Read LG Z42PT320-UC (CHASSIS:PU14K) Service Manual online
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Check RF Cable
Check TP Clock, Data, Sync
AR401
Maybe Tuner has problems
: Replace Tuner
Y
N
Check Tuner Power
IC306 2pin 3.3V
IC307 2pin 1.8V
IC307 2pin 1.8V
Replace IC306 or IC307
Y
N
Y
Replace Mstar(IC1) has problems
N
Y
Check LD401 color
Bad Tuner. Replace Tuner.
None
Green
Check Demodulator Input Clock
X402 (25MHz)
Replace it X402
N
Y
Check PDP Module
Control board
Refer to Module CAS
Check P701 or P703
#21(RA2+) , #22(RA2-) ,
#19(RB2+) , #20(RB2-)
Digital TV Video
Trouble Shooting Guide
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