Service Manuals, User Guides, Schematic Diagrams or docs for : LG TV LT-15A15 ML012ATR
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TROUBLESHOOTING
1. General Features
No. Symptom Cause Check Point
1 Soft touch doesn't Defective speaker wire 1) Make some space between the speaker wire and
function properly and inverter wire the Soft touch Board by sticking the speaker wire
to the guide hole of the cabinet.
2) Arrange working state of A1. correct working state of
the Shield case.
2 Soft touch doesn't 1) Broken components and 1) Check Soft touch with eyes
function soldering of them Check and repair soldering
2) P2 connector error 2) Check and repair the P2 connector
3 No screen Input error of inverter connector 1) Bend the pin legs of P1 connector -> recheck them
2) Check and repair the IC804,805 SI4925
P502 and Pin 21 connector 1) Check and fix P902 connector
being slipped out 2) Check and fix the components at P902 LCD module
and at main board.
3) Check Pin21.
Cracked components and 1) Check and repair tuner board and main board
soldering at tuner board 2) Solder Q101,102.
4 Dark screen 1) Defective LCD lamp 1) Replace the inverter
2) Defective inverter 2) Replace the LCD lamp
3) Input error of inverter connector 2) Check the connector input.
2. PC Mode
No. Symptom Cause Check Point
5 Screen noise Clock or phase being 1) Resettig is needed according to the video card of each
not able to be adjusted PC
2) Horizontal noise : adjust phase until no horizontal
noise occurres
3) Vertical noise : adjust clock in menu until no vertical
noise occurres
6 Screen position error Screen position error 1) Play the Auto Configure in Menu.
horizontally or vertically 2) Adjust horizontal and vertical position until the screen
displayes normally
7 Color beat noise Soldering D-SUB Jack of JA202 Recheck adn repair JA202,IC202
and IC202.
3. TV and external input
No. Symptom Cause Check Point
8 No sound Defective Reset IC of IC603 1) Check volume and speaker
- Speaker Defective MSP340D of IC601 - Sound comes out only when being inputted into Audio
- Earphone Defective B+(8V,5V) of IC604,605. L/R
2) Check after replacing IC603
3) Replace IC601
4) Check and replace B+ of IC604,605.
9 Video color beat noise Earphone shield case being touched Check the mould of shield and JA203, Replace shield case
Soldering IC301 and IC912 Re-soldering
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