LG 42SL90QD Service Manual Download Page 62

Page: 62 / 65

Making

Revision

2009. 2 . 1

22/25

LCD TV

Symptom

SPDIF No Audio Problem

A di OK

Check the Trouble Shooting Guide

Revision

Check the SPDIF Cable

Speaker Audio OK

YES

Related to Audio Problem

YES

Check MAIN B’D JK403

Replace MAIN B’D JK403

YES

Check MAIN B’D R2305

PWM Signal ?

YES

Replace MAIN B’D IC 100

Only for training and service purposes

LGE Internal Use Only

Summary of Contents for 42SL90QD

Page 1: ... READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LB91L MODEL 42SL90QD 42SL90QD AA North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only Printed in Korea P NO MFL60020331 0909 REV00 ...

Page 2: ...Electronics Inc All right reserved Only for training and service purposes 2 LGE Internal Use Only CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 BLOCK DIAGRAM 13 EXPLODED VIEW 14 SVC SHEET ...

Page 3: ... operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna terminals...

Page 4: ... on your body by touching a known earth ground 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 unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge...

Page 5: ...the solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replac...

Page 6: ...Colors 10bit 12 Coating 3H 1 Application Range This specification sheet is applied to the LCD TV used LB91L chassis 2 Specification Each part is tested as below without special appointment 1 Temperature 25 5 C 77 9ºF CST 40 5ºC 2 Relative Humidity 65 10 3 Power Voltage Standard input voltage 100 240V 50 60Hz Standard Voltage of each products is marked by models 4 Specification and performance of e...

Page 7: ...on 1 3 DTV format Support HDCP 7 HDMI Input 4EA HDMI2 DTV DTV format Support HDCP HDMI3 DTV DTV format Support HDCP HDMI4 DTV DTV format Support HDCP 8 Audio Input 4EA RGB DVI Audio RGB DVI Audio Stereo Phone Jack Component 1 2 AV Others RCA Jack 9 SDPIF out 1EA Optical Audio out 10 USB 1EA USB2 0 JPEG MP3 DivX and SVC download No Specification Remark Resolution H freq kHz V freq Hz 1 720x480 15 7...

Page 8: ...emark DTV 1 720 480 31 469 31 5 59 94 60 27 00 27 03 SDTV 480P 2 720 576 31 25 50 54 SDTV 576P 3 1280 720 37 500 50 74 25 HDTV 720P 4 1280 720 44 96 45 5 9 94 60 74 17 74 25 HDTV 720P 5 1920 1080 33 72 33 75 59 94 60 74 17 74 25 HDTV 1080I 6 1920 1080 28 125 50 00 74 25 HDTV 1080I 7 1920 1080 26 97 27 23 97 24 74 17 74 25 HDTV 1080P 8 1920 1080 33 716 33 75 29 976 30 00 74 25 HDTV 1080P 9 1920 108...

Page 9: ...cute ISP program Mstar ISP Utility and then click Config tab 2 Set as below and then click Auto Detect and check OK message If Error is displayed Check connection between computer jig and set 3 Click Read tab and then load download file XXXX bin by clicking Read 4 Click Connect tab If Can t is displayed Check connection between computer jig and set 5 Click Auto tab and set as below 6 Click Run 7 A...

Page 10: ...ernal ADC mode by pushing G key at 5 ADC Calibration Caution Using power on button of the Adjustment R C power on TV ADC Calibration Protocol RS232 Adjust Sequence aa 00 00 Enter Adjust Mode xb 00 40 Component1 Input 480i ad 00 10 Adjust 480i Comp1 xb 00 60 RGB Input 1024 768 ad 00 10 Adjust 1024 768 RGB aa 00 90 End Adjust mode Required equipment Adjustment R C 3 4 Function Check Check Input and ...

