Read Sharp LC-10A3E (serv.man3) Service Manual online
12
LC-10A3E
TROUBLE SHOOTING TABLE
No
No Power (Power LED indicator still in red)
Go to the adjustment process mode.
Move the cursor to ERROR NO RESET
and click on it (to reset to zero).
and click on it (to reset to zero).
Turn off the power.
Is the power turned on again?
1
+B-ADJ
160
MODEL
A3E
INCH SIZE
10
TIMER
1
NTSC PWM FREQ
OCO
PAL PWM FREQ
OBD
TV GAIN
OFF
ERROR NO RESET
5
PMUTE
00
Check the back light lamp, D753, D754, Q757,
Q3600-2 and their peripheral parts as well as pin
(42) of IC2001.
Q3600-2 and their peripheral parts as well as pin
(42) of IC2001.
Note:
This model is equipped with the lamp error detection function
that detects the current flowing into the fluorescent lamp and
protects the backlight lamp drive circuit.
If a lamp error is detected, the microprocessor interrupts the
unit and the ERROR NO RESET setting will go up.
When the ERROR NO RESET setting has reached "5", the
microprocessor turns and keeps off the unit's power. To
resume the power, take the above procedure to clear the
ERROR NO RESET setting.
that detects the current flowing into the fluorescent lamp and
protects the backlight lamp drive circuit.
If a lamp error is detected, the microprocessor interrupts the
unit and the ERROR NO RESET setting will go up.
When the ERROR NO RESET setting has reached "5", the
microprocessor turns and keeps off the unit's power. To
resume the power, take the above procedure to clear the
ERROR NO RESET setting.
13
LC-10A3E
TROUBLE SHOOTING TABLE
No picture
at all
Yes
No
Are inputs
and outputs
of IC802 as
specified?
Chec
k all the settings on the microprocessor
’s
adjust process men
u.
No picture
Chec
k IC802
and its
per
ipher
al
par
ts
.
Yes
No
Are inputs
and outputs
of IC1201 as
specified?
Chec
k
IC1201 and
its per
ipher
al
par
ts
.
Chec
k LCD
panel v
oltage
and
wav
e
fo
rm
.
No TV
and
VIDEO 1
output
Yes
No
Are inputs
and outputs
of IC402 as
specified?
Chec
k IC402
and its
per
ipher
al
par
ts
.
NO
Is input at Pin
(73) of IC802
as specified?
Chec
k IC802,
A
V1 line and
their
per
ipher
al
par
ts
.
No TV
output
Yes
No
Are v
oltages
at Pins (6),
(7) and (9) of
tuner as
specified?
Chec
k the
po
w
er line
.
Yes
No
Is output at
Pin (19) of
tuner as
specified?
Chec
k the
tuner and its
per
ipher
al
par
ts
.
No
Is input at Pin
(1) of IC402
as specified?
Chec
k the
line in
question.
Yes
Chec
k IC402
and its
per
ipher
al
par
ts
.
Yes
No
Are Pins (2)
and (4) of
IC402 at
“H”
and “L
”
respectiv
ely?
Are Pins (65)
and (66) of
IC2001 at
“H”
and “L
”
respectiv
ely?
No VIDEO
1 output
YES
No
Is input at Pin
(1) of IC402
as specified?
Chec
k the
line in
question.
Yes
No
Are Pins (1)
and (4) of
IC402 both at
“L
”?
No VIDEO
2 output
No
Is input at Pin
(74) of IC802
as specified?
Chec
k J3404,
A
V
line and
their
per
ipher
al
par
ts
.
No S
VIDEO
output
No
Are inputs at
Pins (71) and
(72) of IC802
as specified?
Chec
k
J3301, SY
line
, SC line
and
per
ipher
al
par
ts
.
Are Pins (65)
and (66) of
IC2001 both
at “L
”?
Chec
k IC402
and its
per
ipher
al
par
ts
.
Yes
Chec
k the
line in
question.
Yes
Chec
k the
line in
question.
14
LC-10A3E
TROUBLE SHOOTING TABLE
(Continued)
No picture and sound
No colour
No TV
colour
No S-VIDEO colour
Yes
No
Do F3701 and F3702
function?
Chec
k all the settings on the microprocessor’
s
adjust process men
u.
No
Are secondar
y outputs
(+38V
, +16V
, +9V
, +5V
, -8V)
of
T701 as specified?
Yes
Are the oscillation w
a
v
e
fo
rm
at
T701’
s
pr
imar
y side as
specified?
Yes
No
Disconnect F3701 and
F3702.
Is the load side
shor
t-circuited?
Yes
No
Is an
y of
T701’
s
pr
imar
y side
,
Q701, Q710 and S4701
shor
t-circuited?
Chec
k J3701, its per
ipher
al
par
ts and connection cab
le
.
Replace F3701 and F3702.
Chec
k S4701 and
connection cab
le
.
Chec
k the secondar
y-side
load of
T701.
Fluorescent lamp failure
Yes
No
Does F3751 function?
Yes
No
Is Pin (34) of IC1201 at
“H”?
Yes
No
Are the oscillation w
a
v
e
fo
rms
at the pr
imar
y side of
T751
and
T752 as specified?
Yes
Replace F3751.
No
Is input at Pin (71) of IC802
as specified?
Chec
k J3301, SC line and
per
ipher
al par
ts
.
Yes
Chec
k the line
, IC1201 and
its per
ipher
al par
ts
.
Chec
k Q751, Q752,
T751,
T752, Q753 and their
per
ipher
al par
ts
.
Replace the fluorescent lamp
and chec
k the oscillation
w
a
v
e
fo
rm
again.
No VIDEO
colour
Chec
k all the settings on the microprocessor’
s
adjust process men
u.
15
LC-10A3E
TROUBLE SHOOTING TABLE
(Continued)
No sound
fr
om
speaker
s
Yes
No
Is Pin (53) of
IC2001 at
“L
”?
Chec
k all the settings on the microprocessor’
s
adjust process men
u.
No sound
No
Are outputs at
Pins (1) and (7)
of IC903 as
specified?
Yes
No
Are inputs and
outputs of
IC303 as
specified?
Yes
No
Are inputs at
Pins (5) and (8)
as w
ell as
outputs at Pins
(2) and (11), all
of IC301, as
specified?
Muting eff
ect is
on.
Chec
k the
FSMU line
.
Chec
k IC901,
IC903 and their
per
ipher
al
par
ts
.
Chec
k IC303
and its
per
ipher
al
par
ts
.
Chec
k the line
in question,
IC303 and its
per
ipher
al
par
ts
.
Yes
Chec
k the
speak
ers and
their per
ipher
al
par
ts
.
No sound
fr
om
headphone
Yes
No
Is Pin (55) of
IC2001 at
“L
”?
Chec
k the
headphone and
its per
ipher
al
par
ts
.
Chec
k Q306,
J3404 and their
per
ipher
al
par
ts
.
No sound
fr
om output
line
Yes
No
Is Pin (52) of
IC2001 at
“L
”?
No
Are outputs at
Pins (1) and (7)
of IC902 as
specified?
Yes
Chec
k the line
in question.
Chec
k the
LMUTE line
.
Chec
k IC902
and its
per
ipher
al
par
ts
.
TV sound
failure
Yes
No
Is output at Pin
(16) of tuner as
specified?
No
Is input at Pin
(60) of IC901
as specified?
Chec
k the
tuner and its
per
ipher
al
par
ts
.
Chec
k IC901,
Q3301, Q3204,
Q3205 and
their per
ipher
al
par
ts
.
