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LG 42LH35FD Service Manual
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LG 42LH35FD Service Manual

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LCD TV

SERVICE MANUAL

CHASSIS : LJ91A
MODEL : 42LH35FD
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL61862403 (0906-REV00)
North/Latin America
Europe/Africa
Asia/Oceania
42LH35FD-SF
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
Printed in Korea

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  • Page 1: Service Manual

    Internal Use Only North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Oceania http://biz.lgservice.com LCD TV SERVICE MANUAL CHASSIS : LJ91A MODEL : 42LH35FD 42LH35FD-SF CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL61862403 (0906-REV00) Printed in Korea...

  • Page 2: Table Of Contents

    CONTENTS CONTENTS ....................2 PRODUCT SAFETY ..................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ...............10 EXPLODED VIEW .................. 17 SVC. SHEET ....................Copyright LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Product Safety

    An other abnormality exists that must be corrected before the receiver is returned to the customer. Copyright LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Servicing Precautions

    Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the Copyright LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures. Copyright LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Specification

    2) Humidity : ~ 80 % Storage Environment 1) Temp : -20 ~ 60 deg 2) Humidity : ~ 85 % Copyright LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 14. 1920*1080 33.71 29.97 74.176 HDTV 1080P 15. 1920*1080 56.25 50.000 148.5 HDTV 1080P 16. 1920*1080 28.125 25.000 74.25 HDTV 1080P Copyright LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 - Min Horiz. Freq - 30 kHz - Max Horiz. Freq - 80 kHz - Pixel Clock - 170 MHz Copyright LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 Individual or Palletizing Indi. Woo den Indi. Wooden Quantity Swivel Degree +/- 20 degree Stand Assy Swivel Force 0.8Kg f ~ 2.5Kgf Copyright LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...

  • Page 10: Adjustment Instruction

    (Display Data Channel) download • Color Temperature (White Balance) Adjustment • Make sure RS-232C control • Selection Factory output option Copyright LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 4.3. << 10P WAFER >> PIN MAP Copyright LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 - xb 00 60: Change to RGB-PC mode(No action) - ad 00 10: Adjust 1080p RGB - ad 00 90: End of the adjustment Copyright LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 • RGB 1080p adjustment in RGB input mode • If you success RGB 1080p Adjust. You can see “ADC RGB-DTV Success” Copyright LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
  • Page 14 Download jig Main RGB cable Pic.3) For write EDID data, setting Jig and another instruments. • EDID data for LJ91D Chassis (Model name = LG TV) - Analog (RGB) EDID table (0xA5, 0x25) - HDMI-1 EDID table (0x3D, 0x2C) Copyright LG Electronics.
  • Page 15 * If it needs, offset adjustment (wb 00 20-start, wb 00 2f-end) • "wb 00 ff": End of white balance adjustment (inner pattern disappear) Copyright LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 - COOL : T=11000K, △uv=0.000, x=0.276 y=0.283 - MEDIUM : T=9300K, △uv=0.000, x=0.285 y=0.293 - WARM : T=6500K, △uv=0.000, x=0.313 y=0.329 Copyright LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...

  • Page 17: Exploded View

    X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...

