Hitachi 42PD8900TA Service Manual page 50

Sub Syncronization [Main PWB Circuit]
Trouble of Sub picture
No
Are waveform
at TP603(H) and
TP604(V)?
No
Are waveforms
at 45pin(H) and 48pin(V) of
I601?
No
Component Input?
Check I601 and Input terminal
No
(RF/Composit
Video/S-Video)
Are waveforms
at 33pin(H) and 34pin(V) of
I601?
No
RF or Composit Video ?
No
(S-Video)
Is
waveform at
44pin(Y) of I504?
No
Is
waveform at
56pin(Y) of I201?
No
Check I201 and Input terminal
42PD8900TA
Yes
Check FC PWB
Yes
Check I602
Yes
(Component Video)
Yes
Check I601
Yes
(RF or Composit Video)
Yes
53pin(CV) of I201?
Check I504
Yes
(Composit Video)
Check Q512
Check I201 and Input terminal
Is
Yes
waveform at
1pin(CV) of I504?
Check I504
No
Is
Yes
waveform at
Check Q206 and Q511
No
Yes (RF)
RF Input?
No
50
Is
Yes
waveform at
60pin(CV) of I201?
Check I201
No
Check U102