LG Electronics 32LS679C-ZC service manual Contents of LCD TV Standard Repair Process

Page 38

Contents of LCD TV Standard Repair Process

No.

Error symptom (High category)

Error symptom (Mid category)

Page

Remarks

 

 

 

 

 

1

 

No video/Normal audio

1

 

 

 

 

 

 

2

 

No video/No audio

2

 

 

 

 

 

 

3

A. Video error

Tuning fail, Picture broken/ Freezing

3, 4

 

 

 

 

 

4

 

Color error

5

 

 

 

 

 

 

5

 

Vertical/Horizontal bar, residual image,

6

 

 

light spot, external device color error

 

 

 

 

 

 

 

 

 

 

6

 

No power

7

 

 

B. Power error

 

 

 

7

Off when on, off while viewing, power

8

 

 

 

 

auto on/off

 

 

 

 

 

 

 

 

 

 

8

C. Audio error

No audio/Normal video

9

 

 

 

 

 

9

Wrecked audio/discontinuation/noise

10

 

 

 

 

 

 

 

 

10

D. Function error

Remote control & Local switch checking

11

 

 

 

 

 

11

External device recognition error

12

 

 

 

 

 

 

 

 

12

E. Noise

Circuit noise, mechanical noise

13

 

 

 

 

 

 

13

F. Exterior error

Exterior defect

14

 

 

 

 

 

 

First of all, Check whether there is SVC Bulletin in GCSC System for these model.

Copyright © 2012 LG Electronics. Inc. All rights reserved.

LGE Internal Use Only

Only for training and service purposes

 

Page 37 Page 39
Image 38
Page 37 Page 39
Contents READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LD21BSERVICE MANUAL http//aic.lgservice.comSERVICING PRECAUTIONS CONTENTSSAFETY PRECAUTIONS SPECIFICATIONSAFETY PRECAUTIONS IMPORTANT SAFETY NOTICESERVICING PRECAUTIONS Electrostatically Sensitive ES DevicesSmall-Signal Discrete Transistor Removal/Replacement IC Remove/ReplacementReplacement Removal1. Application range SPECIFICATION4. Model General Specification 3. Test methodDVB-S2 8PSK / QPSK 2 ~ 45Msymbol/s Symbolrate 4.0Msymbols/s to 7.2Msymbols/ssymbolrate DVB-S QPSK 2 ~ 45Msymbol/s5.2. RGB Input PC 5. Video resolutions 2D5.1. Component Input Y, CB/PB, CR/PR 5.3. HDMI InputPC/DTV PCDVI1. Application Range ADJUSTMENT INSTRUCTIONBoot file Download 2. Designation3.2. EDID Download 3.1. ADC Process3.3. EDID data 7. ADC Calibration3.4 Function Check 4. Total Assembly line process4.1. Adjustment Preparation 5. HI-POT Test 4.3. Outgoing condition Configuration6.1. Signal Table 6. Model name & Serial number D/L7.1 MAC Address 7. MAC Address & CI+ key download6.3. Method & notice GP4LOW7.2 LAN Inspection 7.3. LAN PORT INSPECTIONPING TESTח ͷͲͳͤͤͤͪͥͣ͢͡ ͙;ͤ͛ͽͥͦ͑͟͝ͳͼ͑͝;ΒΔΙΚΟΖ͚ ח ͣ͢ͶͲ SCREW ASSEMBLY WORKING GUIDEScrew specification and application situation ח ͷͲͳͤͨͩͩͣ͑͢͡͡ ͙;ͧ͛ͽ͑͢͡͝ͳͼ͑͝;ΒΔΙΚΟΖ͚Side BLOCK DIAGRAMRear LG2111 AEXPLODED VIEW to delete CI or gate for GP4LS7LR22011.12.01Copyright 2012 LG Electronics. Inc. All rights reserved for SYSTEM EEPROMNormal Normal PowerVDDC DDR3+3.3VNormal FROM LIPS & POWER B/DPowerDET +1.5VDDRIR/LED and control for normal models USB2DIODES USB SIDEUSB1DIODES HDMI SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION RGB-PC / SPDIFTHE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF ISFor Comsumer model, use 4PIN Wafer RS-232CCOMMERCIAL/NonOS MODEL OPTION COMMERCIAL MODEL OPTION LVDS for large inch IC1201 S7LR2DIVXMS10GP4LS7LR22011/06/03 DDR25612 H5TQ1G63DFR-H9CSFLASHMAINWINBOND IC1401-*1 W25Q80BVSSIG Serial Flash for SPI bootSFLASHMAINMACRONIX HEAD Headphone *Option HEADPHONEPHONE 10067972-0500LF CI RegionOption name of this page CISLOT because of Hong Kong ETHERNET H/W option ETHERNETGP4LS7LR22011/06/14 ETHERNET21 TU2601 GP4RGLOBALTUNERBLOCKTU2602TU2603 TDSS-G101D TDSN-G301D TDSQ-G001DGP4LS7LR22011/11/02 DVBS27 DVB-S2 LNB Part AllegroOptionLNB DCDCGND and AGND are connectedJK2801 SCART / COMPONENT&COMPSITFULL SCART / COMPONENT1 PSC008-01AUDIO AMPSTA380BWE Page Contents of LCD TV Standard Repair Process Error symptom Contents of LCD TV Standard Repair Process Detail Technical ManualContinue to the next page ContentMain B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable A. Video errorLCD TV A2 Check Power Board 24v outputBoard 3.5V,12V,20V voltages of PowerCheck various or 24V…Signal Quality Normal over 50% By using Digital signal level meter By using Diagnostics menu on OSDMenu→ Set up→ Support → Signal Test Signal strength Normal over 50% → Set-Top-Box, Different maker TV etc ※ Check A8/ A9Check color by input -External Input COMPONENT -RGB Link CableConnect other external device and cable External device screen error-Color errorVertical/Horizontal bar, residual image, light spot Check color condition by input -External Input -Component RGBCheck Power On ‘”High” B. Power errorCheck Power LED Measure voltage of each output of Power B/DPOWEROFFABNORMAL1 Check Power Off ModeIf Power Off mode is not displayed Check Power B/D voltage POWEROFFCPUABNORMALCheck user menu Speaker off C. Audio error24V of Power Check audio B+In case of External Input signal error Check and fix external device Check audio B+ VoltageCheck & Repair D. Function error1. Remote controlR/C operating error Recognition error Check input signalY Check technical Signal information input? - Fix information Replace Main B/DE. Noise Identify nose typeF. Exterior defect
Top Page Image Contents