Page 11: ...it is not same then correct it same with BOM and unplug AC cable For correct it to the model s module from factory JIG model Push the IN STOP KEY after completing the function inspection 4 2 DDC EDID Write RGB 128Byte Connect D sub Signal Cable to D Sub Jack Write EDID DATA to EEPROM 24C02 by using DDC2B protocol Check whether written EDID data is correct or not For SVC main Ass y EDID have to be ...

Page 12: ...D 40 58 2C 40 45 00 7E 8A 42 00 00 1E 01 1D 00 72 51 D0 1E 20 50 6E 28 55 00 7E 8A 42 00 00 1E 00 00 00 FD 00 3A 60 3E 1E 53 10 00 0A 20 20 20 20 20 20 70 00 a d b c c 0 1 2 3 4 5 6 7 8 9 A B C D E F 00 00 FF FF FF FF FF FF 00 1E 6D 01 01 01 10 01 03 80 73 41 78 0A CF 74 A3 57 4C B0 23 20 09 48 4C A1 08 00 81 80 61 40 45 40 31 40 01 01 30 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C 40 45 00 7E...

Page 13: ... R OUT B T DM DP PCM PCMSYNC MCLK Jack Board Digital Audio O ptic Audio L R SPDIF TEA6420 Audio Switch LBMS 2C66B4 B T Module B T DM DP CM321 2 Senso r SCL SDA_3 3V DDR2 1Gbit NAND Flash 512Mbit RS 232C Ct rl SVC DDR_Data 0 15 DQS DM Ö MAX3232 RS232 IC Data 0 Ö 7 Addr 0Ö1 CS Ö RX TX RX TX USB D P DM Serial Flash 32Mbit SPI DDR2 Qimonda Hynix Addr ctrl data USB2 0 MIC2019 O C Protector 5V 5V HDMI 1...

Page 14: ...arts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE 300 500 501 510 310 580 120 122 200 801 LV1 LV2 540 530 803 802 550 ...

Page 15: ...2 OPT POWER_DET 001 V19 001 AL11 12V R115 2 2K 12V_DIP_DET 5V_GENERAL R112 1K 12V_DIP_DET Q1001 2SC3052 12V_DIP_DET E B C R139 OPT PWM1 PWM2 PWM2 R175 100 R177 0 HDMI_EQ_SEL R178 100 C110 1uF OPT BIT_SEL 009 AH21 R182 100 R155 100 NTP_MUTE 007 W13 R117 2 2K R116 2 2K MODEL_OPT_1 001 Q19 MODEL_OPT_3 001 Q20 IC104 MAX810RTR 1 GND 3 VCC 2 RESET IC101 NCP803SN293 1 GND 3 VCC 2 RESET FE_TUNER_SCL FE_TU...

Page 16: ...69A Saturn6 Non RM IC100 RXACKP F1 RXACKN F2 RXA0P G2 RXA0N G3 RXA1P H3 RXA1N G1 RXA2P H1 RXA2N H2 DDCD_A_DA A1 DDCD_A_CK B2 HOTPLUG_A A2 RXBCKP C3 RXBCKN B1 RXB0P C1 RXB0N C2 RXB1P D2 RXB1N D3 RXB2P E3 RXB2N D1 DDCD_B_DA E1 DDCD_B_CK F3 HOTPLUG_B E2 RXCCKP AE8 RXCCKN AD8 RXC0P AD9 RXC0N AF8 RXC1P AF9 RXC1N AE9 RXC2P AE10 RXC2N AD10 DDCD_C_DA AE7 DDCD_C_CK AF7 HOTPLUG_C AD7 CEC J3 HSYNC0 SC1_ID N2...

Page 17: ...05 56 AR313 56 1 8V_DDR R307 22 R301 1K 1 R312 56 R315 56 AR310 56 AR301 56 R347 4 7K OPT R325 56 R338 56 1 8V_DDR 1 8V_DDR R329 56 OPT IC301 1 HYB18TC512160B2F 2 5 Qimonda_512M_DDR J2 VREF J8 CK H2 VSSQ2 B7 UDQS N8 A4 P8 A8 L1 NC4 L2 BA0 R8 NC3 K7 RAS F8 VSSQ3 F3 LDM P3 A9 M3 A1 N3 A5 K8 CK R3 NC5 L3 BA1 J7 VSSDL L7 CAS F2 VSSQ4 B3 UDM M2 A10 AP K2 CKE R7 NC6 M7 A2 N7 A6 M8 A0 J1 VDDL K3 WE E8 LD...

