LG Electronics 37LT640H-ZA manuals
TV and Video > Flat Panel Television
When we buy new device such as LG Electronics 37LT640H-ZA we often through away most of the documentation but the warranty.
Very often issues with LG Electronics 37LT640H-ZA begin only after the warranty period ends and you may want to find how to repair it or just do some service work.
Even oftener it is hard to remember what does each function in Flat Panel Television LG Electronics 37LT640H-ZA is responsible for and what options to choose for expected result.
Fortunately you can find all manuals for Flat Panel Television on our side using links below.
LG Electronics 37LT640H-ZA Service Manual
61 pages 6.68 Mb
3 SAFETY PRECAUTIONSIMPORTANT SAFETY NOTICEGeneral GuidanceBefore returning the receiver to the customer, Leakage Current Cold Check(Antenna Cold Check) Leakage Current Hot Check (See below Figure) Leakage Current Hot Check circuit 4 SERVICING PRECAUTIONS6 SPECIFICATION10 ADJUSTMENT INSTRUCTION16 S7LRBLOCK DIAGRAMTuner IC1902 Pro:Idiom CI Slot (P1901) - Tuner Pro:Idiom CI Slot (P1901) - S001D) TU3702 51P 30P S7LRIC1902 S001D) TU3702 51P 30P 17 EXPLODED VIEW18 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS EMEA INTERACTIVEPM MODEL OPTION I2C Internal demod out EEPROM A0h 1 20FLASH/EEPROM/GPIO IC101-*2 LGE2111A-T8 LGE2112-T8 EEPROM_1M S7LR2_UO4_Divx/MS10 from BUFFER ICfor SYSTEM/HDCP EEPROM&URSA3 for SERIAL FLASH NAND FLASH MEMORY <CHIP Config> (I2S_OUT_BCK,I2S_OUT_MCK,PAD_PWM1PAD_PWM0) DIMMING HDCP EEPROM <CHIP Config1)> Boot from SPI CS1N(EXT_FLASH) 1b0 Boot from SPI_CS0N(INT_FLASH) 1b1 CI SLOT or ProIdiom $0.16 $0.44 19 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 2 20EXTERNAL SPEAKER OUT DSUB SOC_RESET CVBS In/OUT H/P OUT TUNER_I2C RSDS Power OPT Normal 2.5V MAIN2, HW OPT VDDC 1.05VNonOS:ErrorOut OS:DualStream A8 MODEL_OPT_5 MODEL_OPT_1 T24 DVB_S MODEL_OPT_6 120HZ MODEL_OPT_7 NonOS:NON_ErrorOut Normal Power 3.3V STby 3.5VSIDE USB SCART1_RGB/COMP1 AUDIO OUT DDR3 1.5V EMEA INTERACTIVEPHM_OFF F4 NON_DVB_T2 PIN NO. PIN NAME PHM_ON MODEL OPTIONAB3 HIGH MODEL_OPT_0 T25 NON_3D 3D NON_OLED LOW DVB_T2 MODEL_OPT_4 NON_DVB_S MODEL_OPT_3 OS:NON_DualStream B8 * Dual Stream is only Korea 3D spec MODEL_OPT_2 NON_120HZ FHD U23 AB2 OLED 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS +5V_ST Step Up regulator 3.3V to 5V(MAX 250mA) IC301+5V_ST SC632ULTRT 3.3V to 5V IC300 UPD78F1164GF(S) NEC_MICOMMICOM MODEL OPTION MODEL OPTION 2011.08.21 3 20 EMEA INTERACTIVE SUB MICOMCopyright 2012 LG Electronics. Inc. All rights reserved. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS AP7173-SPG-13 HF(DIODES) [To LED DRIVER] R2 Vout=0.827*(1+R1/R2)=1.225V Vout=(1+R1/R2)*0.765=5.03V Vout=0.8*(1+R1/R2)=1.5319 4A POWER_LARGETPS54327DDAR L413 IC407 IC401 Max 1000mA 21 +1.5V_DDR+3.3V_Normal +2.5V/+1.8V S7LR core 1.2V volt FROM LIPS & POWER B/D Power_DET +5V_USBR1 3A 2011.08.21 4 20 EMEA INTERACTIVE FOR LPB DownloadERROR_OUT is used for lamp(CCFL/EEFL) models. In other words, LED models need not use. Not used : only for small(ready) 22 NTP-7500LIC5012 