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AOC M20S651B, Service Manual

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AOC M20S651B Service Manual Download Page 25

20

’’ LCD TV Color Monitor                                                                                          AOC M20S651B   

 

25 

5.6 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 

OK 

Is Key Pad Board Normally?

 

Replace Key Pad Board

 

Check Main Board

 

NG 

NG 

OK 

OK 

NG 

Summary of Contents for M20S651B

Page 1: ...wer Board 28 6 3 Key Board 29 6 4 Tuner Board 30 6 5 Earphone board 31 7 Block Diagram 32 7 1 Main Board 32 7 2 Power Board 33 8 Schematic Diagram 34 8 1 Main Board 34 8 2 Power Board 46 8 3 Key Board...

Page 2: ...20 LCD TV Color Monitor AOC M20S651B 2 Revision List Version Release Date Revision History TPV Model A00 Nov 08 2006 Initial Release E206CHNBD1ACNP...

Page 3: ...characteristics may create shock fire or other hazards Under no circumstances should the original design be modified or altered without written permission from AOC AOC assumes no liability express or...

Page 4: ...5 TV Function TV Standard SECAM PAL Color systems SECAM L L PAL BG DK I Sound System Mono Nicam stereo A2 Video Input AV RCA x 1 Audio L R x 1 S VIDEO S Videox 1 SCART CVBS RGB Audio output Audio out...

Page 5: ...ered off unless it is physically unplugged TV VIDEO Select your input source press repeatedly to select TV AV S VIDEO or SCART mode according to where you connected your external source PIP POP PIP PO...

Page 6: ...text part the lower teletext part and then to return to the normal RED GREEN YELLOW BLUE Use the COLOURED BUTTONS to operate the Teletext screen INDEX Press INDEX to return to the main index page SUBT...

Page 7: ...o confirm your function selection and adjustment volume Source Key Press to select your input source Lay the LCD TV with the screen down on a table as it will be easier to connect your peripheral equi...

Page 8: ...elow Sound Setup Same as in PC TV AV1 S Video and AV2 SCART 1 The range of adjusting volume bass and treble is from 0 100 2 Select ON or OFF in sound selection to control the sound output 3 Bass and T...

Page 9: ...to 50 3 Video noise There are two options Phase and Clock which can be adjusted from 50 to 50 4 Sharpness Select from five options of Softest Soft Auto Sharp and Sharpest You may adjust the above opt...

Page 10: ...age options provided English France Deutsch Spanish Portugese Polish Russian Italian Finnish Swedish 3 Timers 1 Sleep Timer Set the sleeping timer and the alert function which indicates the time left...

Page 11: ...m select the colour and sound system the current channel you can selet auto the set will identify it by oneself 4 Auto search Select Auto Search to search all signaled channel when the searching is co...

Page 12: ...he PLAY button How to connect 1 The SCART socket can be connected a VCR a camcorder a DVD player a satellite receiver a decoder or a game console form SCART cable 2 The 21pin SCART socket can also be...

Page 13: ...TV by wiping the screen and the cabinet with a soft clean cloth If the screen requires additional cleaning use a clean damp cloth Do not use liquid cleaners or aerosol cleaners Mobile telephone warnin...

Page 14: ...does not have provisions for the grounded type plug the installer should attach the proper adapter to ensure a safe ground potential Connect the 15 pin D SUB color display shielded signal cable to you...

Page 15: ...n show this timing but it is out of range actually T127 800 600 46K 75Hz Can not display this timing show out of range T128 800 600 48K 72Hz can show this timing but it is out of range actually T129 8...

Page 16: ...CD TV Color Monitor AOC M20S651B 16 4 Mechanical Instructions Step Figure Description Preparation and remove the base Remove the screws remarked in red Remove back cover Remove the screws remarked in...

Page 17: ...20 LCD TV Color Monitor AOC M20S651B 17 Remove shield Remove the screws remarked in red...

Page 18: ...20 LCD TV Color Monitor AOC M20S651B 18 Remove the boards and main frame Remove connectors and the screws remarked in red...

Page 19: ...20 LCD TV Color Monitor AOC M20S651B 19 Remove the panel Remove the screws remarked in red The end...

Page 20: ...eck the source Reset source Check LVDS cable NG Replace LVDS cable Check 12V power supply Return to 5 3 Check U406 Replace U406 Check panel Replace panel Check main board power supply Check I 2 C comm...

Page 21: ...Can t start LED indicator yellow NG Repair the keyboard Check 5V_SB Check every chip power supply Check I 2 C communication Check keyboard Replace I 2 C communication component Check oscillistor Repla...

