Hitachi 37LD8800TA, Service Manual

Page: 46 / 128

46
55PD8800/37LD8800
No picture, no color or dark
Sub picture?
㽲
Trouble of Sub picture
No (Si
g
nal
p
icture or Main
p
icture
)
Are waveform at TP605(Y),
TP606
(Cb
),
and TP607
(Cr
)?
Are waveforms at
64pin(Y), 62pin(Cb),
a
n
d
60p
in
(C
r)o
f I
60
1
?
Check FC PWB, LVDS
Yes(Sub picture)
No
Yes
Check Q601, Q602, Q603
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
72pin(Y), 74pin(Cb),
a
n
d
7
6p
in
(C
r)o
f I
60
1
?
Check I601
Are waveforms at
62pin(Y), 65pin(Cb),
a
n
d
68p
in
(C
r)o
f I
50
1
?
Check Q520, Q521, Q522
Component Video
for 480i
, 576i ?
No (Component Video for 480i, 576i /RF/Composit Video/S-Video)
Yes (Component Video for 480i and 576i)
Are waveforms at
152pin(Y), 162pin(Cb),
and 170pin(Cr) of I501?
Yes Yes
Yes
Check I501
Are waveforms at 6pin(Y), 5pin(Cb),
a
n
d3
p
in
(C
r)o
f I2
0
4?
Yes
Check Q214, Q215, Q216
Are waveforms at
8pin(Y), 11pin(Cb),
and 16pin(Cr) from AV1 or
9pin(Y), 14pin(Cb),
and 1pin(Cr) from AV2
of I204?
Check I204
Check Input terminal
No No
RF or Composit Video ?
Is waveform at
148pin(CV) of I501?
Yes (RF or Composit Video)
Are waveforms at
150pin(Y) and 158pin(C)
o
f I
50
1?
Yes
No
No No
No (Component Video for 480i, 576i /S-Video)
No (S-Video)
Yes
Check I501
Yes
Check I501
Are waveforms at
44pin(Y) and 47pin(C)
o
f I2
0
1?
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 Picture [Main PWB Circuit
]