Read LG 42PG60-UA (CHASSIS:PU83A) Service Manual online
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TROUBLE SHOOTING GUIDE
Check JP7032,JP7033,JP7034.
Can you see the normal waveform?
Check the C635, C636, C637 in front of
BCM3553.
Can you see the normal waveform?
YES
NO
JK705 may have problem. Replace this Jack.
NO
After check the pattern between input of
BCM3553 and JK705 ,
You can suspect that PCB is bad.
RGB_PC doesn t display
Check JP7029,JP7030.
Can you see the normal waveform?
YES
NO
JK705 may have problem. Replace this Jack.
YES
This board has big problem because Main
chip(BCM3553) have some troubles.
After checking thoroughly all path once again,
You should decide to replace BCM3553 or not.
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