Read Sharp LC-30HV4E (serv.man10) Service Manual online
59
LC-30HV4E
TROUBLE SHOOTING TABLE OF PC I/F UNIT
(AVC System)
NO
YES
No
TV
, video and component picture
Is input at pins (124),
(133) and (139) of IC4
nor
mal?
Chec
k CN6 and its
per
ipher
al circuits
.
NO
YES
Are TL207, TL208
and
TL211 nor
mal?
Chec
k CN6 and its
per
ipher
al circuits
.
NO
YES
Is digital output section of
IC4 nor
mal?
Chec
k IC4 and its
per
ipher
al circuits
.
NO
YES
Is digital output section
of IC310 nor
mal?
Chec
k IC310 and its
per
ipher
al circuits
.
NO
YES
Is digital output of IC25
nor
mal?
Chec
k IC25 and its
per
ipher
al circuits
.
No PC picture
YES
Is signal at pins (21), (22), (24), (25), (27), (28), (30) and (31)
of IC413? (The signal is of high frequency (a little less than
1GHz).
P
a
y due attention to it dur
ing obser
v
ation.)
Connecting cab
le or
monitor is prob
lem.
NO
PC I/F Unit (CPCi-
0056CE) inter
nal prob
lem
is lik
ely
.
No MAIN picture on single screen and dual screen.
No SUB picture on dual screen
NO
YES
Is input at pins (126),
(136) and (141) of IC4
nor
mal?
Chec
k CN8 and its
per
ipher
al circuits
.
NO
YES
Is digital output section
of IC4 nor
mal?
Chec
k IC4 and its
per
ipher
al circuits
.
NO
YES
Is digital output of IC25
nor
mal?
Chec
k IC25 and its
per
ipher
al circuits
.
No picture
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