Read LG 47LH40FD (CHASSIS:LC91A) Service Manual online
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3. Component1/2, AV1/2, S-Video doesn’t display
Check JK1402, JK1404, JK1405
Can you see the normal waveform?
NO
JK1402, JK1404, JK1405 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
4. RGB PC doesn’t display
Check JK1407 ,
Can you see the normal waveform?
NO
JK1407
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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