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1. TV/CATV doesn't display
Check TU1702.
Can you see the normal signal?
Check the output of TR(Q1703).
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.
2. DTV doesn't display
Could you measure voltage of IC1701 & IIC
lines?
Are they all normal?
Check the output data of TU1702 Pin 20,21,22
Can you see the normal signal?
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.
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TROUBLESHOOTING
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Could you measure voltage of TU1702 &
IIC lines?
Are they all normal?
YES
You should replace Main Board.
You should decide to replace TR (Q1703) or not.
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
You should check power line
& IIC lines.
Could you measure voltage of TU1702 &
IIC lines?
Are they all normal?
YES
You should replace Main Board.
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
- 13 -
NO
You should check power line
& IIC lines.
NO
You should check power line
& IIC lines.
LGE Internal Use Only
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