Page 18: ...0 COMP2_Pb R405 0 COMP1_Pb R406 0 COMP2_Pr R407 0 COMP1_Pr R449 75 1 R448 75 1 R450 75 1 R474 22 3 3V IC403 NL17SZ00DFT2G OPT 3 GND 2 B 4 Y 1 A 5 VCC SPDIF_OUT JK403 JST1223 001 1 GND 2 VCC 3 VINPUT 4 FIX_POLE R477 1K OPT D423 3 3V R451 0 OPT C433 100pF 50V C413 0 1uF 16V C434 0 1uF 16V OPT R488 0 OPT R475 4 7K OPT 5V_GENERAL R476 0 C432 68uF 35V R436 1K R412 2 7K C409 47pF 50V 3 3V R414 0 R413 2 ...

Page 19: ... C513 0 1uF C508 0 1uF Q501 2N7002K S D G P500 12507WR 12L 1 2 3 4 5 6 7 8 9 10 11 12 13 L504 CB3216PA501E L501 BLM18PG121SN1D ZD501 5 6V CDS3C05HDMI1 KEY1 C503 0 1uF 16V L503 BG2012B080TF 5V_ST ZD502 5 6B ROHM KEY2 R509 4 7K 3 3V_ST C500 0 1uF 16V R504 100 1 C506 0 1uF LED_ON R507 4 7K R502 0 C504 1000pF 50V R508 0 R500 0 SCL_SUB AMP Q500 2N7002K S D G C501 0 1uF R503 100 1 ZD504 5 6V AMOTECH SDA...

Page 20: ... A31 6 VCC_1 7 B32 8 A32 9 GND_2 10 B33 11 A33 12 VCC_2 13 B34 14 A34 15 GND_3 16 VSADJ 17 Y4 18 Z4 19 VCC_3 20 Y3 21 Z3 22 GND_4 23 Y2 24 Z2 25 VCC_4 26 Y1 27 Z1 28 GND_5 29 SCL_SINK 30 SDA_SINK 31 HPD_SINK 32 S1 33 S2 34 EQ 35 HPD1 36 SDA1 37 SCL1 38 B11 39 A11 40 VCC_5 41 B12 42 A12 43 GND_6 44 B13 45 A13 46 VCC_6 47 B14 48 A14 49 VDD 50 HPD2 51 SDA2 52 SCL2 53 B21 54 A21 55 VCC_7 56 B22 57 A22...

Page 21: ...DD_IO 9 DGND_PLL 10 AGND_PLL 11 LFM 12 AVDD_PLL 13 DVDD_PLL 14 TEST0 15 DVSS_2 16 DVDD 17 SDATA 18 WCK 19 BCK 20 SDA 21 SCL 22 MONITOR_0 23 MONITOR_1 24 MONITOR_2 25 FAULT 26 VDR2B 27 BST2B 28 PGND2B_1 29 PGND2B_2 30 OUT2B_1 31 OUT2B_2 32 PVDD2B_1 33 PVDD2B_2 34 PVDD2A_1 35 PVDD2A_2 36 OUT2A_1 37 OUT2A_2 38 PGND2A_1 39 PGND2A_2 40 BST2A 41 VDR2A 42 NC 43 VDR1B 44 BST1B 45 PGND1B_1 46 PGND1B_2 47 O...

