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AV1/2/3 doesnt display
Check J600,J600,JK607,JK618
Can you see the normal
waveform?
YES
NO
J600,J601 or SIDE AV may have problem. Replace this Jack or SIDE AV.
Check the input of Video
switch(IC700).
Can you see the normal waveform?
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
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.
NO
NO
After checking the Power of AV switch you should decide to replace AV switch or not.
After checking the Power of Main
IC(IC100) you should decide to replace
Main IC or not.
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