  • Page 18: Block Diagram

    IC500 (Comp1/2, RGB) HDMI4 SIDE HDMI_PORT4 MICOM MICOM HDMI0_BCM IC407 X-TAL IC407 TDA9996 TDA9996 HDMI2 24MHz UI_HW_PORT1 IC601 IC601 HDMI1 UI_HW_PORT2 Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 1.8V rail at 1.71V 2.5V rail at 2.375V 3.3V rail at 3.135V either 1.2V, 1.8V, 2.5V, 3.3V Min 10ms Reset Input Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 Either power-on the 2.6 V digital supplies after the 3.3 V digital supplies Or power-on the 1.2 V digital supplies simultaneously or after the 2.6 V digital supplies. Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only...
  • Page 21 RESET is negated after last power is ramped up (115 ms > minimum 10ms) 3.3V, 2.6V, 1.2V power sequence requirement of MPEG encoder is satisfied. 3.3V, 2.5V, 1.8V, 1.2V 2.5V, 1.8V, 1.2V, RESET Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 Check X201 Clock 54MHz Replace X201 Check signal transition Maybe BCM3556 has troubles at IC101 #9 pin Replace IC101 Flash Memory Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 & Recheck Check P903 Maybe BCM3556(IC100) #16(TXAC-), #17(TXAC+), has troubles #32(TXBC-), #33(TXBC+) Check LVDS Cable Replace Cable Check Voltage LCD Module Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 (5.0V, 2.5V, 3.3V, 1.2V) & Recheck Check TP Clock, Data, Sync Maybe Tuner(TU1101) has R1114, R1103, R1102 problems Maybe BCM3556(IC100) has problems Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 Maybe Tuner(TU1100) has TU1101 #9 Pin problems Check CVBS Signal Replace one of C1122/R1122 C102 & Recheck Maybe BCM3556(IC100) has problems Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 R741, R744, R745 /L702/L703/L704 & Recheck Check Component Signal C127, C128, C129 Replace it C130, C131. C132 Maybe BCM3556(IC100) has problems Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 Replace one of R759/R761/IC702 IC702 #11, #3 & Recheck Replace it or re-burn Check EEPROM (IC703) & Recheck Maybe BCM3556(IC100) has problems Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 Check AV Cable Check Jack JK700/JK704 Replace Jack Replace one of Check CVBS Signal R729/R706/C711/D703 C103 & Recheck Maybe BCM3556(IC100) has problems Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 Check IC601 Voltage Level Replace one of +1.8V_HDMI, +3.3V_HDMI L601/L602/R665/R663 Check I2C Signal R670/R671 Replace It & Recheck /R605/R606/R616/R617/R639/R64 Maybe BCM3556(IC100) has problems Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 20V, 3.3V, 1.8V Replace It & Recheck L500,L501,L502,L503,IC504 Check BCM3556 I2S Output Replace It & Recheck R148, R149, R150 Maybe BCM3556(IC100) has problems Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 Check video output video trouble shooting Follow procedure All source Maybe BCM3556 internal audio audio trouble shooting DSP has problems. Replace It Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 Replace one of R113/R128 C141 & Recheck Follow procedure All source Maybe BCM3556 audio block has audio trouble shooting problems. Replace It Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 C210, C211 C217, C218 C220, C221 