Sharp AQUOS LC-22AD1E, Service Manual

Page: 16 / 111

16
LC-22AD1E
TROUBLE SHOOTING TABLE (Continued)
No picture
No picture at all
No TV
, A
V1,
A
V2 and A
V3
output
No TV output
Chec
k all the settings microprocessor’s adjust process menu.
Is in/output of IC801 nor
mal?
Chec
k lC801
and its per
ipheral par
ts
.
Is in/output of IC4601 nor
mal?
Chec
k IC4601
and its per
ipheral par
ts
.
Is in/out of IC4512 nor
mal?
Chec
k lC4512
and its per
ipheral par
ts
.
Chec
k LCD
panel v
oltages
and
wave
fo
rm
.
Is in/output of lC2521 nor
mal?
Chec
k IC2521
and its per
ipheral par
ts
.
Are input at pins (71), (72) and (73) of lC801 nor
mal?
Chec
k lC801
and its per
ipheral par
ts
.
Are v
oltages at
pins (6), (7) and (18) of tuner nor
mal?
Chec
k the po
wer
line
.
Is output at pin (13) of tuner nor
mal?
Chec
k tuner and
its per
ipheral
par
ts
.
Is intput at pin (23) of IC2521 nor
mal?
Chec
k the its
line
.
Chec
k IC2521
and its per
ipheral 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
wer)
par
t.
Ye
s
No
Ye
s
No
Ye
s
Ye
s
Is DTV menu displa
y
ed when
press "DTV MENU" b
utton?
Ye
s
Chec
k the po
wer
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