LGE Internal Use OnlyCopyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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3. AV 1/2 doesn’t display
Check JK200, JK201
Can you see the normal waveform?
NO
JK200, JK201 may have problem. Replace this
Jack.
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 decid e to replace Main Board or not.
YES
Check JK304
Can you see the normal waveform?
Check the input of Component Audio
switch(IC405 in the Jack Bo ard),
Can you see the normal waveform?
Check the output of Component Audio
switch(IC405 in the Jack Bo ard) ,
Can you see the normal waveform?
YES
YES
YES
NO
JK304
may have problem. Replace this Jack.
NO
After checking the Power of compone nt Audio
switch, y ou should decide to replace component
Audio switch or not.
NO
After checking the Power of compone nt Audio
switch y ou should decide to replace component
Audio 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 thoro ughly all path once again,
You should decid e to replace Main Board or not.
