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TCL LCD20VS, Service Manual

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TCL LCD20VS Service Manual Download Page 19

20

” LCD TV

                                                                                                                       

TCL LCD20VS 

 

19 

5. Repair Flow Chart 

5.1 No Power (No LED indicator) 

 

   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check power cord 

and board interface 

NG 

Plug in power cord and interface 

Check F901, BD901 

Replace F901 or BD901

 

Check the circuit 

Check IC901 Q901 

Replace IC901 or Q901 

Check T901 

Replace T901 

Check D904, D902 

Replace D904, D902 

Replace Q903, ZD902, 

IC903 IC902 

Check Q903, ZD902, IC903 IC902 

and relative circuit 

Check Q906, IC905 and relative circuit 

No Power 

OK 

NG 

OK 

NG 

OK 

NG 

OK 

NG 

OK 

NG 

OK 

Summary of Contents for LCD20VS

Page 1: ...THIS UNIT WHEN SERVICING R FOR TH UNIT WHEN S 6 1 Main Board 25 6 2 Power Board 27 6 3 Tuner Board 30 6 4 Key Board 30 6 5 IR Board 30 6 6 Earphone Board 31 7 Block Diagram 32 8 Schematic 33 8 1 Main...

Page 2: ...ristics might create shock fire or other hazards Under no circumstances should the original design be modified or altered without written permission from TCL TCL assumes no liability express or implie...

Page 3: ...20 LCD TV TCL LCD20VS 3 Revision List Version Release Date Revision Instructions TPV Model A00 Feb 28 2007 Initial Release E206CHHLD1TSNP...

Page 4: ...nge So please return to 640 480 60Hz Audio input Mini jack for stereo headphones 3 5 TV Function TV Standard PAL B G I D K I NTSC M Sound System NICAM FM MONO Color systems PAL NTSC Video Inputs AV RC...

Page 5: ...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 5 10 15 20 25 120 minutes MUTE Temporar...

Page 6: ...tion 4 Press the MENU button to exit the menu Press the MENU button to enter the main OSD On Screen Display Adjust the items including Sound setup Picture Setup Function Setup and TV setup When the in...

Page 7: ...in the two tracks are very different in order to prevent the bad sound effect resulting from large sound variation 5 Select ON or OFF for Loudness a default setting is preset you may adjust when nece...

Page 8: ...rsonal setting 8 Reset to default It is used to reset the picture settings to the factory default mode When the input source is in TV AV S Video mode shown in the figure below 1 Brightness and Contras...

Page 9: ...et the time when TV set enter power saving mode When sleep timer only remain 1 minute It will display the counter beginning 59 it means 59 seconds and decrease after per second Now If you press any ke...

Page 10: ...store the channel program 5 Frequency Display current channel signal frequency You can fine tune frequency to your favor 6 AFC can be set to ON or OFF When it is set to ON the TV will search the TV si...

Page 11: ...Component signal input 12 Y Pb Pr left audio track input 13 Y Pb Pr right audio track input 14 TV signal input 15 AC main switch VIDEO RECORDER How to connect 1 Connect the supplied antenna cable to t...

Page 12: ...ignal cables to the Y Pb Cb Pr Cr ports of the back cover of the DVD player and the other ports to the Y Pb Cb Pr Cr ports of the component signal of theTV set 2 Connect the audio cable to the audio o...

Page 13: ...eadphone 3 Use volume key to adjust the volume 2 4 Front Panel Control Knobs SOURCE Press to select your input source VOL Press to confirm your function selection and adjustment volume Press to turn o...

Page 14: ...s AV Composite Video Video system PAL NSTC M Amplitude 1 0Vpp including sync Impedance 75 ohm terminated S Video Video system NTSC PAL SECAM Y signal amplitude 1 0Vpp including sync C signal amplitude...

Page 15: ...Description 1 Red Video 9 Mandatory 5V Supply for PC Bypass 2 Green Video 10 Sync Ground 3 Blue Video 11 Ground 4 Ground 12 Bi directional Data SDA for PC Bypass 5 Ground 13 H Sync 6 Red Video Ground...

Page 16: ...20 LCD TV TCL LCD20VS 16 4 Mechanical Instructions 1 Remove the four screws to remove the base 2 Remove the seven screws to remove the back cover 3 Remove many screws to remove the bezel...

