LG Z20LCD1 Service Manual
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LG Z20LCD1 Service Manual

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LCD TV SERVICE
MANUAL
FACTORY MODEL: 20LV1R.AUSBZA
MODEL: Z20LCD1
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
e-mail: http://www.LGEservice.com/techsup.html
- 1 -
Website:http://biz.LGservice.com

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  • Page 1 Website:http://biz.LGservice.com e-mail: http://www.LGEservice.com/techsup.html LCD TV SERVICE MANUAL FACTORY MODEL: 20LV1R.AUSBZA MODEL: Z20LCD1 CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. - 1 -...

  • Page 2: Table Of Contents

    CONTENTS CONTENTS ............................2 PRODUCT SAFETY ........................3 SPECIFICATION ..........................6 SVC REMOCON……………......................8 TROUBLE SHOOTING ........................9 BLOCK DIAGRAM.........................13 WIRING DIAGRAM .........................15 EXPLODED VIEW ....……………………………..............16 REPLACEMENT PARTS LIST ......…....……………………………....18 SVC. SHEET ..........................- 2 -...
  • Page 3 SAFETY PRECAUTIONS - 3 -...

  • Page 4: Contents

    SERVICING PRECAUTIONS - 4 -...

  • Page 5: Product Safety

    - 5 -...
  • Page 6 - 6 -...

  • Page 7: Specification

    SPECIFICATION NOTE: Specifications and others are subject to change without notice for improvement. 1. Application range 1.1 This spec sheet is applied all of the 20" LCD TV 1.2 Not included spec and each product spec in this spec sheet apply correspondingly to the following each country standard and requirement of Buyer 2.
  • Page 8 4. External Input Format 4-1. AV/S-Video/Component Video Inputs Video system NTSC AV (Composite Video) Amplitude 1.0Vpp (including sync) Impedance 75 ohm terminated Video system NTSC Y signal amplitude 1.0Vpp (including sync) S-Video C signal amplitude 0.286Vpp Impedance 75 ohm terminated HDTV 480i, 480p, 720p, 1080i Y signal amplitude...
  • Page 9 - 9 -...

  • Page 10: Svc Remocon

    SVC REMOCON Function Press to turn on/off the TV. The TV is never completely powered POWER off unless it is physically unplugged. DISPLAY Display current status MUTE Temporarily interrupt the sound or restore Press ▲ or▼ to brows through the TV channels which are not erased.

  • Page 11: Trouble Shooting

    TROUBLE SHOOTING 1. No Power (No LED indicator) No Power Check power Plug in power cord and interface cord and board Check F901, BD901 Replace F901 or BD901 Check the load Check IC901 Replace IC901 or Q901 Check T901 Replace T901 Check D904, D905 Replace D904, D905 Check Q903, ZD902, IC903 IC902 and...
  • Page 12 2. No Display (LED indicator green) No display Check the source Reset source Check LVDS cable Replace LVDS cable Return to “1” Check 12V power supply Check main board power Check U406 Replace U406 Repair I C communication relative circuit Check I C communication Replace panel...
  • Page 13 4. Abnormal Display Abnormal display Check the source Reset source Replace the filter or inductance Check signal filter circuit AV, S-video signal Check input signal RF signal Check TV system setup component PC signal Check LVDS cable Replace LVDS cable Check TU100 Repair each relative circuit Replace panel...
  • Page 14 5. No Sound No sound Reset source Check the source Replace the filter or inductance Check signal filter circuit Replace the Earphone jack Check Earphone jack SIF signal Check TV system setup Check TU100 Replace TU100 Check relative circuit AV, component, S-video, PC signal Check Amplifier TDA7266D U601 Replace U601 Replace speaker...

  • Page 15: Block Diagram

    BLOCK DIAGRAM 1. Main Board PHILIPS LOC1 TV Block Diagram PC D-sub PI5V Y/PR/PB 330W HD input PI5V Video H/V Output 330W PC H/V Input Switch Select H/V Input 4052 RGB Gain Input VIDEO 1 Power Internal DC 12V Inverter AC 100～220 Input S-VIDEO Inverter For TV...
  • Page 16 2. Power Board - 16 -...

  • Page 17: Wiring Diagram

    WIRING DIAGRAM - 17 -...

