Read LG 42SL90QD-CA (CHASSIS:LC91L) Service Manual online
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3. CADTV doesn’t dispaly(Only CHINA)
Check the TP output data of TU1502
Can you see the normal signal?
NO
Could you measure voltage of TU1502 &
IIC lines?
Are they all normal?
NO
You should check power line
& IIC lines.
YES
You should replace Main Board.
YES
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
NO
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
This board has big problem because Main
IC(IC100) have some troubles.
After checking thoroughly all path once again,
You should decide to replace Main Board or not.
Could you measure voltage of IC1502 & IIC
lines?
Are they all normal?
NO
You should check power line
& IIC lines.
YES
4. Component1/2, AV doesn’t display
Check JK500, JK501, JK502
Can you see the normal waveform?
NO
JK500, JK501,JK502 may have problem.
Replace this Jack.
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
NO
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
This board has big problem because Main
IC(IC100) have some troubles.
After checking thoroughly all path once again,
You should decide to replace Main Board or not.
YES
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