Read LG 32LH70 (CHASSIS:LA92D) Service Manual online
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3. AV 1/2 doesn’t display
Check JK200 in the Jack Board.
Can you see the normal waveform?
NO
JK200 may have problem. Replace this Jack.
Check the input of A/V Audio switch
(IC405 in the Jack Board),
Can you see the normal waveform?
YES
NO
After checking the Power of A/V Audio switch,
You should decide to replace component
Audio switch or not
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 thoroughly all path once again,
You should decide to replace Main Board or not.
YES
Check the output of A/V Audio switch
(IC405 in the Jack Board),
Can you see the normal waveform?
NO
After checking the Power of A/V Audio switch,
You should decide to replace component
Audio switch or not
4. Component doesn’t display
Check JK200
Can you see the normal waveform?
Check the input of Component Audio
switch(IC405 in the Jack Board) ,
Can you see the normal waveform?
Check the output of Component Audio
switch(IC405 in the Jack Board) ,
Can you see the normal waveform?
YES
YES
YES
NO
JK200
may have problem. Replace this Jack.
NO
After checking the Power of component Audio
switch, you should decide to replace component
Audio switch or not.
NO
After checking the Power of component Audio
switch you 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 thoroughly all path once again,
You should decide to replace Main Board or not.
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