Page 17: ...20 LCD TV TCL LCD20VS 17 4 Remove many screws to remove the shield 5 Remove the 14 screws to remove the main board power board and I O board 6 Remove the two screws to remove the headphone board...

Page 18: ...20 LCD TV TCL LCD20VS 18 7 Remove the ten screws to remove the main frame...

Page 19: ...rd and interface Check F901 BD901 Replace F901 or BD901 Check the circuit Check IC901 Q901 Replace IC901 or Q901 Check T901 Replace T901 Check D904 D902 Replace D904 D902 Replace Q903 ZD902 IC903 IC90...

Page 20: ...eset source Check LVDS cable NG Replace LVDS cable Check 12V power supply Return to 1 Check U406 Replace U406 Check panel Replace panel Check main board power supply Check I2 C communication Repair I2...

Page 21: ...tart LED indicator yellow NG Repair the keyboard Check 5V_SB Check every chip power supply Check I2 C communication Check keyboard Replace I2 C communication component Check oscillistor Replace oscill...

Page 22: ...rcuit Replace the filter or inductance Repair each relative circuit Check TU100 Replace TU100 AV S video signal component PC signal Check LVDS cable Replace LVDS cable Replace panel Abnormal display N...

Page 23: ...he filter or inductance Check TU100 Replace TU100 AV component S video PC signal Check Amplifier U601TDA7266D Replace U601 Check Earphone jack Replace the Earphone jack Check speakers Replace speakers...

Page 24: ...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 Y Is Key Pad Board Normally Replace Key Pad Board...

Page 25: ...20 LCD TV TCL LCD20VS 25 6 PCB Layout 6 1 Main Board...

Page 26: ...20 LCD TV TCL LCD20VS 26...

Page 27: ...20 LCD TV TCL LCD20VS 27 6 2 Power Board...

Page 28: ...20 LCD TV TCL LCD20VS 28...

Page 29: ...20 LCD TV TCL LCD20VS 29...

Page 30: ...20 LCD TV TCL LCD20VS 30 6 3 Tuner Board 6 4 Key Board 6 5 IR Board...

Page 31: ...20 LCD TV TCL LCD20VS 31 6 6 Earphone Board...

Page 32: ...U402 PI5V 330Q U404 RGB Gain Input PC Audio AV Audio HD Audio Switch 4052 Video H V Output PC H V Input Select H V Input TTL output LVDS output PANEL DC 12V DC 5V Inverter DDC EEPROM DDC SCL SDA EEPRO...

Page 33: ...505 75 C406 10uF Q403 PMBS3904 C485 270pF C405 10uF S1A 2 S2A 3 S1B 5 S2B 6 S1C 11 S2C 10 S2D 13 N 1 S1D 14 GND 8 DD 12 DC 9 DB 7 DA 4 VCC 16 O 15 U402 PI5V330W R487 10K Q404 PMBS3904 R494 130 R506 75...

Page 34: ...itle Size Document Number Rev Date Sheet of T1802 2 X X 2 070111 B CONNECTOR AOC Top Victory Electronics Co Ltd A3 3 14 Friday January 12 2007 Y 1 2 3 4 5 6 7 8 CN114 CONN D_DECT1 9 STATAV1 D_DECT3 9...

Page 35: ...7K 1 10W 5V 5V R541 4 7K 1 10W R534 1K 1 10W ISP_SDA 5 ISP_SCL 5 D409 LL4148 SDA 3 9 11 SCL 3 9 11 R560 2K 1 10W D410 LL4148 ON_OFF 9 13 Title Size Document Number Rev Date Sheet of T1802 2 X X 2 0701...

Page 36: ...11 S2C 10 S1D 14 S2D 13 DA 4 DB 7 DC 9 DD 12 U404 PI5V330Q 1Y0 12 2Y0 1 1Y1 14 2Y1 5 1Y2 15 2Y2 2 1Y3 11 2Y3 4 S0 10 S1 9 VEE 7 GND 8 E 6 1Z 13 2Z 3 VCC 16 U302 74HC4052D 1 2 ZD405 UDZS5 6B R516 0 1...

