LG M227WD - AV Input Display Issues

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Only for training and service purposes
LGE Internal Use Only
C
2008
- 21 -
Check JK600,JK601,JK705,JK706
Can you see the normal
waveform?
Check the input of Video
switch(IC701).
Can you see the normal waveform?
YES
NO
JK600,JK601,JK705,JK706 may
have problem. Replace this Jack.
NO
After checking the Power of AV switch
you should decide to replace AV 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.
YES
AV1/AV2/AV3 doesn t display