Read LG 32LH70 (CHASSIS:LA92D) Service Manual online
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5. RGB PC doesn’t display
Check JK203,
Can you see the normal waveform?
NO
JK203
may have problem. Replace this Jack.
Check the input of RGB Audio
switch(IC405 in the Jack Board) ,
Can you see the normal waveform?
Check the output of RGB Audio
switch(IC405 in the Jack Board) ,
Can you see the normal waveform?
YES
YES
NO
After checking the Power of RGB Audio switch,
you should decide to replace RGB Audio switch
or not.
NO
After checking the Power of RGB Audio switch
you should decide to replace RGB Audio switch
or not.
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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