Page 37: ...1 10W C289 0 22uF 1 2 FB205 600 OHM C225 10uF VSSP2 T23 VSSC4 R23 VDDC4 R24 VDDA3 P23 VREF_POS_LSL P24 VREF_NEG_LSR HPR P25 VREF_POS_LSR HPR N23 VREF_NEG_HPL HPR N25 VREF_POS_HPR N24 XTALIN N26 XTALO...

Page 38: ...2 Y2 B19 AUDIOIN3L D19 AUDIOIN3R C19 CVBS3 Y3 D18 C2 C3 C18 AUDOUTLSL C17 AUDOUTLSR D17 AUDIOIN4L A23 AUDOUTHPL D16 AUDOUTHPR C16 CVBSO PIP B18 DVBO FMRO C23 U401D LOCI R266 15K C306 0 47uF C305 0 47u...

Page 39: ...B216 300 OHM C282 0 1uF change from 5V_SW to 5V_SW1 Mar 22 06 C280 0 1uF 1 2 FB210 300 OHM C219 100uF 1 2 FB215 300 OHM 1 2 FB217 300 OHM SVM B17 FBISO CSY B16 HOUT A16 VSSCOMB C15 VDD_COMB D15 VIN B1...

Page 40: ...follow EEPROM VCC DIG1 TXD 5 INT0 P0 5 AA25 P1 0 INT1 AA24 P1 1 T0 AA23 VDDC2 AC17 VSSC2 AD17 P0 4 I2SWS AE18 P0 3 I2SCLK AD18 P0 2 I2SD02 AC18 P0 1 I2SD01 AF18 P0 0 I2SDI1 0 AF19 P1 3 T1 AE19 P1 7 S...

Page 41: ...IO3 D6 VDD_IO3 B6 VSS_CORE4 A6 VDD_CORE4 B7 NC35 D7 NC34 C7 NC33 D8 NC32 C8 NC31 A7 NC30 B8 NC29 A8 NC28 L14 NC27 M14 NC26 A9 NC25 B9 NC24 B10 NC23 L13 NC22 C10 NC21 A11 NC20 B11 NC19 C11 VSS_CORE3 K4...

Page 42: ...CFG10 AE8 A11 CFG11 AE7 VDD_XORE1 AC8 VSS_CORE1 AD8 A12 CFG12 AF7 A13 CFG13 AF8 A14 CFG14 AC9 A15 CFG15 AD9 A16 GPIO 10 AE9 VSS_CORE41 H2 NC4 AC10 VSS_IO1 AD10 VDD_IO2 AE10 NC5 AF10 VSS_CORE21 AC11 NC...

Page 43: ...3 32 RxOUT4 R4 33 RxOUT6 R5 35 RxOUT27 R6 7 RxOUT5 R7 34 RxOUT8 G1 38 RxOUT9 G2 39 RxOUT12 G3 43 RxOUT13 G4 45 RxOUT14 G5 46 RxOUT10 G6 41 RxOUT11 G7 42 RxOUT15 B0 47 RxOUT18 B1 51 RxOUT19 B2 53 RxOUT...

Page 44: ...o2 2 Vin 3 U103 AIC1084 33PE REF C153 47uF REF REF REF C135 0 1uF 12V_SW 8V 8V For TDA9178 Picture improve R561 10 3W R105 4 7K 1 10W 3 3V_IO FB102 0 nc 1 2 3 Q103 PMBS3906 REF REF Q116 PMBS3904 R106...

Page 45: ...y January 12 2007 C112 0 1uF 1 2 FB106 300 OHM C117 0 1uF 16V C115 0 1uF C114 0 1uF 16V C116 0 1uF C120 0 1uF 1 2 FB109 300 OHM C119 0 1uF 16V C101 10u 10V C124 0 1uF 16V C122 0 1uF 16V 1 2 FB113 300...

Page 46: ...4W C921 0 0047uF 250V R900 680K 1 8W R905 680K 1 4W C901 0 001uF 250V R925 1K 1 10W L904 1 4 2 3 C909 102p IC902 PC123FY24P 1 2 4 3 D901 FR107 C922 4 7uF ZD902 15V SMD C916 1000uF 25V ovp Q903 PMBS39...

Page 47: ...VDDA GNDA CT RT PWRGND LCT DIM LPWM RT1 REF PDRV_A FB CMP PDRV_C NDRV_D NDRV_B R801 2 4K CN805 1 2 C820 NC 0603 12V R832 33K 0603 CN801 1 2 C840 0 022uF X7R R837 270K 0603 C812 104 0805 C816 0 22uF R...

