Read LG 42LC7D (CHASSIS:LB73A) Service Manual online
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Check J600 ,
Can you see the normal waveform?
YES
J600
may have problem. Replace this Jack.
After checking the Power of component switch,
you should decide to replace component switch
or not.
NO
Check the input of Component switch(IC707) ,
Can you see the normal waveform?
NO
YES
YES
YES
YES
After checking the Power of component switch
you should decide to replace component switch
or not.
Check the output of Component switch(IC707) ,
Can you see the normal waveform?
NO
After checking the Power of MST3361 you
should decide to replace MST3361 or not.
Check the input of MST3361(IC703 Pin41,44,46).
Can you see the normal waveform?
NO
After checking the Power of MST3361 you
should decide to replace MST3361 or not.
Check the output of MST3361(IC703 ).
Can you see the normal waveform?
NO
This board has big problem because Main
chip(HD2.4) have some troubles.
After checking thoroughly all path once again,
You should decide to replace HD2.4 or not.
Check the input and output of HD2.4(IC401).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
NO
RGB_PC doesn’t display
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