Page 22: ... L812 CIC21J501NE POWER_ON RL_ON 5V_USB_SIDE C890 22uF 16V 5V_TUNER C886 0 1uF 16V C872 0 1uF 16V C883 22uF 16V OPT 3216 C809 0 1uF 16V 3 3V L820 BLM18PG121SN1D 3 3V_AVDD C808 10uF 6 3V L821 BLM18PG121SN1D C830 0 1uF 16V C829 10uF 6 3V 1 8V_MEMC 1 8V_AMP 0 1uF C887 L825 BLM18SG121TN1D 1 26V_MEMC 1 26V_VDDC C882 10uF 6 3V 1 8V_DDR 0 1uF C885 1 8V_MEMC C879 10uF 6 3V L824 BLM18SG121TN1D 3 3V R800 10...

Page 23: ...C MEMC_RXOC MEMC_RESET X900 12MHz OPC_EN M_SPI_DO C921 0 1uF R934 1M C902 15pF C900 15pF R935 100 R939 100 R942 100 R945 100 R930 100 R946 100 R929 100 R938 100 R931 100 R943 100 R936 100 R928 100 R965 22 R966 22 R969 22 R974 22 OPT R982 OPT R970 OPT R980 OPT R986 OPT R984 OPT R985 OPT R981 OPT R973 OPT R971 OPT R979 0 R983 OPT R975 0 Non_Scanning R955 OPT R987 OPT R988 OPT R989 OPT R972 510 OPC_E...

Page 24: ...0 009 R4 010 U11 A_URSA_MCLKE 010 U9 A_URSA_BA1 010 AA16 C1022 0 1uF B_URSA_CASZ AR1005 22 1 8V_FRC_DDR URSA_A 0 12 URSA_DQM1 009 W4 C1019 0 1uF A_URSA_CASZ 1 8V_FRC_DDR C1031 0 1uF AR1004 56 AR1010 22 B_URSA_RASZ 010 R17 AR1002 56 URSA_DQSB1 009 X4 B_URSA_BA0 R1071 1K 1 AR1003 56 C1038 0 1uF URSA_RASZ C1011 0 1uF C1035 0 1uF 1 8V_FRC_DDR C1029 0 1uF 1 8V_FRC_DDR AR1001 56 URSA_MCLK1 009 AA4 C1015...

Page 25: ...8TRE1 EH13A 2 OUTPUT 3 INPUT 1 ADJ GND IC1103 AZ1117H 3 3 2 OUTPUT 3 INPUT 1 ADJ GND C1155 22uF 16V GND C1147 0 1uF 16V C1154 22uF 16V C1150 22uF 16V 5V_TUNER C1149 0 1uF 16V IC1102 XC5000 1 VDDA_1 2 IN1 3 GND_1 4 IN2 5 GND_2 6 EXTCHOKE 7 GND_3 8 VDDA_2 9 VDDA_3 10 VDDC_1 11 GND_4 12 VDDC_2 13 VDDC_3 14 VDDA_4 15 VAGC 16 VIF 17 VDDA_5 18 SIF 19 GND_5 20 VDDC_4 21 VDDA_6 22 GND_6 23 VDDD_1 24 TESTM...

Page 26: ......

Page 27: ...wer Board 12v 5v etc Normal voltage Y N Replace Main Board Replace T con Board or module OR R i P Ch k P B d 20V 24 t t A27 Move to No video No audio Repair Power Board or parts Check Power Board 20V or 24v output Normal voltage Y Replace Inverter or module A2 A27 g N Repair Power Board or parts End Precaution A7 A4 Always check record S W Version and White Balance value before replacing the Main ...

Page 28: ...ror symptom Normal voltage Check various voltages of Power Board 5V 12V 20V No Video No audio Check and replace MAIN B D Y A5 or 24V No audio MAIN B D Replace Power Board and repair t N End parts 2 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 29: ...other equipments have problem or not By connecting RF Cable at other equipment DVD Player Set Top Box Different maker TV etc Menu Setup Booster A7 N Check RF Cable Connection 1 Reconnection Check S W Version SVC Bulletin Y Normal Picture Y Close p Normal Picture Y N N A7 S W Upgrade Check Tuner soldering Normal Picture N Contact with signal distributor or broadcaster Cable or Air Normal Picture Y ...