Page 48: ...cc G ND COMP FB R932 33K 1 16W R934 3K 1 16W Q906 AOD405L C930 0 1uF 50V C932 1uF 50V FB902 BEAD C938 1000uF 16V L905 L ovp C931 NC R931 22 1 16W R928 1K 1 16W Q905 PMBS3906 3 2 1 5V R935 2 7K R933 47...

Page 49: ...C228 330pF C205 0 68u switch J101 JACK 1 2 3 4 5 6 7 8 9 C202 330pF R220 C204 0 22u GND Pb AUDIO1IN_R AV1 L210 120 OHM AUDIO2IN_R AUDIO1IN_R AUDIO1_L R225 R206 C249 NC R223 R226 GND L206 150 OHM R216...

Page 50: ...V L219 47u C240 47uF R609 22K C235 33nF 50V C234 33nF R606 22 ZD408 5 6V GND GND R607 3 9K D406 BAV99 1 3 2 TU100 TUNER 1 2 3 9 15 12 13 14 4 5 6 7 8 10 11 AGC TU AS VST MT4 MT1 MT2 MT3 SCL SDA NC1 VS...

Page 51: ...5 27 29 31 33 35 37 36 39 38 40 41 42 43 44 AGC AV1 AU IN R GND SDA 5V SV Au IN_L YPbPr Au IN_L MOR Pb IF AV1 IN MOL SV Au IN_R YPbPr Au IN_R 12V 03 Rev Code CONNECTOR AOC Top Victory Electronics Co L...

Page 52: ...20 LCD TV TCL LCD20VS 52 9 Exploded View...

Page 53: ...TAPE 052T6020 6 PROTECT FILM 085T 689 7 SHIELD MAIN 089T 173 56 18 AUDIO CABLE 089T1738GAA D1 SIGNAL CABLE 089T176J 50514 FFC CABLE 5OP 089T412A18NIS3 POWER CORD WALL OUT FOR AUSTRA 092TB1JX1A31GF BA...

Page 54: ...CHIPR 390 OHM 5 1 10W R1 061T0603391 RST CHIPR 390 OHM 5 1 10W FB4 061T0805000 CHIP 0OHM 5 1 10W FB3 061T0805000 CHIP 0OHM 5 1 10W C2 065T0603225 17 CHIP 2 2UF 16V Y5V C1 065T0603225 17 CHIP 2 2UF 16V...

Page 55: ...Q34T1528 GM 6L 30 REAR COVER 750TVCA1A0722N PANEL TV 20 1 VA07 022 CPT AM1T1740 14120 SCREW CBPF6H1LY1P MAIN BOARD CN103 033T3278 10 10 PLUG B10E XHA JST E10B XHA CN114 033T3802 8H WAFER 8P RIGHT ANGL...

Page 56: ...7T 417 6 PMBS3906 PHILIPS SMT Q111 057T 763 1 A03401L SOT23 BY AOS Q112 057T 763 3 AO4411L SO 8 BY AOS SMT Q101 057T 763 3 AO4411L SO 8 BY AOS SMT RP401 061T 125220 8 CHIP ARRAY 220HM 1 16W 8P4R RP402...

Page 57: ...03101 CHIP 100OHM 1 16W R546 061T0603101 CHIP 100OHM 1 16W R551 061T0603101 CHIP 100OHM 1 16W R460 061T0603101 CHIP 100OHM 1 16W R459 061T0603101 CHIP 100OHM 1 16W R448 061T0603101 CHIP 100OHM 1 16W R...

Page 58: ...61T0603104 CHIP 100K OHM 1 16W R528 061T0603104 CHIP 100K OHM 1 16W R527 061T0603104 CHIP 100K OHM 1 16W R254 061T0603104 CHIP 100K OHM 1 16W R107 061T0603104 CHIP 100K OHM 1 16W R106 061T0603104 CHIP...

Page 59: ...1 16W R540 061T0603472 CHIP 4 7KOHM 1 16W R499 061T0603472 CHIP 4 7KOHM 1 16W R501 061T0603472 CHIP 4 7KOHM 1 16W R502 061T0603472 CHIP 4 7KOHM 1 16W R134 061T0603472 CHIP 4 7KOHM 1 16W R133 061T0603...

