Read LG 42PG3HD-UA (CHASSIS:PU84A) Service Manual online
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Component / RGB / AV Audio Trouble Shooting
Check video output
Y
Follow procedure external
input video trouble shooting
N
Check Connector
JK602 / JK603 (Component)
JK607 (RGB)
JK601 / JK604 (AV Rear, AV Side)
Replace connector
N
Y
Check signal
R618 / R619 (Component1)
R645 / R646 (Component2)
R654 / R655 (RGB)
R6092 / R6094 (AV Rear)
R6090 / R6096 (AV Side)
Replace it
N
Y
Check IC602 power #14pin#
14pin
voltage level 5V
Replace it
N
Y
Check Audio out signal
IC602 #2,3 #9,10
Replace it or IC602
N
Y
Check IC100 signal
C102, C103, C104, C105, C176, C182
Replace it
N
Y
Check I2S signal
R1035, R1037, R1038
Replace it or IC100
N
Y
Check Audio clock
R1036
Replace it
N
Y
Maybe
Mstar has problems
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