Read Sharp LC-15L1E (serv.man8) Service Manual online
18
LC-15L1E
TROUBLE SHOOTING TABLE
No picture and no sound at all
(When using A
C
adapter)
Chec
k that micr
ocomputer adjustment pr
ocess men
u
is set correctl
y
.
No fluorescent lamp lighting
Is F3801 normal?
Replace F3801.
Is F3804 normal?
Replace F3804.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Is loaded-side shor
t-circuited
when F3801 is remo
v
ed?
Are T3701
secondar
y
outputs +34V
, +9V
, +5V and
-11V nor
mal?
Is oscillation w
a
v
e
fo
rm
nor
mal at
T3701 pr
imar
y?
Chec
k T3701
secondar
y
loading.
Chec
k J9901 per
ipher
y and
connector cab
le
.
Chec
k S4050 and connector
cab
le
.
Is pin (120) of IC1201 at "H"
le
v
el?
Replace and chec
k
fluorescent lamp
.
Is oscillation w
a
v
e
fo
rm
nor
mal at pr
imar
y of
T6501,
T6502,
T6503 and
T6504?
Chec
k Q6501, Q6502,
Q6503, Q6504, Q6511,
Q6512, Q6513, Q6514,
T6501, T6502, T6503, T6504
and their per
ipher
ies
.
Chec
k rele
v
ant line
, IC1201
and per
ipher
y.
Are Q3807 and Q3803
nor
mal?
Are
T3701 pr
imar
y per
ipher
y,
Q3703, Q3705 and S4050
shor
t-circuited?
19
LC-15L1E
TROUBLE SHOOTING TABLE
(Continued)
No picture and no sound at all
(When using batter
y)
Chec
k that micr
ocomputer adjustment pr
ocess men
u is set correctl
y
.
Is F9001 nor
mal?
Replace F9001.
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
No po
wer (Normal operation with A
C
adapter)
Is batter
y v
oltage (1.8-2.2V) present at pin (94) of IC2001?
Is temper
ature detection v
oltage (0.5-1.8V) present at pin (93) of IC2001?
Is batter
y detection of pin (68) of IC2001 at "L" le
v
el?
Are pins (2) and (4) of Q3806 at "L" le
v
el?
Chec
k IC2011, F9001, batter
y and their per
ipher
ies
.
Chec
k IC2011, batter
y and their per
ipher
ies
.
Chec
k IC2011, batter
y and their per
ipher
ies
.
Chec
k Q3801, Q3802 and their per
ipher
ies
.
Chec
k Q3806.
No operation with batter
y
Is loaded side shor
t-
circuited when F9001 is remo
v
ed?
Are T3701
secondar
y
outputs +34V
, +9V
,
+5V and -11V nor
mal?
Is oscillation w
a
v
e
fo
rm
nor
mal at
T3701
pr
imar
y?
Chec
k T3701
secondar
y loading.
Chec
k P9004
per
ipher
y and
connector cab
le
.
Chec
k S4050 and
connector cab
le
.
Are Q3806 and Q3801 nor
mal?
Are T3701
pr
imar
y
per
ipher
y,
Q3703,
Q3705 and S4050 shor
t-circuited?
20
LC-15L1E
TROUBLE SHOOTING TABLE
(Continued)
No picture (1/2)
No picture at all
No picture f
or
TV
No picture f
or
Video 1
No picture f
or
Video 2
Chec
k that micr
ocomputer adjustment pr
ocess men
u
is set correctl
y
.
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
No SCAR
T R/G/B
NO
NO
YES
YES
YES
YES
YES
No picture f
or
Video 3
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
No picture (2/2)
Chec
k that micr
ocomputer adjustment pr
ocess men
u is set correctl
y
.
NO
NO
No colour
No colour f
or
TV
No colour f
or
Video 2
No colour f
or
Video 3
No colour f
or
Video 1
No colour f
or
Video 4
Chec
k that micr
ocomputer adjustment pr
ocess men
u
is set correctl
y
.
NO
No picture f
or
TV
, Video
1,
Video 2 and
Video 3
No picture
Is IC801
I/O
nor
mal?
Is IC1201
I/O
nor
mal?
Chec
k LCD panel
voltage and w
a
ve
fo
rm
.
Chec
k
IC801 and
per
ipher
y.
Are inputs
at pins (2),
(3) and (4)
of IC5408
normal?
Are inputs
at pins (1),
(2), (3) and
(79) of
IC5401
nor
mal?
Chec
k outputs
at pins (40),
(39), (38), (37),
(34), (33), (32)
and (31)
of IC5401.
Chec
k
IC5408 and
per
ipher
y.
Is IC5402
I/O
normal?
Is input at
pin (73) of
IC5401
nor
mal?
Chec
k
IC5402 and
per
ipher
y.
Chec
k
po
w
er line
.
Chec
k
rele
v
ant
line
.
Chec
k
rele
v
ant
line
.
Is input at
pin (7) of
IC5402
nor
mal?
Chec
k
rele
v
ant
line
.
Is input at
pin (12) of
IC5402
nor
mal?
Are inputs
at pins (72)
and (73) of
IC801
nor
mal?
Chec
k SY
line
, SC line
and
per
ipher
ies
.
Chec
k
IC5402 and
per
ipher
y.
Is IC5402
output
nor
mal?
Chec
k
IC5402 and
per
ipher
y.
Is IC5402
output
nor
mal?