Page 30: ... Replace T Con Board N Y Color error Color error A10 A11 A27 N condition N Check error color input mode HDMI DVI N End N Y External device Cable normal External Input Component error Check external device and cable Replace Main B D N Check Test pattern A12 N Request repair for external device cable Y External device Cable normal RGB HDMI DVI error Check external device and cable Replace Main B D 4...

Page 31: ...device screen error Color error External Check screen condition by input External Input Check S W Version N Check p in abnormal displaying after exchanging T Con B d Input error Connect other external device and cable Check normal operation of External Input Component RGB and HDMI DVI by connecting Jig pattern N Y Replace Main B D Screen normal Component RGB HDMI DVI Component error Check S W Vers...

Page 32: ...ltage of each output of Power B D A20 Check Repair Mechanical Power switch on Local control of TV A21 N Y Normal voltage Replace Main B D N Normal Check ST BY 5V Replace Power B D Y Normal voltage Y A18 Y Replace Power B D N Replace Power B D Close B D 09 years new model apply mechanical power switch to reduce power consumption in stand by status If mechanical power switch off If mechanical power ...

Page 33: ...er off by REMOTE CONTROL POWEROFF_OFFTIMER Power off by OFF TIMER POWEROFF_SLEEPTIMER Power off by SLEEP TIMER POWEROFF_INSTOP Power off by INSTOP KEY Please refer to the all cases which can be displayed on power off mode Normal POWEROFF_AUTOOFF Power off by AUTO OFF POWEROFF_ONTIMER Power off by ON TIMER POWEROFF_RS232C Power off by RS232C POWEROFF_RESREC Power off by Reservated Record POWEROFF_R...

Page 34: ... Speaker off Off N Y Check audio B 20V or 24V of Power Board Normal voltage Y N A24 A25 Cancel OFF and describe Replace Power Board and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End Disconnection Replace Speaker 8 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 35: ... Signal normal Y Check audio B Voltage 20V or 24V Replace Main B D N Noise only for D TV Wrecked audio Discontinuation Noise only Replace Power B D N voltage signal Replace Main B D N o se o y for Analog Wrecked audio Discontinuation Noise only When RF signal is not received Request repair to external cable ANT provider Replace Main B D End Noise only for External Input Connect and check other ext...

Page 36: ...operating Close If R C operate Explain the customer cause is interference When turn off light in room Baterry of R C Replace Power B D or Replace Main B D Power B D don t have problem IR B D Replace R C cause is interference from light in room N 2 Local Mechanical switch operating error Y Ch k R C N l Check Repair N l N Check Replace Ch k K N l N N l Replace Main B D Y Move Y N Check R C Operation...

Page 37: ...echnical information Check input signal Signal input Y External Input and Component Recognition error Replace Main B D S W Version Y g N Check and fix external device cable RGB HDMI DVI Optical Recognition error Replace Main B D Fix in accordance ith t h i l with technical information 11 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use On...

Page 38: ...formation upgrade the S W or provide the description OR If there is a Tak Tak noise from the cabinet refer to the KMS fix information and Mechanical noise is a natural phenomenon and apply the 1st level description When the customer does not agree apply the process by stage then proceed as shown in the solution manual For models without any fix information provide the description OR agree apply th...

Page 39: ...andard Repair Process Replace module Zoom part with exterior damage Module damage Cabinet damage Replace cabinet Replace remote controller Remote controller damage Stand dent Replace stand 13 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 40: ...7 12 6 Component 13 7 RGB D SUB 14 15 8 HDMI 16 17 9 All Input 18 9 Audio Problem All Input 18 10 Digital TV 19 11 Analog TV 20 12 AV Component RGB HDMI PC HDMI DTV 21 26 13 AV Audio out No Audio Headphone SPDIF 27 30 14 USB Remocon Problem USB no connect Remocon 31 33 14 USB Remocon Problem USB no connect Remocon 31 33 15 Intelligent Sensor Intelligent Sensor 34 Copyright 2009 LG Electronics Inc ...

