Read Sharp LC-15L1E (serv.man8) Service Manual online
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
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