Follow procedure All source Maybe BCM3556 audio block has audio trouble shooting problems. Replace It Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 Re-download EDID data Replace IC601 Follow procedure All source Maybe BCM3556 audio block has audio trouble shooting problems. Replace it Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 - USB power could be disabled by inrushing current - In this case, remove the device and try to reboot the TV (AC power off/on) Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 Check USB HDD more 40Gbyte Replace HDD Maybe IC1402 has problems Maybe BCM3556(IC100) USB Replace It. block has problems. Replace It. Copyright ⓒ 2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 +5.0V_ST COMPONENT1/2,AV1 D733 ENKMC2838-T112 R,G,B PC INPUT COMPONENT1 COMPONENT2 +5.0V IC703 D3.3V D3.3V D3.3V M24C02-RMN6T C710 22uF R707 R736 R750 2.7K 2.7K 2.7K C760 C761 COMPOSITE1_SW COMP1_SW COMP2_SW RGB_VSYNC 0.1uF C708 D722 C747 JP722 9:H5 D716 C734 D701 9:H4 ADMC5M03200L 9:H4 4700pF R711...
  • Page 38 * HDMI CEC +3.3V_HDMI +3.3V_ST +1.8V_AMP +1.8V_HDMI D3.3V L602 L601 BLM18PG121SN1D BLM18PG121SN1D Q16;AH18 JACK_GND 5V_HDMI_4 R666 C629 C623 R641 Q601 0.1uF 0.1uF AH19 SSM6N15FU HPD4 DRAIN1 SOURCE1 12:F6 +5V_POWER HDMI_CEC JP605 CEC_REMOTE R14;AG19 R658 DDC/CEC_GND R642 DDC_SDA_4 H8;H17;R26;AL11 GATE2 GATE1 JP606 R13;AG19 DDC_SCL_4...
  • Page 39 IC504 AZ1117H-1.8TRE1(EH13A) D3.3V +20.0V INPUT ADJ/GND R525 +1.8V_AMP C513 C517 C506 C518 C514 MLB-201209-0120P-N2 C505 330uF 0.1uF 0.1uF 0.1uF 10uF 0.1uF L508 OUTPUT R530 L504 C547 D501 C539 0.01uF 1N4148W DA-8580 C532 0.1uF R536 100V C533 4.7K R540 0.1uF C535 10uF C543 1000pF...
  • Page 40 * FROM LIPS & POWER B/D -->Apply changed Pin Map +3.3V_MEMC +12.0V +5.0V_ST +3.3V_ST L806 MLB-201209-0120P-N2 L832 R856 CHATTERING_BEAD MLB-201209-0120P-N2 L823-*1 R854 MLB-201209-0120P-N2 R859 D3.3V R851 Q806 L823 C877 R827 R828 CHATTERING_120 15pF C896 RT1P141C-T112 3.3K 330K C857 10uF MLB-201209-0120P-N2 +12.0V R862 RL_ON...
  • Page 41 D3.3V TUNER C1116-*1 0.1uF @netLa TU_LGIT RF_SW C1116 R1118 2200pF RF_GAIN1 +5.0V_TU RF_GAIN1 R1117 +5.0V_TU C1118 2200pF L1107 RF-GAIN_SW C1125 C1126 C1130 C1108 B0[+5V] 10uF 0.01uF 0.1uF 0.1uF +5.0V_TU 10uF TU1102 C1106 Place close to Pin VA1G5BF8005 TU_LGIT TU_LGIT L1109 RF_AGC TU_LGIT B1[+5V]...
  • Page 42 * DDR2 1.8V By CAP - Place these Caps near Memory D1.8V D1.8V A1.2V IC100 BCM3556 0.1uF C345 DDR_BVDD0 0.1uF C346 DDR_BVDD1 DDR_BVSS0 DDR_BVSS1 DDR_PLL_TEST R312 DDR0_VREF0 DDR1_VREF0 DDR_PLL_LDO R325 DDR01_CKE DDR01_CKE ELPIDA R313 ELPIDA DDR_COMP DDR01_ODT DDR01_ODT IC300 IC301 DDR_EXT_CLK EDE1116ACBG-1J-E EDE1116ACBG-1J-E...
  • Page 43 XTAL R2720 URSA_A+[0-4],URSA_A-[0-4],URSA_ACK+,URSA_ACK- URSA_B+[0-4],URSA_B-[0-4],URSA_BCK+,URSA_BCK- X2701 008:P27 M_XTALI 0 08:P27 M_XTALO +3.3V_MEMC 12MHz C2717 C2724 R2723 R2729 20pF 20pF L2706 R2724 R2730 BLM18PG121SN1D +3.3V_MEMC R2725 R2731 R2726 R2732 +1.26V_MEMC +3.3V_MEMC R2727 R2733 R2728 R2734 C2756 10uF C2754 10uF PI Result R2736 C2755 10uF R2714...
