42PQ1100-ZE (CHASSIS:PD92A) - LG TV Service Manual (repair manual). Page 42

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Making 
Revision 
2009. 2 . 1
2/14
PDP TV
Input
Block
Digital TV Video Problem
Check RF Cable
Check TP Clock, Data, Sync
Maybe Tuner has problems
: Replace Tuner
Y
N
Check 5V voltage
on IC500, IC501(Chip Tuner)
Replace IC500 or IC501
Y
N
Y
Replace Mstar(IC100) has 
problems
N
Y
Check  color
Bad Tuner. Replace Tuner.
None
Green
Check Demodulator Input Clock
X501 (31.875MHz)
Replace it X501
N
Y
Check PDP Module 
Control board
Refer to Module CAS
Check P400 or P403
#17(CKM) , #18(CKP) , 
#32(CKP) , #33(CKM)
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