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1. TV/CATV doesn't display
Check TU1200.
Can you see the normal signal?
YES
Check the output of TR(Q1201).
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.
2. DTV doesn't display
Check the output data of TU1200 Pin 4,21,22.
Can you see the normal signal?
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.
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TROUBLESHOOTING
Could you measure voltage of TU1200 &
NO
IIC lines?
Are they all normal?
You should replace Main Board.
NO
You should decide to replace TR (Q1201) or not.
NO
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
NO
Could you measure voltage of TU1200 &
IIC lines?
Are they all normal?
You should replace Main Board.
NO
After checking the Power of Main IC(IC100) you
should decide to replace Main IC or not.
- 14 -
NO
You should check power line
YES
NO
You should check power line
YES
& IIC lines.
& IIC lines.
LGE Internal Use Only
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