Read LG 42PG6HD-UA (CHASSIS:PU83A) Service Manual online
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Component doesn t display
Check JP7001,J7015.
Can you see the normal waveform?
Check the L700, L704.
Can you see the normal waveform?
Check the C638, C628 in front of BCM3553.
Can you see the normal waveform?
YES
YES
NO
JK700, JK702 may have problem. Replace this
Jack.
NO
Replace the Part (L700, L704)
NO
After check the pattern between L703 and C651,
You can suspect that PCB is bad.
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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