Read LG 42PG3HD-UA (CHASSIS:PU84A) Service Manual online
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Digital TV Video Trouble Shooting
Check RF Cable
Check TP Clock, Data, Sync
R440, R441, R442
Maybe Tuner(TU400) has problems
Check Mstar LVDS output
#33(TXAC-) , #32(TXAC+) ,
#17(TXBC-) , #16(TXBC+)
Y
N
Check Tuner 5V Power
IC703 #5 Pin
Replace IC703
Y
N
Y
Maybe Mstar(IC100) has problems
N
Y
Check LD400 color
Bad Tuner. Replace Tuner.
None
Yellow --> none
Check Demodulator Input Clock
X400 (25MHz)
Replace it
N
Y
Check PDP Module
Control board
Refer to Module CAS
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