Hitachi 37LD8800TA, Service Manual

Page: 48 / 128

48
55PD8800/37LD8800
No Sync or Invalid Sync
Sub picture?
㽳
Trouble of Sub picture
No (Si
g
nal
p
icture or Main
p
icture
)
Are waveform at
TP601(H) and
TP
60
2
(V
)?
Are waveforms at
61pin(H) and 58pin(V)
o
f I
60
1?
Check FC PWB
Yes(Sub picture)
No
Yes
Check I602
Component Input?
(exce
p
t 480i and 576i
)
No
Check I601 and Input terminal
Yes Yes (Component Video except 480i and 576i)
Are waveforms at
31pin(H) and 32pin(V)
o
f I
60
1?
Check I601
Component Video
for 480i, 576i ?
No (Component Video for 480i, 576i /RF/Composit Video/S-Video)
Yes (Component Video for 480i and 576i)
Is waveforms at
152pin(Y) of I501?
Yes
Yes
Check I501
Is waveform at
6pin(Y) of I204?
Yes
Check Q214
Are waveforms at
8pin(Y) from AV1 or
9pin(Y) from AV2
of I204?
Check I204
Check Input terminal
No
RF or Composit Video ?
Is waveform at
148
p
in
(CV
) of I501?
Yes (RF or Composit Video)
Is waveform at
150pin(Y) of I501?
Yes
No
No No
No (Component Video for 480i, 576i /S-Video)
No (S-Video
)
Yes
Check I501
Yes
Check I501
Is waveform at
44pin(Y) of I201?
Yes
Check Q207, Q217, Q218, Q219
No
Check Q207, Q217, Q218
Is waveform at
44pin(CV) of I201?
No
No No
Check I201 and Input terminal
Yes
RF Input?
Check I201 and Input terminal
No(Composit Video)
Yes (RF)
Is waveform at
63pin(CV) of I201?
Yes
Check I201
No
Check U101
Main Syincronization [Main PWB Circuit
]