Hitachi 42PD8900TA Service Manual page 49

Main Syincronization [Main PWB Circuit]
No Sync or Invalid Sync
Sub picture?
No
(Signal picture
or Main picture )
Are waveform at
TP601(H) and TP602(V)?
No
Are waveforms
at 61pin(H) and 58pin(V) of
I601?
No
RGB
Input(DTT,SCART) or
Component Input? (except
480i and 576i)
No
(Component Video for 480i, 576i
/RF/Composit Video/S-Video)
Are waveforms
at 31pin(H) and 32pin(V) of
I601?
No
RF or Composit Video ?
No
(Component Video for 480i, 576i
/S-Video)
Component
Video for 480i, 576i?
No
(S-Video)
Is
waveform at
150pin(Y) of I501?
No
Is
waveform at
44pin(Y) of I201?
No
Check I201 and Input terminal
42PD8900TA
Yes(Sub picture)
Trouble of Sub picture
Yes
Check FC PWB
Yes
Check I602
Yes
(Component Video
except 480i and 576i)
Check I601 and Input terminal
Yes
Check I601
Yes (RF or Composit Video)
Yes
(Component Video
for 480i and 576i)
Yes
Check I501
Yes
Check Q207, Q217,
Q218, Q219
Is
Yes
waveform at
148pin(CV) of I501?
No
Is
Yes
waveform at
44pin(CV) of I201?
Check Q207, Q217, Q218, Q219
No
Yes (RF)
RF Input?
No
(Composit Video)
Check I201 and Input terminal
Is
Yes
waveforms at
152pin(Y) of I501?
No
Yes
Is waveform at
6pin(Y) of I204?
No
Are waveforms at
8pin(Y) from AV1 or 9pin(Y), from
AV2 of I204?
No
Check Input terminal
49
Check I501
Is
waveform at
63pin(CV) of I201?
No
Check U101
Check I501
Check Q214
Yes
Check I204
Yes
Check I201