  • Page 18: Exploded View

    EXPLODED VIEW - 18 -...
  • Page 19 EXPLODED VIEW PARTS LIST LG Part No. TPV Part No. Desc. Q'TY EBU32316701 CBPFAA6KCHLTP MAIN BOARD EBU32326801 PWTVA62CG1P POWER BOARD EBR32317001 TUPFAAAP TUNER BOARD EBR32317401 HJPFAA7P HEAD PHONE JACK BOARD 20"TV EBR32317201 IRPFAACP IR BOARD EBR32317301 KEPFAA7P KEY BOARD 6410TUW008A...

  • Page 20: Replacement Parts List

    095T8014 5563 WIRE HARNESS 034T6360 GM L COVER HWGE 095T8014 8609 WIRE HARNESS 040T 20061514A ID LABEL 098TR7SW3NELGF Remote fuhua for LG 040T 58162435A LABEL 0M1T 330 4128 SCREW 044T2006 1 0M1T 330 4128 SCREW 044T2006 2 0M1T 330 4128...
  • Page 21 Location Part No. for TPV Description Location Part No. for TPV Description BEZEL-only cabinet, without IC, braket & Q45T 99626 11 PE BAG Q34T0046 YKA1L others Q52T6025 15103 MYLAR Q34T0047 YMA1A BEZEL PLATE Q85T 689 9 SHIELD MAIN Q34T1528 GM 5L Only back cover, without IR board TUPFAAAP TUNER BOARD...
  • Page 22 067T215H102 3R 1000UF 16V FOR ROBYCON 715T1822 1C KEY BOARD PCB C167 067T215H102 3R 1000UF 16V FOR ROBYCON C454 067T305V471 3 470UF +-20% 16V 715T1811 A LG POWER BOARD PCB C903 063T 10747410S capacitance INTERFACE PLUG B10E-XHA/JST C835 065T 3J1506ET...
  • Page 23 Location Part No. for TPV Description Location Part No. for TPV Description C457 065T0603100 31 CHIP 10PF 50V NPO C256 065T0603104 12 MLCC 0603 0.1UF K 16V X7R C259 065T0603101 31 CHIP 100PF 50V NPO C255 065T0603104 12 MLCC 0603 0.1UF K 16V X7R C474 065T0603101 31 CHIP 100PF 50V NPO...
  • Page 24 Location Part No. for TPV Description Location Part No. for TPV Description C122 065T0603104 12 MLCC 0603 0.1UF K 16V X7R C128 065T0603104 12 MLCC 0603 0.1UF K 16V X7R C121 065T0603104 12 MLCC 0603 0.1UF K 16V X7R C127 065T0603104 12 MLCC 0603 0.1UF K 16V X7R C120...
  • Page 25 Location Part No. for TPV Description Location Part No. for TPV Description C490 065T0603270 31 CHIP 27PF 50V NPO C203 065T0603470 31 CHIP 47PF 50V NPO C489 065T0603270 31 CHIP 27PF 50V NPO C202 065T0603470 31 CHIP 47PF 50V NPO C447 065T0603270 31 CHIP 27PF 50V NPO...
  • Page 26 Location Part No. for TPV Description Location Part No. for TPV Description C402 067T311F100 3T 10UF +-20% 16V SMD C839 065T0603104 32 CHIP 0.1UF 50V X7R C404 067T311F100 3T 10UF +-20% 16V SMD C826 065T0603104 32 CHIP 0.1UF 50V X7R C403 067T311F100 3T 10UF +-20% 16V SMD...
  • Page 27 Location Part No. for TPV Description Location Part No. for TPV Description C939 065T0805104 32 CHIP 0.1U 50V X7R C217 065T0603331 31 CHIP 330PF 50V NPO C912 065T0805105 22 CHIP 1UF 25V X7R 0805 C207 065T0603331 31 CHIP 330PF 50V NPO C909 065T0805201 32 CHIP 200PF 50V MPO 0805...