Page 41: ...S NO YES MAIN B D L815 3 3V Replace MAIN B D IC804 NO YES MAIN B D L816 1 26V Replace MAIN B D IC805 NO MAIN B D L809 1 8V Replace MAIN B D IC807 YES NO NO Check MAIN B D X100 Clock 12MHz Replace MAIN B D IC100 YES NO Replace MAIN B D IC102 NAND FLASH YES Replace MAIN B D IC103 Serial Flash NO Replace MAIN B D IC300 IC301 DDR2 Memory NO Replace MAIN B D IC100 NO Copyright 2009 LG Electronics Inc A...

Page 42: ... P800 Pin 20 Voltage level 2V OK Replace Power Board YES NO YES NO Replace MAIN B D Q802 P800 Pin 17 18 24V NO YES MAIN B D L810 12V Replace MAIN B D Q805 NO YES Replace Main Board YES Check LVDS Cable OK YES NO Replace LVDS Cable Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 43: ...111 5V YES NO YES Replace MAIN B D IC808 MAIN B D L1112 3 3V Replace MAIN B D IC1103 YES NO YES MAIN B D L1113 1 8V Replace MAIN B D IC1105 NO YES MAIN B D X1101 Clock NO Replace MAIN B D X1101 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 44: ...11 5V YES NO YES Replace MAIN B D IC808 MAIN B D L1112 3 3V Replace MAIN B D IC1103 YES NO YES MAIN B D L1113 1 8V Replace MAIN B D IC1105 NO YES MAIN B D X1101 Clock NO Replace MAIN B D X1101 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 45: ...s it supported Check the RCA Cable YES MAIN B D JK402 Check Replace MAIN B D JK402 YES NO Check MAIN B D R420 Video Signal NO YES Check MAIN B D C217 Video Signal Replace MAIN B D C217 NO YES Replace MAIN B D IC 100 S Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 46: ...s it supported Check the RCA Cable YES MAIN B D JK402 Check Replace MAIN B D JK404 YES NO Check MAIN B D R465 Video Signal NO YES Check MAIN B D C211 Video Signal Replace MAIN B D C211 NO YES Replace MAIN B D IC 100 S Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 47: ...ent Cable YES MAIN B D JK402 Check Replace MAIN B D JK402 YES NO Check MAIN B D R421 Video Signal NO YES Check MAIN B D C200 C203 Y C201 Pb C202 Pr Video Signal Replace MAIN B D C200 or C203 or C201 or C202 NO Video Signal Replace MAIN B D IC 100 YES Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 48: ...ent Cable YES MAIN B D JK402 Check Replace MAIN B D JK402 YES NO Check MAIN B D R422 Video Signal NO YES Check MAIN B D C214 C209 Y C215 Pb C216 Pr Video Signal Replace MAIN B D C214 or C209 or C215 or C216 NO Video Signal Replace MAIN B D IC 100 YES Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 49: ...ce MAIN B D JK405 YES NO MAIN B D JK405 Pin 2 Video signal R446 has Vsync R447 h H NO NO YES Ch k MAIN B D C207 Vid R447 has Hsync Check MAIN B D C207 Video R2030 HSYNC R2031 VSYNC Replace MAIN B D C207 or R2030 or R2031 NO YES Replace MAIN B D IC 100 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 50: ...05 Check Replace MAIN B D JK405 YES NO NO MAIN B D JK405 Pin 3 BLUE Pin 2 GREEN Pin 1 RED YES Check MAIN B D C2016 RED C2017 GREEN Video signal C2017 GREEN C2018 BLUE Video Signal Replace MAIN B D C2016 or C2017 or C2018 NO YES Replace MAIN B D IC 100 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 51: ...ed YES Check the HDMI Cable YES Check the ADJUST MENU Download EDID R f t Adj t t S EDID OK YES Refer to Adjustment Spec NO Replace Replace MAIN B D IC 100 NO MAIN B D IC601 HDCP KEY Replace MAIN B D IC 100 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 52: ...k Signal format Is it supported YES Check the HDMI Cable YES Check MAIN B D IC600 MAIN B D JACK Check JK600 HDMI1 JK601 HDMI2 YES JK601 HDMI2 JK602 HDMI3 JK603 HDMI4 YES Replace