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS EMEA INTERACTIVE AUDIO AMP 23 IR & LEDFILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 6 20 CONTROL USB_DIODES 27 RGB/SPDIF/PC/HP/USBRGB PC EARPHONE BLOCK EMEA INTERACTIVE INTERFACE 11 20 28 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS CLose to DDR3 LGE2112-T8 H5TQ1G63DFR-H9C IC1201 H5TQ1G63DFR-H9C IC1202 S7LR_DIVX_MS10Close to DDR Power Pin CLose to Saturn7M ICCLose to DDR3 DDR3 1.5V By CAP - Place these Caps near Memory Close to DDR Power Pin CLose to Saturn7M IC DDR3 1.5V By CAP - Place these Caps near Memory EMEA INTERACTIVE DDR 12 20 29 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC1300 IC1300-*1 W25Q80BVSSIG MX25L8006EM2I-12G EMEA INTERACTIVE S-FLASH 13 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS TUNER MULTI-OPTIONSI2156_DVB_1INPUT_H SI2176_ATSC_1INPUT_H TDSS-H101F 7+1.8V 8CVBS 9IF_AGC 10 DIF[P] 11 DIF[N]+1.2V/+1.8V_TU IF_AGC_MAIN IF_P_MSTAR IF_N_MSTAR TDSS-G101D TU14005+3.3V 2RESET 1NC 3SCL 6SIF 12 SHIELDTU1400-*1 TDSS-G201D TU1400-*2 30 P4R_GLOBAL_TUNER_BLOCKclose to TUNER EMEA INTERACTIVE TUNER 14 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS I2C : 0xF0 31 PI_LG1001IC1501 LGDT1001BUFFER/LINE DRIVER EMEA INTERACTIVE Pro:Idiom 15 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS [SCART AUDIO MUTE] 32 Full Scart/ Comp1COMPONENT2 EMEA INTERACTIVE REAR JACK 16 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS TPA6011A4PWPRG4MSTAR-EEPROM EXT_SPK CONTROL IC1700 400mA 33 UART/I2C SWITCHEXT_SPK_CONTROL/DEBUG EXT_SPK OUT EXT_SPK AMPUART_SW1 UART_SW2 INTERACTIVE NEC USB_DOWNLOAD UART_SW NEC DEBUG MSTAR DEBUG DEBUG_NEC/MSTAR DBG_SW NEC-EEPROM EEPROM_SW EMEA INTERACTIVE EXT SPK 17 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS EXTERNAL_POWER DETECTION 34 REAL TIME CLOCK(RTC)EXTERNAL_POWER OUT 5V/12V$0.21 EMEA INTERACTIVE EXT_POWER 19 20 Vout=(1+R1/R2)*0.765=5.03V FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS CI TS INPUT CI POWER ENABLE CONTROL CI DETECT CI SLOT CI HOST I/F 35 * Option name of this page : CI_SLOT CI Region (because of Hong Kong)CLOSE TO MSTAR EMEA INTERACTIVE PCMCI 19 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 36 SMD GASKET EMEA INTERACTIVE SMD_GAS 20 20 38 Contents of LCD TV Standard Repair Process1. Trouble Shootingdate Revis ed date 1/13 symptom A. Video error No video/ Normal audio A4A1 A2 A28 A7 & A3 39 First of all, Check whether all of cables between board is inserted properly or not.(Main B/DPower B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,) 1 41 A. Picture Problem43 Vertical/Horizontal bar, residual image, light spotVertica l / Horizontal bar, residual image, light spot, external device color error External device screen error-Color errordevice and cable date Revis ed date 5/13 B. Power errorNo power A4 A18 A17 A19 6. Stand-By: Red . Operating: whit e 44 55 Appendix : Exchange T-Con Board (1)56 Appendix : Exchange T-Con Board (2)59 Appendix : Exchange the Module (2)Un-repairable Cases In this case please exchange the module.
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