Chec
k
IC5402 and
per
ipher
y.
Is IC5402
output
nor
mal?
Chec
k
tuner and
per
ipher
y.
Is input at
pin (9) of
IC5402
nor
mal?
Chec
k
rele
v
ant
line
.
No
Video 1 output
fr
om SCAR
T1
Is output at pin (5)
of IC5202 nor
mal?
Chec
k IC5202 and
its per
ipher
y.
Is output at pin (4)
of IC5202 nor
mal?
Chec
k IC5202 and
its per
ipher
y.
NO
Is output at pin (19)
of SCAR
T nor
mal?
Chec
k rele
v
ant line
.
NO
Is output at pin (40)
of SCAR
T nor
mal?
Chec
k rele
v
ant line
.
No
Video 2 output
fr
om SCAR
T2
Chec
k
IC5402 and
per
ipher
y.
Are v
oltages
at pins (1),
(13) and (15)
of tuner
nor
mal?
Is output at
pin (23) of
tuner nor
mal?
Is IC5402
output
nor
mal?
Check
relevant line.
Is input at
pin (47) of
IC5402
nor
mal?
Chec
k
rele
v
ant
line
.
Chec
k
IC5401 and
per
ipher
y.
Chec
k
IC1201 and
per
ipher
y.
Is IC801 input nor
mal?
Chec
k IC801 and per
ipher
y.
21
LC-15L1E
TROUBLE SHOOTING TABLE
(Continued)
No sound
No sound fr
om both speaker
s
No sound from headphone?
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
消音を
Chec
k X3201 per
ipher
y.
Chec
k IC3201 per
ipher
y.
No sound in all input modes (TV and
Video
1/2/3/4)?
Chec
k the f
o
llo
wing.
1
Is the v
o
lume not lo
w?
2
Is the set not m
u
ted?
3
Is headphone not inser
ted?
Is v
o
ltage nor
mal at pin (9) (po
w
er input ter
m
inal)
of IC3206? (Appro
x
. +15V)
Is v
o
ltage nor
mal at pin (5) (standb
y control
ter
m
inal) of IC3206? (Appro
x
. +1.8V)
Is control signal input a
vailab
le at each pin of IC3201?
Pin (2) of IC3201 SCL1
Pin (3) of IC3201 SD
A1
Is oscillation w
a
ve
fo
rm
nor
mal at pins (71) and (72) of
IC3201?
Is audio signal output a
vailab
le at pins (27) (Rch) and
(28) (Lch) of IC3201?
Chec
k pins (27) (Rch) and (28) (Lch) of IC3201 up to
pins (4) (Rch) and (2) (Lch) of IC3206, as w
ell as the
per
ipher
ies of IC3204, IC3205 and IC3207.
Is po
w
e
r v
o
ltage nor
mal in each circuit?
Pin (8) of IC3204, IC3205 and IC3207, and pin
(39) of IC3201 Appro
x
. +8V
Pins (11), (12), (13), (65) and (66) of IC3201
Appro
x
. +5V
Chec
k again after doing the f
o
llo
wing.
1
Raise the v
o
lume
.
2
Cancel the m
u
te
.
3
Remo
v
e
the headphone
.
Chec
k headphone jac
k, speak
er and
speak
er cab
le
.
Chec
k A
C
adapter up to pin (7) of IC3206.
Chec
k pin (56) of IC2001 up to Q3206.
Chec
k pins (25) and (26) of IC2001 up to
pins (2) and (3) of IC 3201.
Chec
k the f
o
llo
wing.
+8V line
....Chec
k Q3713 per
ipher
y up to
pin (8) of IC3204, IC3205 and
IC3207, and pin (39) of
IC3201.
+5V line
....Chec
k
T3701 output
B5V500MA line up to each
+5V input pin of IC3201.
Chec
k the f
o
llo
wing.
1
No
TV sound....Chec
k the per
ipher
ies
of Q5212, Q5213, Q5214 and
TU5201.
2
No
Video 1 sound....Chec
k pins (2)
and (6) of SCAR
T up to pins (57) and
(56) of IC5901.
3
No
Video 2 sound....Chec
k pins (22)
and (27) of SCAR
T up to pins (54)
and(53) of IC5901.
4
No
Video 3 sound....Chec
k J5201 up
to pins (51) and (50) of IC5901.
5
No
Video 4 sound....Chec
k J3201 up
to pins (54) and (53) of IC3201.
Chec
k that micr
ocomputer adjustment pr
ocess men
u is set correctl
y
.
NO
NO
No A
udio 1 output
fr
om SCAR
T1
Are outputs at pins
(36) and (37) of
IC5901 nor
mal?
Chec
k IC5901 and
its per
ipher
y.
Are outputs at pins
(33) and (34) of
IC5901 nor
mal?
Chec
k IC5901 and
its per
ipher
y.
NO
Are outputs at pins
(7) and (1) of IC5903
nor
mal?
Chec
k rele
v
ant line
.
NO
Are outputs at pins
(7) and (1) of IC5902
nor
mal?
Chec
k rele
v
ant line
.
NO
Are outputs at pins
(1) and (3) of SCAR
T
nor
mal?
Chec
k rele
v
ant line
.
NO
Are outputs at pins
(22) and (24) of
SCAR
T nor
mal?
Chec
k rele
v
ant line
.
No A
udio 2 output
fr
om SCAR
T2