Page 22: ...power cord and interface OK Check F901 BD901 NG Replace F901 or BD901 OK Check the load Check IC901 Q901 NG Replace IC901 or Q901 OK Check T901 NG Replace T901 OK Check D904 D905 Replace D904 D905 NG...

Page 23: ...ilter circuit Replace the filter or inductance Repair each relative circuit Check TU601 Replace TU601 AV S video signal component PC signal Check LVDS cable Replace LVDS cable Replace panel Abnormal d...

Page 24: ...place the filter or inductance Check TU601 Replace TU601 AV component S video PC signal Check Amplifier TDA7266D U601 Replace U601 Check Earphone jack Replace the Earphone jack Check speakers Replace...

Page 25: ...25 5 6 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 OK Is Key Pad Board Normally Replace Key Pad...

Page 26: ...20 LCD TV Color Monitor AOC M20S651B 26 6 PCB Layout 6 1 Main Board...

Page 27: ...20 LCD TV Color Monitor AOC M20S651B 27...

Page 28: ...20 LCD TV Color Monitor AOC M20S651B 28 6 2 Power Board...

Page 29: ...20 LCD TV Color Monitor AOC M20S651B 29 6 3 key Board...

Page 30: ...20 LCD TV Color Monitor AOC M20S651B 30 6 4 Tuner Board...

Page 31: ...20 LCD TV Color Monitor AOC M20S651B 31 6 5 Earphone Board...

Page 32: ...h SST39V F020B SAWFILTER SAWFILTER Video IF Audio IF Audio Output TDA 9178 NC Picture improve YUV output YUV IN HD input RGB Y PR PB PI5V 330W PI5V 330W RGB Gain Input PC Audio Switch 4052 VideoH V Ou...

Page 33: ...M DIM EMI filter Start Circuit R908 R909 R910 PWM Control IC Transformer 12V ON OFF Control PWM Control IC Feedback Circuit Output Circuit Transformer MOSFET Lamp ON OFF Bridge Rectifier and Filter Fe...

Page 34: ...C847B 1 3 2 TV_G R499 4 7k 01 1 YPrPb SWITCH AOC Top Victory Electronics Co Ltd A3 1 14 Tuesday July 25 2006 Title Size Document Number Rev Date Sheet of Q403 BC847B 1 3 2 R492 0 OHM R489 10k R509 nc...

Page 35: ...2 14 15 11 1 5 2 4 6 10 9 13 3 16 8 7 X0 X1 X2 X3 Y0 Y1 Y2 Y3 EN A B X Y VDD GND VEE 5V ON_OFF R551 100 IIC_SEL ISP_SDA R560 2k SCL R540 4 7k R541 4 7k 5V D410 1N4148 5V VSCL VSDA R534 1k 03 1 IIC SWI...

Page 36: ...TV_G R518 75 OHM ZD404 5 6V 1 2 R515 0 D404 BAV99 1 3 2 5V ADC_VAA R531 10K VGA_TV_SW VGA V REF R526 100 B Q412 PMBS3904 3 2 1 C480 1u R548 2 7k REF ZD407 5 6V 1 2 REF REF VGA V REF REF REF FB414 B080...

Page 37: ...M23 VSSP2 VSSC4 VDDC4 VDDA3 VREF_POS_LSL VREF_NEG_LSR HPR VREF_POS_LSR HPR VREF_NEG_HPL HPR VREF_POS_HPR XTALIN XTALOUT VGUARD SWIO DECDIG VP1 PH2LF GND1 SECPLL DECBG EWD AVL VDRB VDRA VIFIN1 VIFIN2...

Page 38: ...Q417 PMBS3904 3 2 1 R227 100 R206 0 R555 100 C317 47pF C261 0 1uF GND4 R266 15K R207 0 R224 100 FOR NTSC SOR1 U409 UR 1 2 3 MOL R559 1k U401D LOCI G24 F25 F24 F23 E25 E24 E23 D24 C24 B24 D23 D22 C22...

Page 39: ...7 10u R235 100 VOUT C212 47pF C281 0 1UF C274 0 1UF FB216 600 SANDC REF C220 100u C283 0 1uF U401E LOCI B17 B16 A16 C15 D15 B15 A15 B14 E26 F26 T25 U24 U23 V24 V23 L16 W24 W23 Y24 Y23 Y25 M16 N16 N15...

Page 40: ...4 PWM3 P2 5 PWM4 VDDC3 VSSC3 P2 2 PWM1 P1 2 INT2 P1 4 RX VDDA1 P1 6 SCL P1 5 TX R310 nc R244 100 FB220 600 SDA 5V WP R249 100 STATAV1 D_DECT3 R270 1K R248 100 FB219 600 R222 10 YUV_TV_SW FB221 600 S_C...

