Troubleshooting - LG RT-15LA60 Service Manual

1. General Features
No. Symptom
1 No screen
2 Dark screen
2. PC Mode
No. Symptom
5 Screen noise
6 Screen position error
7 Color beat noise
3. TV and external input
No. Symptom
8 No sound
- Speaker
- Earphone
9 Video color beat noise

TROUBLESHOOTING

Cause
Input error of inverter connector
Pin 20 connector
being slipped out
Cracked components and
soldering at tuner board
1) Defective LCD lamp
2) Defective inverter
3) Input error of inverter connector
Cause
Clock or phase being
not able to be adjusted
Screen position error
horizontally or vertically
Soldering D-SUB Jack of JA202
and IC202.
Cause
Defective Reset IC of IC603
Defective MSP3421 of IC601
Defective B+(8V,5V) of IC604,605.
Earphone shield case being touched
Soldering IC301 and IC912
1) Bend the pin legs of P1 connector -> recheck them
2) Check and repair the IC804 SI4963,805 SI4925
1) Check and fix P902 connector
2) Check and fix the components at P902 LCD module
and at main board.
3) Check Pin20.
1) Check and repair tuner board and main board
2) Solder 102.
1) Replace the inverter
2) Replace the LCD lamp
2) Check the connector input.
1) Resettig is needed according to the video card of each
PC
2) Horizontal noise : adjust phase until no horizontal
noise occurres
3) Vertical noise : adjust clock in menu until no vertical
noise occurres
1) Play the Auto Configure in Menu.
2) Adjust horizontal and vertical position until the screen
displayes normally
Recheck adn repair JA202,IC202
1) Check volume and speaker
- Sound comes out only when being inputted into Audio
L/R
2) Check after replacing IC603
3) Replace IC601
4) Check and replace B+ of IC604,605.
Check the mould of shield and JA2000, Replace shield case
Re-soldering
- 14 -
Check Point
Check Point
Check Point