Sharp LC-15B5E Service Manual ▷ View online
25
LC-15B5E
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
Check IC3201
and its peripheral
parts.
Is output at pins
(36) and (37) of
IC3201 normal?
Check IC3210
and its peripheral
parts.
Is output at pins
(1) and (7) of
IC3210 normal?
Check their lines
and their
peripheral parts.
Is input at pins
(2) and (4) of
IC3401 normal?
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
IC3201 normal?
Yes
Yes
No
No
No
No sound
from front
speakers
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC3201
and its
peripheral parts.
Is the pin (52) of
IC2001 in the
"L" state?
Is output at pins
(24) and (25) of
IC3201 normal?
Is output at pins
(1) and (7) of
IC3305 normal?
Yes
Yes
No
No
No
Yes
Muting effect is
on. Check the
HP_MUTE line.
Check IC3201
and its
peripheral parts.
Check IC3305
and its
peripheral parts.
No sound
from
headphone
TV sound
failure
Is output at pins
(33) and (34) of
IC3201 normal?
Is output at pins
(1) and (7) of
IC3211 normal?
Check IC3201
and its
peripheral parts.
Check IC3211
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
(14) of Tuner
normal?
Is input at pin
(67) of IC3201.
Check IC3201
and its
peripheral
parts.
Check
Headphone Jack
and connection
cable.
No
Is output at pins
(8) and (12) of
IC3304 normal?
Check IC3304
and its
peripheral parts.
Check front
speaker and
connection
cable.
Yes
Is output at pins
(1) and (7) of
IC3301 normal?
Check IC3301
and its
peripheral parts.
26
LC-15B5E
8
7
10
9
6
5
4
3
2
1
A
B
C
D
E
F
G
H
CHASSIS LAYOUT
CARD LED Unit
R/C, LED Unit
MAIN Unit
27
LC-15B5E
17
16
19
18
15
14
13
12
11
10
ANALOG Unit
INVERTER Unit
OPERATION Unit
28
LC-15B5E
8
7
10
9
6
5
4
3
2
1
A
B
C
D
E
F
G
H
BLOCK DIAGRAM
SIF_OUT
MULTI
SDA/SCL
HEA
TU2201
STANDARD
DACM_L/ R
TV_V
SDA/SCL
SC1_OUT_L/R
SOUND
DACA_L/R
SC2201
SCART
( AV1)
SC_L/R OUT SC1_IN_L/R
SC2_OUT_L
A V1_L/ R
SDA/SCL
V
IDEO CONVERT
V1_V
VIDEO
VIDEO IN
AUDIO IN
AUDIO OUT
VIDEO OUT
V1_V
AV SW
SDA/ SCL
SDA/SCL
IP_AD0~10
R/G/B/FB IN
VOUT
VD
IC8502
I P_DQ0~
J 2201
S
V2_SY/SC
V2V0
SC_R/G/B/FB
MICON
J2202
VIDEO
V2_V
FB SW
R/ G/ B/ FB
SDA/ SCL
TXD/RXD
TXD/RXD
IC1601
CVBS
AUDIO
V2_L/R
VIDEO
IC2003
SDA/SCL
J3701
DC12V
CONVERTER
E
2
PROM
SDA/SCL
SOUND_VCC
+31V
DC/ DC
+ 9V
+35V
+23V
+5V
IC701
- 7V
-12V
R EG IC1701
-8V
SIGVCC
+1.8V
V CC
+3.3V
REG IC2004
REG
+1.5V
+12V
+3.3V
REG IC1702
+4V
INV+B
REG IC1603
REG
REG
REG
SW REG
REG
+ 2.5V
IC702
IC704
IC703
+5V
P4050
KEY
IC2005
IC8803
IC1602
TELETEXT
SRAM 2M
IC3202
IC2001
SDRAM 64M
PROCESSOR
PROCESSOR
AUDIO AMP
TUNER
AUDIO PROCESSOR
IC1611
IC3701
IC1610
REG
SW REG
SW REG
ANA_IN1+
V1_L/R
12S_DA_IN1/OUT
IC8501
REG IC5004
REG IC5409
REG IC8503
IC3203
INPUT
VPC_YIN0~7
DECODER
FLASH 4M
IC1801
R/G/B
ANTENNA
VPC_R/G/B/FB
SYNC SEP
CSYNC
RESET
IC3401
IC8801
IC3210
IC3201
(AV2) INPUT
(AV2) INPUT
(AV2) INPUT
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