Page 41: ...GPIO 13 SCL GPIO 12 GPIO 4 PWM1 TCP_TDO GPIO 3 TRST VDD_IO1 VSS_CORE7 VSSA_XTAL XTAL1 XTAL0 VDD_XTAL GPIO 2 TCK VSS_CORE6 NC55 GPIO 2 T1 TD1 GPIO 0 T0 TMS T_ENABLE NC41 NC40 NC39 NC38 NC37 NC36 VSS_C...

Page 42: ...4 AD13 AE13 AF13 D1 AB1 AB2 AC1 AC2 AD1 AC3 AE1 AB4 AE2 AD3 AC4 A25 AF2 AE3 AD4 AF3 AC5 AE4 AD5 AF4 AE5 AC6 AF5 AD6 AE6 AC7 AF6 AD7 AE8 AE7 AC8 AD8 AF7 AF8 AC9 AD9 AE9 H2 AC10 AD10 AE10 AF10 AC11 AD11...

Page 43: ...N106 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 R429 0R RP404 22x 1 2 3 4 8 7 6 5 FB405 600 RSP7 DBE6...

Page 44: ..._SW REF ON_OFF Q103 BC557B 3 2 1 8V For TDA9178 Picture improve REF REF REF U105 AP1117E5 0YL 3 2 1 4 VIN VOUT GND CASE DIG2 C155 1u DIG1 R117 2 2 C140 0 22uF C164 0 1u Q108 PMBS3904 3 2 1 3 3Vs_SW Fo...

Page 45: ...ctober 27 2006 Title Size Document Number Rev Date Sheet of C123 100n C109 100n FB113 BLM21A102S C120 100n FB111 BLM21A102S 1 8VS_SW VDDA_PPLL FB114 BLM21A102S C132 100n 3 3V_PLL C112 100n C110 100n R...

Page 46: ...V C921 0 0047uF 250V IC903 H431BA 12V C913 0 001uF D902 PS102R R927 2 4K 1 10W L903 73L 253 91L C916 1000uF 25V D901 FR107 CN901 AC WIRE 1 2 C901 0 001uF 250V 5V 2 INTERNAL POWER FOR PWTV2062MEF1P B 1...

Page 47: ...K 1206 T802 80TL20T 12 DN 6 7 2 1 C820 NC 0603 Q806 NC 3 2 1 2 PWTV2062MEF1P PWTV2062CEF1P AOC Top Victory Electronics Co Ltd Custom 2 3 Thursday October 26 2006 Title Size Document Number Rev Date Sh...

Page 48: ...933 47K 1 16W 5V C941 0 1uF 50V C932 1uF 50V C940 470uF 16V FP5001 IC905 FP5001DR 1 6 7 5 2 8 3 4 Vo DTC RT SCP Vcc GND COMP FB Q905 PMBS3906 3 2 1 R936 15K C929 0 1uF 50V R928 1K 1 16W R929 330 1 4W...

Page 49: ...680 OHM SW04 MODEL_SEL CN02 CONN 1 2 R02 150 OHM SW01 key Board Doc KEY IR BOARD OrgName OrgAddr1 A4 1 1 Monday November 28 2005 Title Size Document Number Rev Date Sheet of SW03 ZD01 5 6V 1 2 POWER S...

Page 50: ...ohm AGND AGND C633 470pF C2IN R622 47K 1 10W R611 3 9K 1 10W SCIR2 L703 120 OHM 1 2 L613 120 OHM 1 2 AGND C629 330pF AGND BIN Q602 PMBS3904 CN602 CONN 21 19 17 15 13 11 9 18 16 14 12 10 8 6 20 4 2 3 1...

Page 51: ...8 10 3 SCL SDA Reserv ed IF1 AGC Vst Vs TU ADC IF2 GND AS TH1 TH2 TH3 TH4 AGND R706 100 1 10W SCL L621 47uH 10 PEAKING COIL R629 0 1 10W C643 10uF 16V C702 0 01uF NC D602 BAV99 3 1 2 AGND C640 0 0047...

Page 52: ...AGND CN606 CONN 1 2 Q601 PMBS3904 L623 0 1 8W R637 100K 1 10W L624 0 1 8W AGND AGND U601 TDA7266D 7 14 9 13 1 10 11 20 2 5 19 16 6 15 8 IN1 IN2 ST_BY S_GND PW_GND PW_GND PW_GND PW_GND OUT1 OUT1 OUT2 O...