  • Page 44 DDR2 1.8V By CAP - Place these Caps near Memory +1.8V_MEMC +1.8V_FRC_DDR +1.8V_FRC_DDR +1.8V_FRC_DDR BLM18PG121SN1D L900 PI Result +1.8V_FRC_DDR +1.8V_FRC_DDR URSA_DQ[0-31] URSA_DQ[0-31] 008:U4;009:AL21 008:U4;009:D21 IC900 IC901 AR900 AR914 URSA_DQ[27] DDR_DQ[27] DDR_DQ[15] URSA_DQ[15] H5PS5162FFR-S6C H5PS5162FFR-S6C URSA_DQ[28] DDR_DQ[28] DDR_DQ[8] URSA_DQ[8] URSA_DQ[25] DDR_DQ[25] DDR_DQ[10] URSA_DQ[10] URSA_DQ[30]...
  • Page 45 D3.3V D3.3V RESET IC100 R4011 BCM3556 12:B3;12:I4 D3.3V D3.3V POWER_DET 10:G2 JTAG_RESETb EBI_ADDR3 GPIO_00 TUNER_RESETb EBI_ADDR4 GPIO_01 5:B6 SW400 EBI_ADDR2 GPIO_02 IC400 SKHMPWE010 EBI_ADDR1 GPIO_03 KIA7029AF EBI_ADDR0 GPIO_04 R408 EBI_ADDR5 GPIO_05 SYS_RESETb D3.3V EBI_ADDR6 GPIO_06 EBI_ADDR8 GPIO_07 C414 EBI_ADDR9 GPIO_08 VREG_CTRL AA27 10uF...
  • Page 46 D1.2V D1.2V C243 C249 C250 C251 C252 C253 C254 C286 C287 C244 C246 C256 C258 C259 C262 C265 C266 C288 C290 0.1uF 4.7uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 33uF 33uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 54MHz X-TAL IC100 BCM3556...
  • Page 47 IC100 BCM3556 AG28 AE18 DS_AGCI_CTL I2S_CLK_IN AH28 AF18 R149 DS_AGCT_CTL I2S_CLK_OUT BCM_I2S_SCLK_OUT 3:B4 AA21 AD17 EDSAFE_AVSS_1 I2S_DATA_IN AB22 AH19 R148 A2.5V BCM_I2S_DATA_OUT EDSAFE_AVSS_2 I2S_DATA_OUT 3:B4 AF26 AD18 EDSAFE_AVSS_3 I2S_LR_IN AF27 AG18 R150 A1.2V BCM_I2S_LRCLK_OUT EDSAFE_AVSS_4 I2S_LR_OUT 3:B4 BLM18PG121SN1D AF28 AG26 A2.5V L102 EDSAFE_AVSS_5...
  • Page 48 3.3V_VDDP_ST , MICOM IC404 +3.3V_ST +5.0V_ST D3.3V AZ1117H-3.3 INPUT ADJ/GND C415 C404 OUTPUT 0.1uF 10uF R443 C405 C417 +3.3V_ST 22uF 0.1uF R464 +3.3V_ST R463 +3.3V_ST R436 R415 R417 IC405 KIA7029AF Q400 C422 C418 0.1uF 0.1uF 2SC3052 C423 0.1uF C424 0.1uF PDP : LCD : 0.1uF...
  • Page 49 SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 2009.01.20 BRAZIL DVR DV ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR BCM3556_POWER THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
  • Page 50 P1401 CONTROL / IR / LED 12507WS-12L WAFER-STRAIGHT USB JACK JP1409 R1406 USB_POWER_OUT_2 EYEQ_SCL_3.3V Make this trace minimum 12 mil JK1403 JP1410 KJA-UB-4-0004 R1407 L1407 EYEQ_SDA_3.3V MLB-201209-0120P-N2 D1401 5.6V D1402 C1404 C1407 5.6V 1000pF 1000pF ADMC5M03200L ADMC5M03200L JP1407 BLM18PG121SN1D USB_DM2 10:C4 L1404 KEY1 C1415...
  • Page 51 DIMMING_1.8V DIMMING_RX_1.8V DIMMING_PLL_1.8V D3.3V DIMMING_3.3V DIMMING_TX_3.3V L3501 L3502 L3503 L3505 BLM18PG121SN1D BLM18PG121SN1D BLM18PG121SN1D BLM18PG121SN1D C3501 C3513 C3508 C3509 C3511 C3514 C3521 C3525 C3528 C3510 22uF 22uF 0.1uF 0.1uF 0.1uF 22uF 0.1uF 0.1uF 22uF 22uF DIMMING_3.3V URSA_A+[0-4],URSA_A-[0-4],URSA_ACK+,URSA_ACK- DIMMING_RESET R3546 URSA_B+[0-4],URSA_B-[0-4],URSA_BCK+,URSA_BCK- 4.7K IC3505 AZ7027RTRE1 R4240...
  • Page 52 URSA_B+[0-4],URSA_B-[0-4],URSA_BCK+,URSA_BCK- +12.0V_LCD AR3601 AR3619 AR3613 1/16W 1/16W 1/16W URSA_B-[4] LVDS_CH2_E_P LVDS_CH2_E_P P3601 7:D7 LVDS_TX_1_DATA4_N URSA_B+[4] LVDS_CH2_E_N LVDS_CH2_E_N TF05-51S LH50_90_ONLY 7:D7 LVDS_TX_1_DATA4_P URSA_B-[3] LVDS_CH2_D_P LVDS_CH2_D_P P3602 URSA_B+[3] LVDS_CH2_D_N 7:D7 LVDS_TX_1_DATA3_N LVDS_CH2_D_N TF05-41S 7:D7 LVDS_TX_1_DATA3_P LH50_ONLY LH35_ONLY LH35_ONLY AR3602 AR3620 AR3614 1/16W 1/16W 1/16W URSA_BCK-...

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