Sharp LC-15S1E (serv.man17) Service Manual ▷ View online
21
LC-13S1E
LC-15S1E
LC-15S1E
TROUBLE SHOOTING TABLE
(Continued)
No sound (1/2)
Check all the settings microprocessor's adjust process menu.
Is the pin (53) of
IC2001 in the
"L" state?
Is output at pins
(27) and (28) of
IC1900 normal?
Yes
Yes
No
No
No
No sound
from front
speakers
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC1900
and its
peripheral parts.
Is the pin (52) of
IC2001 in the
"L" state?
Is output at pins
(24) and (25) of
IC1900 normal?
Is output at pins
(1) and (7) of
IC350 normal?
Yes
Yes
No
No
No
Yes
Muting effect is
on. Check the
HP_MUTE line.
Check IC1900
and its
peripheral parts.
Check IC350
and its
peripheral parts.
No sound
from
headphone
TV sound
failure
Is output at pins
(33) and (34) of
IC1900 normal?
Is output at pins
(1) and (7) of
IC3500 normal?
Check IC1900
and its
peripheral parts.
Check IC3500
and its
peripheral parts.
Yes
No
No
No
No sound
from output
line
Check the tuner
and its
peripheral parts.
Yes
No
Is output at pin
(11) of Tuner
normal?
Is input at pin
(67) of IC1900.
Check IC1900
and its
peripheral
parts.
Check
Headphone Jack
and connection
cable.
No
Is output at pins
(8) and (12) of
IC3301 normal?
Check IC3301
and its
peripheral parts.
Check front
speaker and
connection
cable.
Yes
Is output at pins (1)
and (7) of IC1902,
IC1903 and IC1904
normal?
Check IC1902,
IC1903, IC1904 and
their peripheral parts.
22
LC-13S1E
LC-15S1E
LC-15S1E
TROUBLE SHOOTING TABLE
(Continued)
No sound (2/2)
Check all the settings microprocessor
’s adjust process menu.
Yes
No
No
No sound from SCART
No
SCART sound failure
Yes
No
Check IC1900 and its
peripheral parts.
Is output at pins (36) and (37) of
IC1900 normal?
Check IC1901 and its
peripheral parts.
Is output at pins (1) and (7) of
IC1901 normal?
Check their lines and their
peripheral parts.
Is input at pins (53) and (54) of
IC1900 normal?
Check IC1900 and its
peripheral parts.
Is output at pins (27) and (28) of
IC1900 normal?
23
6
5
4
3
2
1
A
B
C
D
E
F
G
H
LC-13S1E
LC-15S1E
LC-15S1E
CHASSIS LAYOUT
R/C, LED Unit
SUB Unit
MAIN Unit
24
8
7
10
9
6
5
4
3
2
1
A
B
C
D
E
F
G
H
LC-13S1E
LC-15S1E
LC-15S1E
BLOCK DIAGRAM
ANTENNA
SC3902
SCART
(AV1)
AUDIO IN
AUDIO OUT
VIDEO OUT
SDA/RXD
SCL/TXD
VIDEO IN
SC_R/G/B
I
2
C/UART
S
J5000
(AV2) INPUT
VIDEO
J5001
(AV2) INPUT
DC12V
KEY
J3300
INPUT
VCC
AUDIO
(AV2) INPUT
INV+B
SIGVCC
VCC
V1.L/R
V1_V
SY
TUNER
SIF1
AI_L/R
ANA_IN1+
SC2_IN_L/R
DACM_L/R
DACA_L/R
SC2_OUT_L/R
I
2
C
I
2
C
I
2
C
I
2
C
SC1_OUT_L/R
SC1_IN_L/R
SC_L/RO
TV_V
SY
AUDIO AMP
AMP
CHROMA
SELECTOR
SELECTOR
TV/AV
IC802
IC803(1/2)
AMP
IC803(1/2)
IC1901
AUD
I
E
2
PROM
IC2009
MICON
IC2001
SYNC SEP
IC804
VPC
IC801
MSP
IC1900
IC805
SC
VPC_
SYN
CONTR
RES
L_ER
CSYNC
UART
VOUT
CVBS/SY_IN
R/G/B_IN
SC_IN
REG IC2003
REG IC706
PWM IC3701
Q3703
REG IC702
REG IC709
REG IC710
REG IC704
Q3705
Q3708
IC3702
Q3707
VOLTAGE
CONVERTER
IC705
REG IC707
REG IC806
REG IC708
Q3709
DC/DC
CONVERTER
T3701
REG IC2004
+3.3V
+5V
+3.4V
+34V
+9V
+32V
—11V
—
+23V
+17V
—
+5V
+3.
+2.
+8V
+5V
+1.8V
+3.3V
+3.3V
B12V1A
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