LG 26LG30D Service Manual page 17

5. RGB PC doesn't display
Check J703 ,
Can you see the normal waveform?
Check the input of RGB Video switch(IC700) ,
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),
Can you see the normal waveform?
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
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.
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Only for training and service purposes
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
J703
may have problem. Replace this Jack.
After checking the Power of RGB Video switch, you
should decide to replace RGB Video switch or not.
After checking the Power of RGB Audio switch, you
should decide to replace RGB Audio switch or not.
After checking the Power of RGB Audio switch you
should decide to replace RGB Audio switch or not.
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
- 17 - LGE Internal Use Only