Sharp LC-15B2EA (serv.man6) Service Manual ▷ View online
17
LC-15B2EA
TROUBLE SHOOTING TABLE
(Continued)
No sound (2)
Check all the settings microprocessor
’s adjust process menu.
Yes
No
No
No sound from SCART
No
SCART sound failure
Yes
No
Check IC1901 and its
peripheral parts.
Is output at pins (36) and (37) of
IC1901 normal?
Check IC1902 and its
peripheral parts.
Is output at pins (1) and (7) of
IC1902 normal?
Check their lines and their
peripheral parts.
Is input at pins (53) and (54) of
IC1901 normal?
Check IC1901 and its
peripheral parts.
Is output at pins (27) and (28) of
IC1901 normal?
19
LC-15B2EA
18
12
11
10
9
8
7
6
5
4
3
2
1
A
B
C
D
E
F
G
H
CHASSIS LAYOUT
MAIN PWB
RC/LED PWB
OPERATION PWB
INVERTER PWB
TUNER PWB
21
LC-15B2EA
20
12
11
10
9
8
7
6
5
4
3
2
1
A
B
C
D
E
F
G
H
BLOCK DIAGRAM
ANTENNA
SCART
(AV1)
(AV1)
AUDIO IN
AUDIO OUT
VIDEO OUT
SCL/TXD
SDA/RXD
SC3903
VIDEO IN
R/G/B_ST
INPUT
INPUT
INPUT
SC5001
S
VIDEO
(AV2)
(AV2)
AUDIO
(AV2)
(AV2)
DC12V
J5002
J5001
J3702
INPUT
PAVCC
SIGVCC
INVVCC
PWM
IC3701
DC/DC
CONVERTER
T3701
Q3700
+12V
V1.L/R
I
2
C/UART
V1.SY
TV_V
SC_L/R
TV/AV
SELECTOR
IC402
TUNER
SIF1/2
AI_L/R
I
2
C
I
2
C
I
2
C
I
2
C
E
2
PROM
E
2
PROM
AUDIO AMP
IC1902
ANA_IN1+/2+
SC2_IN_L/R
SC1_OUT_L/R
SC1_IN_L/R
MSP
IC1901
DACA_L/R
DACM_L/R
AUDIO AMP
AUDIO AMP
I
2
C
IC304
SC2_OUT_L/R
IC3500
AUDIO ACTIVE FILTER
IC1903
L/R_IN
AUDIO
POWER AMP
POWER AMP
IC3305
PAVCC(+12V)
FLSP/FRSP
SPEAKER
P3301
P3302
J5003
J3902
J3903
HEADPHONE
JACK
JACK
AUDIO OUT
HL/R
SC1201
SC1202
SC1203
SC1203
LCD
PANEL
PANEL
V0 V7 V17 V21 V32 V64
V112 V176 V235 V255
R0~7 G0~7 B0~7
P3601
BACK
LIGHT
LAMP
LIGHT
LAMP
GRADATION
POWER
POWER
IC1102~1108
IC1110
IC1112~1115
IC1110
IC1112~1115
COMMON DRIVE
VGLCOM
VCOM
CSCOM
IC1109
DAC
IC1101 1111
LAMP ERROR
DETECTOR
DETECTOR
Q3600 3601
L_ERR
HV1/2/3
V2_V
R/G/B_IN
VPC
IC801
V1. SC
V1IN
V2V0
SYNC SEP
IC401
CSYNC
UART
MICON
IC2001
IC2001
IC2030
Y/UV
SYNC SIGNAL
CONTROL SIGNAL
IC2004
LCD
CONTROLLER
IC1201
REV
RESET
IC2002
RESET
OSD R/G/B
R/G/B
OSD/TEXT
SELECTOR
SELECTOR
IC1203
MPCLK
MPDA
DAC2CS
DAC1CS
TEXT R/G/B
L_ERR
OFL REVERSE
Q3650
DC/AC
INVERTER
DRIVE
INVERTER
DRIVE
Q6500
~6504
~6504
INVVCC(+12V)
DC/AC
TRANS
TRANS
T6500
~6503
~6503
KEY
P4001
P4004
REMOTE
CONTROL
RECEIVER
SRAM 2M
IC1603
FLASH 4M
IC1602
TELETEXT
CPU
IC1601
CVBS
R/G/B
I
2
C
TEXT
R/G/B AMP
R/G/B AMP
IC1619 1620
REG
IC1208
REG
IC751
REG
IC703
PAVCC(+12V)
+3.3V
+5V
+5V
+31V
—20V
Q3706
REG
REG
REG
REG
IC752
IC1610
Q3704
IC3702
Q3707
+22V
+31V
+9V
+8V
+5V
+5V
+3.3V
+2.5V
+3.3V
—8V
IC1606
IC1613
0FL1
A0_L/R
OFL
UART
23
LC-15B2EA
22
12
11
10
9
8
7
6
5
4
3
2
1
A
B
C
D
E
F
G
H
OVERALL WIRING DIAGRAM
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