 15k R 419 2k U 405 AT24C 16 1 2 3 4 5 6...

Page 58: ... 2 3 4 5 6 7 8 L P4 1 2 0 O HM 8 P4 R 1 2 3 4 5 6 7 8 D ISP_C LK R7 G 5 C P208 22pF 1 2 3 4 5 6 7 8 G 3 R1 G 0 7 D GN D G 4 EMI B7 L P2 1 2 0 O HM 8 P4 R 1 2 3 4 5 6 7 8 L P5 1 2 0 O HM 8 P4 R 1 2 3 4 5 6 7 8 R6 C P206 22pF 1 2 3 4 5 6 7 8 R3 D GN D G 7 G 0 D ISP_VS D GN D B4 R5 C N 115 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 3 ...

Page 59: ...R N 2 T6M R A4 AR SR P 2 T5P R A3 AR SR N 1 T5M R A2 AR SR P 1 T4P R A1 AR SR N 0 T4M R A0 AR SR P 0 T1M GA0 AR SGP 0 T1P GA1 AR SGN 0 T2M GA2 AR SGP 1 T2P GA3 AR SGN 1 TC LK1M GA4 AR SGP 2 TC LK1P GA5 AR SGN 2 T3M GA6 AR SGP 3 T3P GA7 AR SGN 3 BA0 AR SBP 0 BA1 AR SBN 0 BA2 AR SBP 1 BA3 AR SBN 1 BA4 AR SBP 2 BA5 AR SBN 2 T0M BA6 AR SBP 3 T0P BA7 AR SBN 3 C LKB BR SC LK_N POLB BR SC LK_P T7P C LKA ...

Page 60: ... Sheet of C 114 0 1u SANKEN8050 SI8050 R101 10n Q105 AO4411 1 2 3 4 5 6 7 8 S S S G D D D D FB103 B1206 600 D GN D PAN EL_VD D C 121 0 1u CONNECTOR FOR POWER INVERTER BOARD 2 0 mm 3 3V C 104 0 1u D GN D 5V FB107 B1206 600 R 103 47k C 105 0 1u 3 3VS C 124 1u D GN D D GN D R 108 47k C 663 0 068u C 109 220p 0 OHM 3 3VS for VPC3230D 5V R 101 10n 0 5V 12V 2 5V R 105 100k D GN D D GN D C 112 100u 16V Q1...

Page 61: ...AOC A20S431 60 8 2 Power Board ...

Page 62: ...AOC A20S431 61 ...

Page 63: ...AOC A20S431 62 ...

Page 64: ...GND 5VT GND R641 100 TUNER_SDA R605 0 1 16W GND C669 100uF 16V C670 0 1u R606 220 1 16W TU100 TUNER 1 2 3 11 12 13 14 18 15 16 17 4 5 6 9 10 NC AGC NC Monitor VCC SIF CVBS VCC IF AF O P CHASSIS CHASSIS CHASSIS CHASSIS SCL SDA AS NC NC C665 100uF 16V GND FB612 600 OHM GND Q601 PMBS3904 3 2 1 R604 NC C668 0 1u R603 33 FB613 600 OHM R642 33 C607 NC GND C667 100uF 16V R602 0 1206 NC GND TUNER_SIF ...

Page 65: ...PIN 2 0mm 1 3 5 7 9 11 13 15 2 4 6 8 10 12 14 16 18 17 19 20 AMP_MUTE R636 47k Q602 PMBS3904 3 2 1 5VA TUNER_EN R638 22k C613 100u 16V TUNER_SCL AMP_VOLUME C662 1u 12VT 5V U602 AZ1117H ADJ 3 2 1 VI VO ADJ Q604 PMBS3904 3 2 1 C614 0 1u C619 0 1u TUNER_SDA Q603 AO3401 FB602 300 OHM R639 22k 12V C615 100u 16V decrease MSP3455G consumption in power saving ASEL_O_L R635 22k C618 0 1u Q605 AO3401 R607 1...

Page 66: ...OU T N C VC LAMPR BSRP PVCCR PVCCR RO UTP RO UTP PG NG R PG NG R RO UTN RO UTN PVCCR PVCCR BSRN LIN N AVddR EF VR EF VAR D IFF AGN D VAR MAX AGN D VOLU ME R EFGN D R 659 120K 1 16W Low mute High aitve GN D R OU T R 656 0 1 8W R 655 0 1 8W AGN D WL_POWER High Wireless phone ON Low OFF R 669 10K 1 16W C N 602 R SPEAKER 1 2 AMP_STBY R 670 10K 1 16W R 654 0 R 664 10K 1 16W AGN D L604 300 OH M C 694 0 ...

Page 67: ...OU T I2S_D A_IN 1 AD R _D A AD R _W S AD R _C L D VSU P D VSS I2S_D A_IN 2 N C N C N C R ESETQ NC NC VREF2 DACM_ R DACM_ L NC NC NC NC NC VREF1 SC1 _ O UT_ R SC1 _ O UT_ L NC AHVSUP CAPL _ M AH VSS AGN D C N C N C N C N C N C ASG SC 2_IN _L SC 2_IN _R ASG SC 1_IN _L SC 1_IN _R VR EFTOP MON _IN AVSS AVSUP ANA_ IN1 ANA_ IN NC TESTEN XTAL _ IN XTAL _ O UT TP NC NC NC D_ CTR_ I O UT1 D_ CTR_ I O UT0 A...

Page 68: ...02 5 1k K_AD1 MENU POWER SW107 K_GND D101 LED SW101 RED CH_DN 715T1453 A K2 R101 2 2k K_AD0 CH_UP CN102 4PIN 2 0mm 3 4 1 2 5 6 R103 2 2k SW106 R104 5 1k Doc Rev Code Title A 1 1 Wednesday August 17 2005 Title Size Document Number Rev Date Sheet of VOL_UP PWR SW103 ...

Page 69: ...2 0 C102 0 1uF CN103 CONN 1 2 3 4 5 Doc Rev Code Title A 1 1 Tuesday August 02 2005 Title Size Document Number Rev Date Sheet of GND D102 1 3 2 DATA VCC GND FB102 600 OHM R103 150 OHM 5VP R101 0 IR_OUT FB101 600 OHM C101 0 1uF 715T1658 C C103 100pF ...

Page 70: ...adphone Board Doc Rev Code Title A 1 1 Tuesday September 06 2005 Title Size Document Number Rev Date Sheet of FB3 0 CN2 PHONEJACK 1 3 5 2 4 7 6 CN1 4 HEADER 2 3 4 1 5 GND FB4 0 R C3 2 2UF 16V C4 2 2UF 16V L 715T1381 1B MODE ...

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