Read LG 42PG6HD-UA (CHASSIS:PU83A) Service Manual online
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HDMI doesn t display
Check input connect JK602.
Can you see the normal waveform?
Check DDC communication lines(IC601
Pin5,6)
Check the input of PI3HDMI341ART(IC600),
& IC703(TMDS141RHAR, HDMI4)
This signal is TMDS.
Can you see the normal waveform?
YES
YES
NO
JK602 may have problem. Replace this Jack.
Check the output of PI3HDMI341ART(IC600
) & IC703(TMDS141RHAR, HDMI4).
Can you see the normal waveform?
YES
Check the input and output of BCM3553.
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
NO
NO
After checking the trace of TMDS lines and power of
PI3HDMI341ART & IC703(TMDS141RHAR, HDMI4), you
should decide to replace PI3HDMI341ART &
IC703(TMDS141RHAR, HDMI4) or not.
NO
YES
This board has big problem because Main
chip(BCM3550) have some troubles.
After checking thoroughly all path once again,
You should decide to replace BCM3550 or not.
After checking the Power of this chip, you
should decide to replace this or not.
After checking the Power of PI3HDMI341ART or
TMDS141RHAR. you should decide to replace
PI3HDMI341ART & TMDS141RHAR or not.
YES
Check HDCP communication lines(IC102
Pin5,6)
NO
After checking the Power of this chip, you
should decide to replace this or not.
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