Sharp LC-20S1E (serv.man17) Service Manual ▷ View online
21
LC-20S1E
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?
22
LC-20S1E
8
7
10
9
6
5
4
3
2
1
A
B
C
D
E
F
G
H
CHASSIS LAYOUT
R/C, LED Unit
TUNER Unit
INVERTER Unit
23
LC-20S1E
17
16
19
18
15
14
13
12
11
10
MAIN Unit
24
LC-20S1E
8
7
10
9
6
5
4
3
2
1
A
B
C
D
E
F
G
H
BLOCK DIAGRAM
ANTENNA
S
(AV2)INPUT
(AV2)INPUT
VIDEO
(AV2)INPUT
(AV2)INPUT
AUDIO
(AV2)INPUT
(AV2)INPUT
DC12V
KEY
Q3703
SCART
(AV1)
AUDIO IN
AUDIO OUT
VIDEO OUT
SDA/RXD
SCL/TXD
INPUT
VCC
+5V
+5V
+17V
+23V
+1.8V
+3.3V
+3.3V
+3.3V
B12V1A
+3.4V
+9V
+8V
+32V
–11V
+3.4V
VCC
SIGVCC
INV+B
SC_R/G/B
SC3902
J5000
J5001
J3300
SY
SY
SC_L/RO
TV_V
CVBS/SY_IN
DACM_L/R
DACA_L/R
SC2_OUT_L/R
VP
R/G/B_IN
SC_IN
VOUT
CSYNC
L_
SIF1
ANA_IN1+
SC2_IN_L/R
SC1_IN_L/R
SC1_OUT_L/R
AI_L/R
SC
V1_V
V1.L/R
I C/UART
2
I C
2
I C
UART
2
I C
2
I C
2
2
PWM IC3701
DC/DC
CONVERTER
T3701
REF IC706
REG IC2003
REG IC708
REG IC701
REG IC704
REG IC709
REG IC806
REG IC707
REG IC702
REG IC2004
Q3709
Q3707
Q3705
VOLTAGE
CONVERTER
IC705
CHROMA
SELECTOR
IC805
TV/AV
SELECTOR
IC802
AUDIO AMP
IC1901
AU
MSP
IC1900
TUNER
AMP
IC803(1/2)
VPC
IC801
MICON
IC2001
E PROM
IC2009
SYNC SEP
IC804
AMP
IC803(1/2)
IC3702
Q3708
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