Hitachi 42PD9800TA Service Manual page 30

Main Picture [SUB PWB Circuit]
①Trouble of Main picture-A
S-Video Input ?
No
Is waveform at
27pin(CV) of PSM1?
No
Is waveform at
41pin(CV)
of IY01?
No
RF Input ?
No
Check IY01 and Input
42PD9800TA (FW1)
Yes (S-Video Input)
Yes
Check Main PWB
Yes
Check QY13
Yes(RF Input)
30
Are waveforms at
Yes
27pin(SY) and 33pin(SC)
of PSM1 ?
No
Are waveforms at
Yes
41pin(SY) and 45pin(SC)
of IY01?
No
Check IY01 and Input terminal
Is waveforms at
Yes
13pin(CV) of IY01?
No
Check UT01
Check Main PWB
Check QY06,QY13
Check IY01