  • Page 28 Location Part No. for TPV Description Location Part No. for TPV Description D810 093T 6433P BAV99 DIODEs D803 093T 6433P BAV99 D901 093T 6026T52T FR107 ZD903 093T 39S 10 T RLZ6.8B LLDS 056T 627503 IC GP18B38BCE-HB GUANGPU ZD902 093T 39S 15 T RLZ15B LED1 081T 12 6 GP...
  • Page 29 U203 056T 665506 HD IC AF45A3D HAODA L903 073T 253 91 L CHOKE BY LI TA U406 056T1133518SST IC SST39VF020-70-4C-NHE L905 073T 253151 T CHOKE COIL X201 093T 2258B J 24.576MHZ/20PF/49US L218 073T 5547010T PEAKING COIL 47UH+-10% TDK VAR901 061T 46 6 VARISTOR 10A 470V NCC L219 073T 5547010T...
  • Page 30 Location Part No. for TPV Description Location Part No. for TPV Description Q406 057T 417 4 CHIP PMBS3904 BY PHILIPS 057T 417 6 PMBS3906/PHILIPS-SMT Q405 057T 417 4 CHIP PMBS3904 BY PHILIPS RESISTANCE Q404 057T 417 4 CHIP PMBS3904 BY PHILIPS R561 061T153M109 59 MOFR 1 OHM +-5% 3W...
  • Page 31 Location Part No. for TPV Description Location Part No. for TPV Description R203 061V0603000 CHIPR 0OHM +-5% 1/10W R546 061V0603101 CHIPR 100 OHM+-5% 1/10W R204 061V0603000 CHIPR 0OHM +-5% 1/10W R545 061V0603101 CHIPR 100 OHM+-5% 1/10W R205 061V0603000 CHIPR 0OHM +-5% 1/10W R526 061V0603101 CHIPR 100 OHM+-5% 1/10W...
  • Page 32 Location Part No. for TPV Description Location Part No. for TPV Description R534 061V0603102 CHIPR 1K OHM+-5% 1/10W R257 061V0603103 CHIPR 10K OHM+-5% 1/10W R270 061V0603102 CHIPR 1K OHM+-5% 1/10W R258 061V0603103 CHIPR 10K OHM+-5% 1/10W R116 061V0603102 CHIPR 1K OHM+-5% 1/10W R259 061V0603103 CHIPR 10K OHM+-5% 1/10W...
  • Page 33 R540 061V0603472 RST CHIPR 4.7KOHM +-5% 1/10W Location Part No. for TPV Description R413 061V0603472 RST CHIPR 4.7KOHM +-5% 1/10W R273 061V0603220 CHIPR 22 OHM+-5% 1/10W R281 061V0603472 RST CHIPR 4.7KOHM +-5% 1/10W R123 061V0603223 CHIP 22KOHM 1/16W R105 061V0603472 RST CHIPR 4.7KOHM +-5% 1/10W R552 061V0603223...
  • Page 34 R905 061T1206514 RST CHIPR 510KOHM +-5% 1/4W R826 061V0603393 CHIP 39K OHM 1/16W CHIPR 390KOHM +-5% R904 061T1206514 RST CHIPR 510KOHM +-5% 1/4W R839 061V0603394 1/10W JR901 061T1206514 RST CHIPR 510KOHM +-5% 1/4W R933 061V0603473 CHIP 47K OHM 1/16W R907 061T1206514 RST CHIPR 510KOHM +-5% 1/4W R834...
  • Page 35 R926 061V0805931 1F CHIP 9.31K OHM 1/8W 1% R858 061V1206754 CHIP 750KOHM 5% 1/4W JR804 061V1206000 CHIP 0 OHM 1/8W R859 061V1206754 CHIP 750KOHM 5% 1/4W JR805 061V1206000 CHIP 0 OHM 1/8W R860 061V1206754 CHIP 750KOHM 5% 1/4W JR807 061V1206000 CHIP 0 OHM 1/8W R816 061V1206754...
