Read LG 19LS4D (CHASSIS:LD83A) Service Manual online
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5. RGB PC doesn’t display
Check J703 ,
Can you see the normal waveform?
Check the input of RGB Audio switch(IC1001) ,
Can you see the normal waveform?
Check the output of RGB Audio
switch(IC1001),
you see the normal waveform?
YES
YES
YES
NO
J703
may have problem. Replace this Jack.
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.
Check the input of RGB Video switch(IC700) ,
Can you see the normal waveform?
NO
After checking the Power of RGB Video switch, you
should decide to replace RGB Video switch or not.
YES
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