Troubleshooting - LG RZ-20LA60 Service Manual

1. General Features
No. Symptom
1 No screen
2 Dark screen
2. TV and external input
No. Symptom
8 No sound
- Speaker
- Earphone
9 Video color beat noise

TROUBLESHOOTING

Cause
Input error of inverter connector
Pin 40 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
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
- 12 -
Check Point
1) Bend the pin legs of P1 connector -> recheck them
2) Check and repair the IC804 SI4963,805 SI4925
1) Check and fix P701 connector
2) Check and fix the components at P701 LCD module
and at main board.
3) Check Pin40.
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.
Check Point
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