  • Page 36 R606 061V0603220 CHIPR 22 OHM+-5% 1/10W FB416 061V0805000 CHIP 0OHM 1/10W R609 061V0603223 CHIP 22KOHM 1/16W FB414 061V0805000 CHIP 0OHM 1/10W R608 061V0603333 CHIP 33K OHM 1/10W FB413 061V0805000 CHIP 0OHM 1/10W R607 061V0603392 CHIP 3.9K OHM 1/16W FB412 061V0805000 CHIP 0OHM 1/10W R610 061V0603470...
  • Page 37 FB108 071T 56G301 EA CHIP BEAD 300 OHM 0805 J901 095T 90 23 TIN COATED FB109 071T 56G301 EA CHIP BEAD 300 OHM 0805 J828 095T 90 23 TIN COATED FB110 071T 56G301 EA CHIP BEAD 300 OHM 0805 J826 095T 90 23 TIN COATED FB111...
  • Page 38 J814 095T 90 23 TIN COATED J813 095T 90 23 TIN COATED J812 095T 90 23 TIN COATED J811 095T 90 23 TIN COATED J810 095T 90 23 TIN COATED J809 095T 90 23 TIN COATED - 38 -...
  • Page 39 MAIN BOARD PARTS +5V_SW R499 C472 FB412 100P B0805/0 C403 4.7k Q403 BC847B ROUT R487 10uF/16V R490 130 OHM C487 R504 270P R509 R498 C401 4.7k Q406 BC847B GOUT R484 10uF/16V R494 130 OHM C485 R506 270P R510 R511 R497 C406 4.7k Q404...
  • Page 40 +12V +5V_SW CN107 SCOR1 SCOL1 HDIR SCIR1 HDIL SCIL1 SCIL2 ASTB D_DECT1 MUTE STATAV1&D_DECT3 SVIDEO_CTR_1 SVIDEO_CTR_2 +12V_SW Y 1SCART D_DECT SCIR2 CVBSO2 Y 2IN CN101 C2IN PR_CR S_CTL PB_CB MUTE HD_Y ASTB FBLIN 6PIN/2.0mm AGND PC AUDIO PCIL R134 +5V_SW R132 J102 CN114...
  • Page 41 U407 74HC4052D VSDA ON_OFF R540 4.7k R560 VSCL R541 4.7k R522 R552 R551 Q415 PMBS3904 D410 1N4148 C491 FB416 100P B0805/0 D409 1N4148 ISP_SCL R534 IIC_SEL ISP_SDA Q418 R535 PMBS3904 A O C ( Top V i ct or y) E l ect r oni cs C o. , Lt d. Title IIC SWITCH Size...
  • Page 42 VGA-V +5V_SW ADC_VAA +5V_SW D401 BAV70 R547 2.7k R548 C470 D403 2.7k 100n U301 BAV99 C475 FB414 U404 100P B0805/0 R526 R483 R525 FB408 B0805/0 C476 M24C02WMN6 R512 ZD402 ZD401 5.6V RAIN 5.6V GAIN ISP_SDA BAIN ISP_SCL VGA_TV_SW ADC_VAA AVI_DET PI5V330W VGA-V TV_B...
  • Page 43 +5V_SW R223 R213 1.2K U202 K3953M VIFIN2 L203 R256 D201 BA792 VIFIN1 560nH U203 K9650M R294 R285 Q202 BC847B C225 R212 Q201 C253 SAW_SW BC847B 0.1uF C254 SIFIN2 1.2K 0.1uF R211 R201 SIFIN1 1.2K TUNGND TUNGND C255 C248 C250 C290 C289 0.1uF 0.1uF...
  • Page 44 SOR1 R292 SOL1 R293 C258 GND2 C201 C202 C205 C207 C208 C317 47pF R260 R261 GND4 47pF 47pF 47pF 47pF 47pF 47pF C232 C233 C234 C203 C204 C206 C210 2.2uF 2.2uF 4.7u 47pF 47pF 47pF 47pF U401D R288 REFO|REFIN CVBSO|PIP CVBSO2 R203 SCIL1...
  • Page 45 +1.8V_2 +3.3Vstb +5V_SW C220 C283 C265 C219 C273 100u 0.1uF 0.1uF 100u 0.1uF DIG4 DIG3 R275 R262 C279 GND5 R286 C221 0.1UF 100u U401E FB214 VDDadc R220 SANDC FBISO|CSY VSSadc FB210 Hout HOUT VDDA2 FB216 GND5 VSSCOMB VDDA FB213 VDD_COMB GNDA C271 0.1UF DIG5...
