Read LG 42PG6HD-UA (CHASSIS:PU83A) Service Manual online
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Video doesn t display
Check JP7004.
Can you see the normal waveform?
Check the Registor(R732).
Can you see the normal waveform?
YES
YES
NO
JK701 may have problem. Replace this
Jack.
Check the C651 in front of BCM3553 chip.
Can you see the normal waveform?
NO
replace Part(R732).
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.
NO
After check the pattern between R703 and C651,
You can suspect that PCB is bad.
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