Service Manuals, User Guides, Schematic Diagrams or docs for : LG TV LT-20A20 MF002ATS

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                                                Troubleshooting
1. General Features
  No.         Symptom                            Cause                                      Check Point

   1    No screen                Input error of inverter connector      1) Bend the pin legs of P802B connector -> recheck
                                                                           them
                                                                        2) Check and repair the IC806,807 SI4925,IC801
                                                                           SI786,IC803 SI4808.
                                 P502 and Pin 21 connector              1) Check and fix P503B connector
                                 being slipped out                      2) Check and fix the components at P502 LCD module
                                                                           and at main board.
                                                                        3) Check Pin50.
                                 Cracked components and                 1) Check and repair tuner board and main board
                                 soldering at tuner board               2) Solder Q101.
   2    Dark screen              1) Defective LCD lamp                  1) Replace the inverter
                                 2) Defective inverter                  2) Replace the LCD lamp
                                 3) Input error of inverter connector   3) Check the connector input.
   3    Broken OSD display       Defective the font rom of IC501        Check and replace the font rom of IC508


2. TV and external input
  No.         Symptom                            Cause                                      Check Point
   4    No sound                 Defective Reset IC of IC902            1) Check volume and speaker
        - Speaker                Defective MSP3410D of IC901            - Sound comes out only when being inputted into Audio
        - Earphone               Defective B+(8V,5V) of IC903,904.        L/R
                                                                        2) Check after replacing IC902
                                                                        3) Replace IC901
                                                                        4) Check and replace B+ of IC903,904.
   5    Video color beat noise   Soldering IC201 and IC502,IC501        Check and resoldering.
                                 or masking it short.
   6    Video Jitter             P501B Pin20 connector defective.       Check the P501B Pin20 connector and repair.




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