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LG Electronics 19LS3500, 19LS3500/350S/350T-ZA First of all, Check whether all of cables between board is inserted properly or not.

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Normal

audio

Move to No

video/No audio

No video

Normal audio Check Back Li ght

On with naked eye On Y

Check Power

Board

12v,3.5v etc.

Normal

voltage

Replace T-con

Board or module

Repair Power

Board or parts

Check Power Board 24v output

Normal

voltage YReplace Inverter

or module

Repair Power

Board or parts

End

Always check & record S/W Version and White

Balance value before replacing the Main Board Replace Main Board Re-enter White Balance value

※Precaution

Established

date

Standard Repair Process

Revised date 1/14

LCD TV Error

symptom A. Video error

No video/ Normal audio

☞A4☞A1

☞A2

☞A6 & A3

First of all, Check whether all of cables between board is inserted properly or not.

(Main B/D↔Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,)

2012. 01 .14

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) LS35/LS34/CS46 series models are not supported. 5.3. HDMI Input(PC/DTV) ADJUSTMENT INSTRUCTION 1. Application Range 2. Designation 3. Main PCB check process * Boot file Download 3.1. ADC Process 3.2. EDID Download 3.3. EDID data 3.4 Function Check 4. Total Assembly line process 4.1. Adjustment Preparation * Auto-control interface and directions * Manual W/B process using adjust Remote control. 4.2. EYE-Q function check 5. HI-POT Test 5.1. HI-POT auto-check preparation 5.2. HI-POT auto-check 5.3. Checkpoint 6. Model name & Serial number D/L 7. MAC Address & CI+ key download GP4_LOW 7.1 MAC Address 7.1.1 Equipment & Condition 7.1.2 Download method 7.2 LAN Inspection 7.3. LAN PORT INSPECTION(PING TEST) SET PC DISASSEMBLY Component/AV STA380BW SPK L/R ETHERNET(T2 Only) Audio AMP Re a r BLOCK DIAGRAM Si de FE_ VOUT ATV : SI2176 EXPLODED VIEW Contents of LCD TV Standard Repair Process First of all, Check whether there is SVC Bulletin in GCSC System for these model. Contents of LCD TV Standard Repair Process Detail Technical Manual Continue to the next page date Revised date 1/14 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,,,) A4 Page Page Color error A7 A8/ A9 date Revised date 5/14 symptom 2012. 01 .14 Vertical/Horizontal bar, residual image, light spot Vertical / Horizontal bar, residual image, light spot, external device color error External device screen error-Color error device and cable date Revised date 6/14 A14 date Revised date 8/14 * Please refer to the all cases which can be displayed on power off mode. A15 A16 abnormal audio/discontinuation/noise is same after Check input signal compared to No audio Wrecked audio/ discontinuation/noise A16 date Revised date 10/14 1. Remote control(R/C) operating error Page E. Noise F. Exterior defect Page Contents of LCD TV Standard Repair Process First of all, Check whether there is SVC Bulletin in GCSC System for these model. Contents of LCD TV Standard Repair Process Detail Technical Manual Continue to the next page date Revised date 1/14 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,,,) A4 Page Page Color error A7 A8/ A9 date Revised date 5/14 symptom 2012. 01 .14 Vertical/Horizontal bar, residual image, light spot Vertical / Horizontal bar, residual image, light spot, external device color error External device screen error-Color error device and cable date Revised date 6/14 A14 date Revised date 8/14 * Please refer to the all cases which can be displayed on power off mode. A15 A16 abnormal audio/discontinuation/noise is same after Check input signal compared to No audio Wrecked audio/ discontinuation/noise A16 date Revised date 10/14 1. Remote control(R/C) operating error Page E. Noise F. Exterior defect