Read Sharp LC-22AD1E (serv.man6) Service Manual online
15
LC-22AD1E
Ye
s
No
No
No
No
Ye
s
No
No
No
No
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
No pictur
e, No sound
Fluor
escent lamp failur
e to light up
Chec
k all connection of each unit.
(Ref
er to o
v
er
all wir
ing diag
ram.)
Chec
k all the settings microprocessor's adjust process men
u.
Do F3701 and F3702
function?
Remo
v
e
F3701 and F3702 and
chec
k the load side
. Is there
shor
t-circuiting?
Is there shor
t-circuiting of
T3700 pr
imar
y side per
ipher
y,
IC3700, Q3706 and P3703?
Replace F3701 and F3702.
Chec
k
T3700's secondar
y side
per
ipher
y.
Are T3700's
secondar
y
outputs B31V
, B9V
, B5V and
B8V nor
mal?
Chec
k
T3700's pr
imar
y side
per
ipher
y.
Chec
k
T3700's pr
imar
y side
per
ipher
y,
Q3715 and their
per
ipher
al par
ts
.
Chec
k T3700's
secondar
y
load.
Does F6551, F6552, F6553
and F6554 function?
Replace F6551, F6552,
F6553 and F6554.
Is the pin(10) of lC4512 in the
"H" state?
Chec
k the OFL line
(Q3700,Q3711), IC4512 and
their per
ipher
al par
ts
.
Are the Q6564, Q6566,
Q6568 and Q6570 shor
t-
circuiting?
Chec
k Q6564, Q6566,
Q6568, Q6570 and their
per
ipher
al par
ts
.
Is T6551
~ T6554's
pr
imar
y
oscillator w
a
v
e
fo
rm
nor
mal?
Chec
k Q6551, Q6552, Q6554,
Q6555, Q6557, Q6558, Q6560,
Q6561 and connection cab
le
.
Replace the Fluorescent lamp
with ne
w one and chec
k again.
TROUBLE SHOOTING TABLE
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)
17
LC-22AD1E
No pictur
e
No SCAR
T1
(A
V1) output
No SCAR
T2
(A
V2) output
No S-V
ideo
(A
V3) output
Chec
k all the settings microprocessor's adjust process men
u.
Is output at
pin (17) of
IC2521
nor
mal?
Chec
k the
IC2521 and
its
per
ipher
al
par
ts
.
Chec
k the
IC2522, A
V1
line (SC1-
OUT
-V) and
their
per
ipher
al
Is input at
pin(27) of
IC2521
nor
mal?
Chec
k the
A
V1 line
(SC1-IN-V)
and their
per
ipher
al
par
ts
.
Is output at
pin (13) of
IC2521
nor
mal?
Chec
k the
IC2521 and
its
per
ipher
al
par
ts
.
Chec
k the
IC2523,
(SC2-OUT
-V)
and their
per
ipher
al
par
ts
.
Is input at
pins (5) and
(7) of IC2521
nor
mal?
Chec
k the
(SC3-IN-Y)
line
, (SC3-
IN-C) line
and their
per
ipher
al
par
ts
.
No line
output
Is input at pin
(72) of IC801
nor
mal?
Chec
k the
(SY
-OUT)
line and
their
per
ipher
al
par
ts
.
Ye
s
No
Ye
s
No
Ye
s
Ye
s
No
No
Is input at pin
(73) of IC801
nor
mal?
Chec
k the
V
-P
AL line
and their
per
ipher
al
par
ts
.
No
No
No
TELETEXT
output
Is input at
pins (1), (2)
and (3) of
IC801
nor
mal?
Chec
k
IC801 and
its
per
ipher
al
par
ts
.
Ye
s
Is output at
pins (3), (5)
and (6) of
IC1630
nor
mal?
Ye
s
Is output at
pins (57) ~
(60) of
IC1601
nor
mal?
Chec
k the
its line
.
No
Ye
s
Is input at pin
(21) of
IC1601
nor
mal?
Chec
k
IC1601,
IC1604 and
their
per
ipher
al
par
ts
.
No
Ye
s
Chec
k the its
line
.
(RMD1/TXD1)
No
Is input at
pin(29) of
IC2521
nor
mal?
Chec
k the
A
V2 line
(SC2-IN-V)
and their
per
ipher
al
par
ts
.
Ye
s
No
TROUBLE SHOOTING TABLE (Continued)
18
LC-22AD1E
No pictur
e
Becomes dark
Time passes,
becomes dark
Becomes white
Chec
k all the settings microprocessor's adjust process men
u.
Is source GND
nor
mal?
(SC4901,
SC4902)
Chec
k SC4901,
SC4902 and
their per
ipher
al
par
ts
.
Is CSCOM
wav
e
fo
rm
nor
mal?
(SC4901 1/2
Pin)
Chec
k IC4706,
IC4702, Q4701
and their
per
ipher
al par
ts
.
Is gate GND
nor
mal?
(SC4501)
Chec
k SC4501
and its
per
ipher
al par
ts
.
Is gate cloc
k
(GCK) nor
mal?
(SC4501 7Pin)
Chec
k FL4505,
R4540 and gate
arr
a
y
per
ipher
al
par
ts
. (IC4512
5Pin)
Is VEE-6V
being
outputted?
(SC4501
16~19Pin)
Chec
k lC4508
and its
per
ipher
al par
ts
.
Is V
GH+34V
being outputted?
(SC4501 3/4Pin)
Chec
k lC4507
and its
per
ipher
al par
ts
.
V
ertical line
output
Is VSH+3.3V
being
outputted?
(SC4901
8/9Pin)
Chec
k IC4703
and its
per
ipher
al par
ts
.
Ye
s
No
Ye
s
No
Ye
s
No
Ye
s
No
Is source cloc
k
nor
mal?
(SC4901 47Pin)
Chec
k IC4901
and gate ar
a
y
per
ipher
al par
ts
.
Ye
s
No
Is output of LBR
nor
mal?
(SC4901 10Pin)
Chec
k R4574,
IC4512 and
their per
ipher
al
par
ts
.
No
No
No
Is GSP
wav
e
fo
rm
nor
mal?
(SC4501
5/15Pin)
Chec
k FB4512,
FB4515 and
their per
ipher
al
par
ts
. (IC4512
7/3Pin)
Ye
s
No
No
TROUBLE SHOOTING TABLE (Continued)