  • Page 46 +3.3Vstb +1.8V_1 +3.3Vstb C286 0.1uF R268 R295 FB219 DIG1 C298 0.22uF U401F VDDA1 C288 0.1uF R240 AA25 AE25 R239 100 nc REMOTE INT0|P0.5 P1.5|TX VDDA1 R249 AA24 S_CTL P1.0|INT1 AE24 R242 100 nc +1.8V_1 +3.3Vstb P1.4|RX R252 AA23 Ext_Hsy nc_sel P1.1|T0 AF24 P1.2|INT2...
  • Page 47 +3.3V_IO C463 SCALER_R R406 +3.3V_AVI VDDA_PPLL RAIN +1.8V_ADC +1.8V_CORE +1.8V_XTL C458 +3.3V_IO R413 R415 R416 R418 +3.3V_IO U401A R414 10pf C467 4k7 NC FER_R BL_EN VSS_CORE3 NC43 VDD_IO0 BL_ADJ VDDA_PPLL R412 VDD_IO01 VSSA_PPLL KBD0 INT_N/GPIO(7) 6745_RST KBD1 RST_N 6745_RST PWM0 GPIO()09/ACLK NC45 NC42...
  • Page 48 CN104 R458 +1.8V_CORE U401B +3.3V_LVDS IIC_SCL C437 VSS_LVDS3 100n IIC_SDA RXD/GPIO(5) RSN7 RSN7 RSN8 NC57 RSN8 STOCKO 4P RSN9 VDD_CORE1 RSN9 R457 NC14 IAPMUTE VSS_LVDS21 D(7) VSS_LVDS11 D(6) D[0..7] VDD_LVDS3 D(5) RSPS RSP8 D(4) NC59 D(3) NC58 D(2) NC56 VSS_IO0 NC50 NC54 VDD_LVDS2...
  • Page 49 CN113 RSN0 RSP0 RSN1 RSP1 RSN2 RSP2 RSN3 RSP3 RSN4 RSP4 RSN5 RSP5 RSN5 RSP5 RSN6 RSP6 RSN6 RSP6 RSN7 RSP7 RSN7 RSP7 RSN8 RSP8 RSN8 RSP8 RSN9 RSP9 RSN9 RSP9 PANEL_VDD 12*2PIN/2.0mm C454 C445 100n 10uF/16V R429 +3.3Vs_SW PANEL_VDD C426 47u CN106 FB406...
  • Page 50 +3.3Vstb +5V_SW +5V_SW +3.3Vs_SW +3.3Vs_SW U102 +3.3Vstb LM1117MP-3.3 R115 R116 CASE R128 R129 C141 R110 R120 R117 VOUT 0.22uF C147 C151 C142 220p DIG1 CN103 Q102 R121 22k BC557B Q116 R124 22k PMBS3904 R106 100k BL_ADJ +1.8VS_SW Q104 +1.8V_2 +5V_SW BC8478 U101 LM1117MP-1.8...
  • Page 51 +1.8V_PPLL +1.8VS_SW +1.8V_PPLL +1.8VS_SW +1.8V_XTL C124 100n FB105 FB113 150 OHM BLM21A102S C132 FB114 C123 +1.8VS_SW BLM21A102S +1.8V_ADC 100n 100n FB108 C119 C114 C105 100n 100n BLM21A102S C120 C113 C108 22u/6v 3 100n 100n 100n FB112 VDDA_PPLL BLM21A102S +3.3V_PLL C101 10u/10V C122 100n...
  • Page 52 POWER BOARD PARTS R919 47£[ 1/4W R920 C913 47£[ 1/4W 0.001uF MOSPEC20100 L903 D910 1000UF/25V 73L-253-91L 1000uF / 25V C914 BD901 C915 T901 GBU4J R906 R904 R903 680K£[ 1/4W 680K£[ 1/4W 100K£[ 2W C906 C917 C905 1500pF/1KV 120UF/450V C920 0.1uF/50V C916 1000uF/25V 1000uF/25V...
  • Page 53 CN801 C801 47PF/3KV D801 SB240 C802 47PF/3KV 470uF/25V C803 AM4502 +12V CN802 C806 C804 47PF/3KV Q801 4.7uF/1206 X5R R801 2.4K£[ R802 ZD801 C805 470£[ 1206 5.6V 104/0805 Q802 R804 ZD802 C808 DTA144WKA 10K£[ 0603 R803 5.6V C807 15pF/3KV 10K£[ 0603 4.7uF/1206 X5R CN803 R862...
  • Page 54 Q906 AOD405L FB902 L905 R928 1K£[ 1/16W Q904 R930 3.6K£[ 1/16W PMBS3904 BEAD R929 R931 C940 C942 330 1/4W 22£[ 1/16W 470uF/16V 470uF/16V 1000uF/16V C941 Q905 C938 D912 0.1uF/50V SR24 PMBS3906 ZD903 IC905 6.2V/SMD 2.7K£[ R935 C931 C939 0.1uF/50V C932 R934 D913 COMP...
  • Page 55 P/NO: Jul, 2006 Printed in China - 55 -...

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