50PZ950-UA, 50PZ950U-UA (CHASSIS:PU12A) - LG TV Service Manual (repair manual). Page 51

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Digital TV Video Trouble Shooting
Check RF Cable
Y
Check Tuner 5V,7V Power
IC500(7V),IC506(5V)
Replace IC500 or IC506
Y
N
Y
Check IF_P,IF_N (TU2103)
R17, P18
Maybe Tuner has problems
: Replace Tuner
Y
Check PDP Module 
Control board
Refer to Module CAS
15/39
N
N
Check  IC  
#62(TXAC1-) , #61(TXAC1+) ,
#46(TXAC2-) , #45(TXAC2+),
#30(TXAC3-) ,#29(TXAC3+) 
,#14(TXB4-) , #13(TXBC4+) 
Maybe BCM has problems
Replace IC3202
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