Page 53: ...22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 SCOR1 IF SCIL1 FOR EUROPE 1 CONNECTOR AOC Top Victory Electronics Co Ltd A4 2 4 Thursday September 14 2006 Title Size Document Numb...

Page 54: ...UP CN01 CONN 1 2 3 4 5 R04 240 OHM R06 470 OHM C02 0 1uF REMOTE R01 100 FB01 600 OHM 5V SW04 KEYB SW01 Doc Rev Code KEY IR BOARD OrgName OrgAddr1 A4 1 1 Tuesday October 11 2005 Title Size Document Num...

Page 55: ...20 LCD TV Color Monitor AOC M20S651B 55 9 Exploded View...

Page 56: ...30 15 BKT CONNECTOR 11 Q34T1528 GM 5L REAR COVER 12 015T8148 1 ID1_BKT_KEYPAD 13 KEPFAA7P KEY BOARD 14 033T6301A14 2C PC PLATE ON TOP 15 033T4823 P0 L FUN KEY 16 034T1529 GM L COVER HIMGE 17 0Q1T 340...

Page 57: ...E 050T 500 1 CABLE TIE 052T 1185 MIDDLE TAPE FOR CARTON 052T 1186 SMALL TAPE 052T 1209500 ALUMINIUM TAPE 052T6020 6 PROTECT FILM 085T 689 7 SHIELD MAIN 089T176J 50514 FFC CABLE 5OP 089T404A18N IS POWE...

Page 58: ...BACK COVER ASS Y 011T 176 1 RL WIRE HOLDER 015T6184 1 Kensington lock 015T8148 1 ID1_BKT_KEYPAD 015T8153 1 BKT HINGE 033T4823 P0 L FUN KEY 033T6301A14 2C PC PLATE ON TOP 078T 306500 KL SPK 4OHM 5W KU...

Page 59: ...7E50LA ANACHIP U407 056T 614 1 IC 74HC4052D PHILIPS U302 056T 614 1 IC 74HC4052D PHILIPS U404 056T 634 2 PI5V330Q QSOP 16 BY PER U301 056T1133 34 M24C02 WMN6TP U403 056T113353A M24C32 WMN6TP Q107 057T...

Page 60: ...R407 061T0603100 CHIP 10OHM 1 16W R408 061T0603100 CHIP 10OHM 1 16W R525 061T0603101 CHIP 100OHM 1 16W R524 061T0603101 CHIP 100OHM 1 16W R523 061T0603101 CHIP 100OHM 1 16W R522 061T0603101 CHIP 100O...

Page 61: ...50 061T0603101 CHIP 100OHM 1 16W R249 061T0603101 CHIP 100OHM 1 16W R248 061T0603101 CHIP 100OHM 1 16W R247 061T0603101 CHIP 100OHM 1 16W R245 061T0603101 CHIP 100OHM 1 16W R536 061T0603102 CHIP 1K OH...

Page 62: ...R212 061T0603122 RST CHIPR 1 2 KOHM 5 1 10W R213 061T0603122 RST CHIPR 1 2 KOHM 5 1 10W R214 061T0603122 RST CHIPR 1 2 KOHM 5 1 10W R265 061T0603123 RST CHIPR 12 KOHM 5 1 10W R409 061T0603123 RST CHIP...

Page 63: ...R497 061T0603472 CHIP 4 7KOHM 1 16W R540 061T0603472 CHIP 4 7KOHM 1 16W R530 061T0603473 CHIP 47KOHM 1 16W R543 061T0603473 CHIP 47KOHM 1 16W R286 061T0603473 CHIP 47KOHM 1 16W R285 061T0603473 CHIP...

Page 64: ...T0603104 12 MLCC 0603 0 1UF K 16V X7R C277 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C278 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C279 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C248 065T0603104 12 MLCC...

Page 65: ...X7R C118 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C117 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C116 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C115 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C114 065T06...

Page 66: ...17 CHIP 0 22UF 16V Y5V C301 065T0603224 17 CHIP 0 22UF 16V Y5V C299 065T0603224 17 CHIP 0 22UF 16V Y5V C289 065T0603224 17 CHIP 0 22UF 16V Y5V C237 065T0603224 17 CHIP 0 22UF 16V Y5V C141 065T0603224...

Page 67: ...07 065T0603474 17 CHIP 0 47UF 16V Y5V C308 065T0603474 17 CHIP 0 47UF 16V Y5V C244 065T0603682 32 CHIP 0 0068UF 50V X7R 0603 C158 065T0603683 32 CHIP 0 068UF 50V X7R C217 065T0805155 A2 MLCC 0805 1 5U...

