LG Electronics 42LT660H-ZA C. Audio error

No audio

Screen normal

Check user

menu >

Speaker off Off N

Cancel OFF

Check audio B+

20V or 24V of

Power Board

Normal

voltage

Replace Power Board and repair parts

Check

Speaker

disconnection

Replace Speaker

Replace MAIN Board End

C. Audio error

No audio/ Normal v ideo

☞A24 ☞A25

Disconnection

Established

date

Revis ed date 8/13

LCD TV Error

symptom

Standard Repair Process

8

Only for training and service purposes

LGE Internal Use Only

Contents

Main Page SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE General Guidance Before returning the receiver to the customer, Leakage Current Cold Check(Antenna Cold Check) SERVICING PRECAUTIONS Page SPECIFICATION 1. Application range 2. Requirement for Test 3. Test method 4. Model General Specification Page 5. Video resolutions (2D) 5.1. Component Input (Y, CB/PB, CR/PR) 5.2. RGB Input (PC) 5.3. HDMI Input(PC/DTV) ADJUSTMENT INSTRUCTION 1. Application Range 2. Designation 3. Main PCB check process * Boot file Download 4. Total Assembly line process 4.1. Adjustment Preparation * Auto-control interface and directions * Manual W/B process using adjust Remote control. 4.2. DDC EDID Write (RGB 128Byte ) 4.3 DDC EDID Write (HDMI 256Byte) 4.4. EDID data 4.4.1. Auto Download 4.4.2. Manual Download 4.5. Outgoing condition Configuration 4.6. HI-POT Test 4.6.1. HI-POT auto-check preparation 4.6.2. HI-POT auto-check 4.6.3. Checkpoint 5. Model name & Serial number D/L 5.1. Signal Table 5.2. Comand Set 5.3. Method & notice * Manual Download(Model Name and Serial Number) 6. CI+ Key Download method 6.1. Download Procedure + Key Value S7LR BLOCK DIAGRAM Tuner IC1902 Pro:Idiom S7LR IC1902 S001D) TU3702 51P 30P EXPLODED VIEW FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS LGE2112-T8 EMEA INTERACTIVE PM MODEL OPTION I2C FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS LGE2112-T8 2 20 EXTERNAL SPEAKER OUT DSUB FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS +5V_ST Step Up regulator 3.3V to 5V(MAX 250mA) IC301 +5V_ST +1.5V_DDR +3.3V_Normal +2.5V/+1.8V S7LR core 1.2V volt FROM LIPS & POWER B/D NTP-7500L IC501 2 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS EMEA INTERACTIVE AUDIO AMP IR & LED FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 6 20 CONTROL EMEA INTERACTIVE IR/CONTROL FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS [51Pin LVDS Connector] (For FHD 60/120Hz) [30Pin LVDS Connector] (For HD 60Hz_Normal) 7 20 EMEA INTERACTIVE LVDS WAFER Pol-change FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS HDMI_1 8 20 HDMI_2 For CEC FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS RS232C_9PIN RS232C EMEA INTERACTIVE 10 20 RGB/SPDIF/PC/HP/USB RGB PC EARPHONE BLOCK EMEA INTERACTIVE INTERFACE 11 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS CLose to DDR3 LGE2112-T8 H5TQ1G63DFR-H9C IC1201 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC1300 IC1300-*1 W25Q80BVSSIG MX25L8006EM2I-12G P4R_GLOBAL_TUNER_BLOCK close to TUNER EMEA INTERACTIVE TUNER 14 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS PI_LG1001 IC1501 LGDT1001 BUFFER/LINE DRIVER PLL VOLTAGE_ONOLY F4/G4 Full Scart/ Comp1 COMPONENT2 EMEA INTERACTIVE REAR JACK 16 20 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS UART/I2C SWITCH EXT_SPK_CONTROL/DEBUG EXT_SPK OUT EXT_SPK AMP UART_SW1 REAL TIME CLOCK(RTC) IC1800 TPS54327DDAR EXTERNAL_POWER OUT 5V/12V $0.21 * 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 SMD GASKET EMEA INTERACTIVE SMD_GAS 20 20 Page Contents of LCD TV Standard Repair Process 1. Trouble Shooting date Revis ed date 1/13 symptom A. Video error No video/ Normal audio 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 A4 A. Picture Problem Color error date Revis ed date 4/13 Vertical/Horizontal bar, residual image, light spot Vertica l / Horizontal bar, residual image, light spot, external device color error External device screen error-Color error device and cable date Revis ed date 5/13 B. Power error Off when on, off while viewing, power auto on/off A19 A22 date Revis ed date 7/13 C. Audio error No audio/ Normal v ideo A24 A25 date Revis ed date 8/13 8 C. Audio error Wrecked audio/ discontinuation/noise date Revis ed date 9/13 A25 9 D. General Function Problem 1. Remote control(R/C) operating error A4 10 D. Function error E. Noise F. Exterior defect Page Page Page Appendix : Exchange T-Con Board (1) Appendix : Exchange T-Con Board (2) Page Page Appendix : Exchange the Module (2) Un-repairable Cases In this case please exchange the module. Page Checking method