Read Sharp LC-28HM2E (serv.man2) Service Manual online
47
LC-28HM2
AN-28SP2
TROUBLE SHOOTING TABLE
(Continued)
No picture
Ye
s
No
No picture of video line and component line
signals
Are there normal outputs at
pins (3), (5) and (6) of IC406?
Check IC406 and its
peripherals.
Ye
s
No
Are there normal inputs at pins
(51), (52) and (53) of IC801?
Check the peripherals.
Ye
s
No
Are there normal outputs at pins
(41), (42) and (43) of IC801?
Check IC801 and its
peripherals.
Ye
s
No
Are there normal outputs at
pins (3), (7) and (11) of IC803?
Check RGB filter unit
(KA266N).
Ye
s
No
Are there signals at pins (1),
(2), (11), (12), (15), (16), (25)
and (26) of SC1408?
Ye
s
It is possible that display is
in trouble.
It is possible that PC I/F unit
(CPCi-0040CE) is in trouble.
Ye
s
No
No picture of video line signals
Are there normal
input/output on IC401?
Check IC401 and its
peripherals.
Ye
s
No
Are there normal outputs at
pins (83) and (84) of IC7001?
Check IC7001, IC7002 and
their peripherals.
Ye
s
No
Is there normal input at pin
(1) of IC407?
Check IC407 and the
peripherals of IC7003.
Ye
s
No
Are there normal inputs at
pins (13) and (15) of IC801?
Check IC407 and the
peripherals of IC801.
Ye
s
No
Are there normal outputs at
pins (4), (5) and (6) of IC801?
Check IC801 and its
peripherals.
No picture depending on color
system
Check the peripheral circuits of
IC801 (iX3323CE).
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