LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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1. TV/CATV doesn’t display
TROUBLESHOOTING
2. DTV doesn’t display
Check the output data of IC104 in the Jack
Board Pin52.
Can you see the normal sign al?
NO
Could you measure voltage of IC104 in the
Jack Bo ard & IIC lines?
Are they all normal?
NO
You should ch eck power line
& IIC lines.
YES
You should rep lace Jack Bo ard.
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
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 thoro ughly all path once again,
You should decid e to replace Main Board or not.
Check IC104.
Can you see the normal signal?
Check the output of TRQ105 in the Jack
Board.
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?
YES
YES
NO
Could you measure voltage of IC104 in the
Jack Bo ard & IIC lines?
Are they all normal?
YES
NO
You should check power line
& IIC lines.
YES
You should replace Jack Board.
NO
You should decid e to replace
TR Q105 in the Jack Board
or not.
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.
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