LG RZ-20LA70 - TROUBLE SHOOTING; Common Symptoms and Solutions

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1 No sound Defective Reset IC of IC604. 1) Check volume and speaker.
- Speaker Defective MSP3410G of IC601. - Sound comes out only when being inputted into Audio
- Earphone Defective B+(8V) of IC604. L/R.
2) Check after replacing IC603.
3) Replace IC601.
4) Check and replace B+ of IC604.
2 Video color beat noise Earphone shield case being touched.
Check the mould of shield and SJ209, Replace shield case.
Soldering IC501. 1) Check signal of Video input.
2) Check signal of R.G.B output.
3) Re-soldering
1 No screen Input error of inverter connector 1) Bend the pin legs of P802B connector -> recheck them
2) Check and repair IC805 SI4925.
P1 and Pin 50 connector 1) Check and fix P1 connector
being slipped out
Cracked components and 1)Check and repair tuner board and main board
soldering at tuner board 2)Solder Q403
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.
TROUBLE SHOOTING
1. General Features
No. Symptom Cause Check Point
Check Point
2. TV and external input
No. Symptom Cause