Hitachi 42PD7500, Service Manual

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32
42PD7500
/ 42PD7500A
(PW2)
Picture
[Video PWB Circuit]
No picture, no color or dark
Ԙ
Trouble of Sub picture
Sub picture ?
YES (Sub picture)
Are waveforms at
TP65(Y), TP66(Cb)
and TP67(Cr) ?
NO
Check Formatter PWB
YES
NO
Are waveforms at
64pin(Y), 62pin(Cb)
and 60pin(Cr) of I601?
Check Q603, Q604 and Q605
YES
NO
Component or
RGB-Video Input ?
Check I601 and Input terminals
YES (Component Video/RGB-Video)
NO
(RF/Composite Video/
S-Video/HDMI)
Are waveforms at
72pin(Y), 74pin(Cb)
and 76pin(Cr) of I601?
Check I601
YES
NO
Are waveforms at
21pin(Y), 22pin(Cb)
and 23pin(Cr) of I501?
Check Q508, Q509 and Q510
YES
NO
NTSC or PAL ?
<RF/Composite Video>
YES (NTSC/PAL<RF/Composite Video>)
NO
(S-Video/SECAM)
SECAM ?
<RF/Composite Video>
YES (SECAM<RF/Composite Video>)
NO
(S-Video)
Are waveforms at
5pin(Y) and 7pin(C) of
I501?
Check I501
Are waveforms at
TP32(Y) and
TP33(C)?
YES
NO
Check Q304, Q305, Q306, Q307,
Q308, Q309,Q501,Q503
YES
NO
HDMI Input ?
YES (HDMI)
NO
(RF/Composite Video/S-
Video)
Are waveforms at
25pin(Y), 27pin(Cb)
and 29pin(Cr) of I601?
Check I601
Check HDMI PWB
YES
NO
Is waveform at
44pin(CV) of I501?
Check I501
YES
NO
Is waveform at
44pin(CV) of I201?
Is waveform at
TP31(CV) ?
Check I302
YES
NO
Check Q211, Q301, Q302, Q303
RF Input ?
YES
NO
Check I201 and TUNER PWB
YES (RF)
NO
(Composite Video)
Check I201 and Input terminal
Are waveforms at
44pin(Y) and 43pin(C)
of I501?
Check I501
Are waveforms at
44pin(Y) and 47pin(C)
of I201?
YES
NO
Check Q211, Q504
and Q505
Check I201 and Input terminal
YES
NO
Is waveform at
44pin(CV) of I201?
Check Q211 and Q504
YES
NO
(Single picture or Main)