Troubleshooting - LG RZ-23LZ20 Service Manual

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

TROUBLESHOOTING

Cause
Input error of inverter connector
P804 and P704 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 IC604.
Defective MSP3411 of IC601.
Defective B+(8V,5V) of IC603.
Earphone shield case being touched.
Soldering IC301 and IC510.
1) Bend the pin legs of P1 connector -> recheck them
2) Check and repair F804.
1) Check and fix P704 connector
2) Check and fix the components at P704 LCD module
and at main board.
3) Check Pin21.
Check and repair tuner board and main board
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 IC604.
3) Replace IC601.
4) Check and replace B+ of IC603.
Check the mould of shield and SJ209, Replace shield case.
Re-soldering
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Check Point
Check Point
Check Point