MAIN B D IC 100 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 53: ...ble NO YES Replace MAIN B D IC807 NO YES MAIN B D L824 1 8V YES MAIN B D Check R701 R702 R705 Signal YES Replace MAIN B D IC100 NO Check P700 Cable NO MAIN B D L705 Pin 1 L704 Pin 2 PWM Signal YES Replace MAIN B D IC701 NO Replace MAIN B D IC 701 YES Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 54: ...2 1 14 25 LCD TV Symptom Digital TV No Audio Problem Digital TV Video OK Revision YES Replace MAIN B D IC 100 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 55: ...blem Revision Analog TV Video OK YES Check MAIN B D R2046 Signal SIF Replace MAIN B D IC100 YES MAIN B D L1101 Signal SIF Replace MAIN B D IC1102 NO NO YES Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 56: ...the RCA Cable YES YES Check MAIN B D JK402 Replace MAIN B D JK402 NO YES MAIN B D C2011 Right Sound C2012 Left Sound signal YES NO Replace MAIN B D IC 100 Check MAIN B D C229 C230 NO Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 57: ... the RCA Cable YES YES Check MAIN B D JK402 Replace MAIN B D JK402 NO YES MAIN B D C2008 Right Sound C2009 Left Sound signal YES Replace MAIN B D IC 100 Check MAIN B D C2008 C2009 NO Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 58: ...Check the Component Cable YES YES Check MAIN B D JK402 Replace MAIN B D JK402 NO YES MAIN B D C229 Right Sound C230 Left Sound signal YES NO Replace MAIN B D IC 100 Check MAIN B D C229 C230 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 59: ...eck the Component Cable YES YES Check MAIN B D JK402 Replace MAIN B D JK402 NO YES MAIN B D C2013 Right Sound C2014 Left Sound signal YES NO Replace MAIN B D IC 100 Check MAIN B D C2013 C2014 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 60: ...he PC Audio Cable YES YES YES Check MAIN B D JK401 Replace MAIN B D JK401 NO YES MAIN B D C2015 Right Sound C2016 Left Sound signal YES NO Replace MAIN B D IC 100 Check MAIN B D C2015 C2016 NO Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 61: ...em HDMI Video OK Revision YES Check the ADJUST MENU EDID OK Download EDID Refer to Adjustment Spec NO YES NO Check the HDMI Cable Replace MAIN B D IC100 YES Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 62: ... Revision Check the SPDIF Cable Speaker Audio OK YES g Related to Audio Problem NO YES Check MAIN B D JK403 Replace MAIN B D JK403 NO YES Check MAIN B D R2305 PWM Signal YES NO Replace MAIN B D IC 100 Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 63: ...l s USB cautions YES Check MAIN B D JK406 OK NO Replace MAIN B D JK406 Check MAIN B D JK406 Pin 1 5V YES Replace MAIN B D IC 100 YES NO NO Check MAIN B D R826 5V Replace MAIN B D IC808 YES NO Check MAIN B D R848 12V Replace POWER B D YES Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 64: ...Problem Check MAIN B D P5001 l Revision Check IR B D P1 Wafer Connector Check MAIN B D P5001 Wafer Connector YES NO Replace it YES Replace IR B D YES Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 65: ...oblem Check MAIN B D P5001 Revision Check IR B D P1 Wafer Connector Check MAIN B D P5001 Wafer Connector YES YES NO Replace it Replace IR B D Connector YES Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Search results

Summary of Contents for 42SL90QD

Reviews:

Related manuals for 42SL90QD

Brands by name

Popular brands

LG 42SL90QD, Service Manual

Search results

Summary of Contents for 42SL90QD

Reviews:

Related manuals for 42SL90QD

Brands by name

Popular brands