LG Electronics 32LN52**-ZA C. Audio error , LCD TV

9 / 36

No audio

Screen normal

Check user

menu >

Speaker off Off N

Cancel OFF

Check DC24V from

Adapter Normal

voltage

Replace Adapter

Check Speaker

disconnection

Replace Speaker

Replace Main B/D End

C. Audio error

No audio/ Normal video

☞A15 ☞A4

Disconnection

Established

date

Revised date 9/14

LCD TV Error

symptom

Standard Repair Process

2013. 01 .09

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 5. External Input Support format 5.1. HDMI Input 1 (PC/DTV) 5.2. USB Input 5.3. USB Input format 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.V-com adjustment 4.2. White Balance adjustment * Auto-control interface and directions * Manual W/B process using adjust Remote control. 4.3. Outgoing condition Configuration 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 7.1 MAC Address GP4_LOW 7.1.1 Equipment & Condition 7.1.2 Download method SCREW ASSEMBLY WORKING GUIDE DISASSEMBLY WORKING GUIDE PCMCIA (SIDE) TV Tuner LCD Panel (FHD 51P/HD 30P) LVDS (8 bit) Back Light LED Driver BLOCK DIAGRAM 1. MAIN 2. POWER S7LRM MSD804KKX 3. I2C EXPLODED VIEW FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IR/CONTROL 2012/07/18 6 IR/LED and Control USB (SIDE) FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS S_FLASH_OS 2012/06/20 13 IC1300 MX25L8006EM2I-12G Serial Flash for SPI boot(OS) FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS +3.3V_Normal +3.3V_Normal PCMCI 2013/03/25 19 CI Region (because of Hong Kong) FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 2013/02/05 AMP_STA380BWEF 34 IC3401 STA380BWF AUDIO AMP(STA380BWEF) MSTART DEBUG_4PIN RS-232C EU NOT USED TP (ERRC) FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IC1201 H5TQ2G63DFR-PBC M1_DDR (1DDR) 2012/06/21 54 FULL SCART SCART AMP [SCART AUDIO MUTE] FULL SCART COMPONENT & AV NOT USE TP(LN52) HDMI_1(ARC) HDMI(REAR 2 Without MHL) EU NOT USED TP (LN52_ERRC) HDMI_2 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS +5V_Normal L13 Adapter POWER BLOCK +24V_AMP_VCC +24V_ADAPTER -> +3.5V_ST 5A 3A FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS +24V_LED_DRIVER 400mA 285mA Adapter LED Driver SYM.C H/W opt:EU STby 3.5V Close to MSTAR CVBS In/OUT LN52_LVDS (EU) MIRROR Pol-change Change in S7LR MIRROR FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS AR101 SYM.A I2C Internal demod out NETCAST4.0_EU_TUNER_BLOCK FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS IF_N_MSTAR B1 A1 A1 Page 1 / 36 Y A6 & A3 End Established date 2 / 36 Revised date 2/14 A4 3 / 36 Picture broken/ Freezing A6 A5 Check RF Cable 4 / 36 Tuning fail, Picture broken/ Freezing Close A6 Y 5 / 36 Color A10 Color Color error 6 / 36 condition N Vertical/Horizontal bar, residual image, light spot Vertical / Horizontal bar, residual image, 2013. 01 .09 8 / 36 B. Power error symptom A13 Off when on, off while viewing, power auto on/off Mode C. Audio error symptom No audio/ Normal video A15 A4 date Revised date 9/14 C. Audio error symptom Wrecked audio/ discontinuation/noise Wrecked audio/ Request repair to external D. Function error A16 A4 from light in room. Remote control & Local switch checking D. Function error LCD TV 13 / 36 If there is a Tak Tak noise from the E. Noise Established LCD TV 14 / 36 exterior damage F. Exterior defect Established LCD TV 15 / 36 Contents of LCD TV Standard Repair Process Detail Technical Manual Continue to the next page 16 / 36 Contents of LCD TV Standard Repair Process Detail Technical Manual 28 D. Function error_ No response in Continued from previous page <ALL MODELS> 17 / 36 Power On -> disjoint back case -> check lighting at 2 points. Page 3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), re- 20 / 36 A. Video error_No video/ Audio LCD TV Check the DC 24V (L421) Page Page Page 24 / 36 1. Check and replace LVDS Cable 2. Check LVDS connection condition A. Video error_Color error <ALL MODELS> A. Video error_Color error Appendix : Exchange T-Con Board (1) Appendix : Exchange T-Con Board (2) Page Page Source TAB IC Defect Appendix : Exchange the Module (2) Un-repairable Cases In this case please exchange the module. Page 32 / 36 B. Power error _No power LCD TV Check the DC 24V (L421) Check the ST-BY 3.3V (L405) B. Power error _No power LCD TV for adjustment Page LCD TV