Read LG 42LG5000 (CHASSIS:LD84D) Service Manual online
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AV1/2/3 doesn't display
Check J600,J600,JK607,JK618
Can you see the normal
waveform?
Check the input of Video
switch(IC700).
Can you see the normal waveform?
YES
NO
J600,J601 or SIDE AV may have
problem. Replace this Jack or SIDE
AV.
NO
After checking the Power of AV switch
you should decide to replace AV 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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