Page 68: ...21 8T CHIP BEAD ARRAY 120 OHM RP404 071T 56A121 8T CHIP BEAD ARRAY 120 OHM RP405 071T 56A121 8T CHIP BEAD ARRAY 120 OHM RP406 071T 56A121 8T CHIP BEAD ARRAY 120 OHM FB215 071T 56G301 EA CHIP BEAD 300...

Page 69: ...5 093T 39S 34 T UDZS5 6B ROHM ZD401 093T 39S 34 T UDZS5 6B ROHM ZD402 093T 39S 34 T UDZS5 6B ROHM ZD403 093T 39S 34 T UDZS5 6B ROHM ZD404 093T 39S 34 T UDZS5 6B ROHM ZD405 093T 39S 34 T UDZS5 6B ROHM...

Page 70: ...SW TS 9 TMG 533 SW07 077T 604 2 TO CHIP TACT SW TS 9 TMG 533 ZD01 093T 39S 34 T UDZS5 6B ROHM 715T1822 3 KEY BOARD PCB PWTV2062MEF1P POWER T1811 3 X X 1 060922 CN806 033T8021 2D U 3 5mm WAFER CN805 0...

Page 71: ...S AC SOCKET D901 093T 6026T52T FR107 CN903 095T8013 10610 WIRE HARNESS R914 705G 20 61 04 R914 ASS Y R914 061G152M33858F 0 33 OHM 5 2W 096G 29 6 H S TUBE 705T 20 57 06 Q901 ASS Y Q901 057T 724 11 STP9...

Page 72: ...CHIPR 240 KOHM 5 1 10W R821 061T0603270 2F RST CHIPR 27 KOHM 1 1 10W R837 061T0603274 RST CHIPR 270 KOHM 5 1 10W R934 061T0603300 1F RST CHIPR 3 KOHM 1 1 10W R832 061T0603333 RST CHIPR 33 KOHM 5 1 10W...

Page 73: ...M 5 1 4W R844 061T1206104 RST CHIPR 100 KOHM 5 1 4W R811 061T1206104 RST CHIPR 100 KOHM 5 1 4W R906 061T1206105 RST CHIPR 1 MOHM 5 1 4W R905 061T1206105 RST CHIPR 1 MOHM 5 1 4W R904 061T1206105 RST CH...

Page 74: ...3682 32 CHIP 0 0068UF 50V X7R 0603 C823 065T0805101 32 100PF 10 50V X7R C844 065T0805101 32 100PF 10 50V X7R C925 065T0805103 22 GP CHIP 0 01UF 25V X7R 0805 C941 065T0805104 32 CHIP 0 1U 50V X7R C939...

Page 75: ...6T 158 10 T IC AZ431AZ AE1 TO 92 AAC IC904 056T 158 10 T IC AZ431AZ AE1 TO 92 AAC C906 065T 1K152 1T 1 5NF 1KV Z5F 10 J814 065TUP05473 2T CER UC 47NF K 50V X7R C922 067T 2152207NT GP LOW ESR 22UF 20 5...

Page 76: ...807 095T 90 23 TIN COATED J808 095T 90 23 TIN COATED J809 095T 90 23 TIN COATED J810 095T 90 23 TIN COATED J811 095T 90 23 TIN COATED J812 095T 90 23 TIN COATED J813 095T 90 23 TIN COATED 715T1811 3 P...

Page 77: ...1T0603101 CHIP 100OHM 1 16W R618 061T0603101 CHIP 100OHM 1 16W R616 061T0603101 CHIP 100OHM 1 16W R658 061T0603102 CHIP 1K OHM 1 16W R643 061T0603102 CHIP 1K OHM 1 16W R644 061T0603102 CHIP 1K OHM 1 1...

Page 78: ...UF K 16V X7R C653 065T0603105 17 CHIP 1UF 16V Y5V C648 065T0603105 17 CHIP 1UF 16V Y5V C647 065T0603105 17 CHIP 1UF 16V Y5V C613 065T0603105 17 CHIP 1UF 16V Y5V C636 065T0603221 31 CHIP 220PF 50V NPO...

Page 79: ...OHM L703 071T 56Z121 BEAD 120 OHM L613 071T 56Z121 BEAD 120 OHM L612 071T 56Z121 BEAD 120 OHM L609 071T 56Z121 BEAD 120 OHM L608 071T 56Z121 BEAD 120 OHM L607 071T 56Z121 BEAD 120 OHM L606 071T 56Z12...

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