DOWNLOAD Sharp LC-20B2EA Service Manual ↓ Size: 5.66 MB | Pages: 66 in PDF or view online for FREE

Model
LC-20B2EA
Pages
66
Size
5.66 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
lc-20b2ea.pdf
Date
PREV: Sharp LC-20B2E (serv.man13) Service Manual / Technical Bulletin

Sharp LC-20B2EA Service Manual ▷ View online

17
LC-20B2EA
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 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?
TROUBLE SHOOTING TABLE
 (Continued)
18
8
7
10
9
6
5
4
3
2
1
A
B 
C
D
E
F
G
H
LC-20B2EA
R/C RECEIVER Unit
OPERATION Unit
CHASSIS LAYOUT
MAIN Unit
TERMINAL Unit
19
17
16
19
18
15
14
13
12
11
10
LC-20B2EA
INVERTER-A Unit
INVERTER-B Unit
20
8
7
10
9
6
5
4
3
2
1
A
B 
C
D
E
F
G
H
LC-20B2EA
BLOCK DIAGRAM
ANTENNA
SCART
(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)
AUDIO
(AV2)
DC13V 
J5002
J5001
J3702
INPUT 
PAVCC 
DC/DC 
CONVERTER
T3701
Q3700
+13V
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
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
A
I
2
C
SC2_OUT_L/
V2_V
R/G/B_IN
VPC
IC801
V1. SC
V1IN
V2VO
SYNC SEP
IC401
CSYNC
UART
MICON
IC2001
IC2030
Y/
SPI
S
CON
R
L_
REG
IC1208
REG
IC751
+3.3V
+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
SIGVCC  
INVVCC 
REG
IC703
PWM
IC3701
+5V
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