Page 60: ...V X7R C248 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C247 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C246 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C265 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C266 065T0...

Page 61: ...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 065T0603104 12 MLCC 0603 0 1UF K 16V X7R C113 065T06...

Page 62: ...P 27PF 50V NPO C450 065T0603270 31 CHIP 27PF 50V NPO C449 065T0603270 31 CHIP 27PF 50V NPO C484 065T0603271 31 CHIP 270PF 50V NPO C485 065T0603271 31 CHIP 270PF 50V NPO C487 065T0603271 31 CHIP 270PF...

Page 63: ...10UF M 16V C224 067T411F1003XT EC 105 CHIP 10UF M 16V C404 067T411F1003XT EC 105 CHIP 10UF M 16V C405 067T411F1003XT EC 105 CHIP 10UF M 16V C406 067T411F1003XT EC 105 CHIP 10UF M 16V C451 067T411F100...

Page 64: ...OHM 0805 FB218 071T 56G301 EA CHIP BEAD 300 OHM 0805 FB219 071T 56G301 EA CHIP BEAD 300 OHM 0805 FB220 071T 56G301 EA CHIP BEAD 300 OHM 0805 FB221 071T 56G301 EA CHIP BEAD 300 OHM 0805 FB404 071T 56G3...

Page 65: ...67T215S1024KV EC 105 CAP 1000UF M 25V C916 067T215S1024KV EC 105 CAP 1000UF M 25V C920 067T215S1024KV EC 105 CAP 1000UF M 25V C915 067T215S1024KV EC 105 CAP 1000UF M 25V C905 067T215S12115K 120UF 450V...

Page 66: ...K OHM 1 16W R803 061T0603103 CHIP 10KOHM 1 16W R804 061T0603103 CHIP 10KOHM 1 16W R806 061T0603103 CHIP 10KOHM 1 16W R835 061T0603105 CHIP 1MOHM 1 16W R833 061T0603124 RST CHIPR 120 KOHM 5 1 10W R814...

Page 67: ...R 9 31 KOHM 1 1 8W D904 061T1206000 RST CHIPR 0 OHM 5 1 4W JR801 061T1206000 RST CHIPR 0 OHM 5 1 4W JR802 061T1206000 RST CHIPR 0 OHM 5 1 4W JR803 061T1206000 RST CHIPR 0 OHM 5 1 4W JR807 061T1206000...

Page 68: ...27 CHIP 0 47UF 25V Y5V C811 065T0603562 32 CHIP 5600PF 50V X7R C840 065T0603562 32 CHIP 5600PF 50V X7R C829 065T0603682 32 CHIP 0 0068UF 50V X7R 0603 C823 065T0805101 32 100PF 10 50V X7R C844 065T080...

Page 69: ...1KV Z5F 10 J814 065TUP05473 2T CER UC 47NF K 50V X7R C922 067T 2152207NT GP LOW ESR 22UF 20 50V BY CHEMI FB902 071T 55 29 BEAD J903 071T 55 29 BEAD F901 084T 56 1 FUSE 2A 250V WICKMANN D816 093T 522SE...

Page 70: ...GM 3LA018 CARD READER COVER Q40T 20065414A RATING LABEL Q40T0001654 1A CARTON LABEL Q40T0001654 2B SN LABEL Q40T0001654 3A LABEL FOR CARTON Q40T0002654 1A IO LABEL Q44T2006654 3A CARTON Q52T6025 15199...

Page 71: ...16W R221 061T0603101 CHIP 100OHM 1 16W R216 061T0603101 CHIP 100OHM 1 16W R215 061T0603101 CHIP 100OHM 1 16W R659 061T0603103 CHIP 10KOHM 1 16W R657 061T0603103 CHIP 10KOHM 1 16W R605 061T0603103 CHIP...

Page 72: ...065T0603333 32 CHIP 0 033UF 50V X7R C227 065T0603334 17 CHIP 0 33UF 16V Y5V C220 065T0603334 17 CHIP 0 33UF 16V Y5V C221 065T0603334 17 CHIP 0 33UF 16V Y5V C222 065T0603334 17 CHIP 0 33UF 16V Y5V C223...

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