Read Sharp LC-22AD1E (serv.man6) Service Manual online
16
LC-22AD1E
No pictur
e
No pictur
e at
all
No TV
, A
V1,
A
V2 and A
V3
output
No TV output
Chec
k all the settings microprocessor's adjust process men
u.
Is in/output of
IC801 nor
mal?
Chec
k lC801
and its
per
ipher
al par
ts
.
Is in/output of
IC4601 nor
mal?
Chec
k IC4601
and its
per
ipher
al par
ts
.
Is in/out of
IC4512 nor
mal?
Chec
k lC4512
and its
per
ipher
al par
ts
.
Chec
k LCD
panel v
oltages
and w
a
v
e
fo
rm
.
Is in/output of
lC2521 nor
mal?
Chec
k IC2521
and its
per
ipher
al par
ts
.
Are input at pins
(71), (72) and
(73) of lC801
nor
mal?
Chec
k lC801
and its
per
ipher
al par
ts
.
Are v
oltages at
pins (6), (7) and
(18) of tuner
nor
mal?
Chec
k the po
w
er
line
.
Is output at pin
(13) of tuner
nor
mal?
Chec
k tuner and
its per
ipher
al
par
ts
.
Is intput at pin
(23) of IC2521
nor
mal?
Chec
k the its
line
.
Chec
k IC2521
and its
per
ipher
al par
ts
.
No DTV output
When input source change as
"TV" and "A
V1" to "A
V3",
Does the LCD displa
ys
correct video?
Chec
k the
Main2 (po
w
er)
par
t.
Ye
s
No
Ye
s
No
Ye
s
Ye
s
Is DTV men
u displa
y
ed when
press "DTV MENU" b
utton?
Ye
s
Chec
k the po
w
er
line
. (P3704 &
opposite side)
Chec
k cab
le
inser
tion.
(SC2500
& opposite side)
Does "W
eak or missing signal"
dialogue appears when
antenna cab
le remo
v
es?
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Exchange DTV
unit.
(T
uner par
t
prob
lem)
Is an
y ser
vice f
ound b
y
perf
or
ming "Reinstall all
ser
vices"?
Ye
s
Chec
k antenna
signal.
T
ry Softw
are
do
wnload via PC
card.
Still no video?
Exchange DTV
unit.
(DIgital unit
prob
lem)
No
No
No
No
No
Ye
s
No
Ye
s
No
No
Ye
s
No
Ye
s
No
TROUBLE SHOOTING TABLE (Continued)
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