Sharp LC-20B4E (serv.man15) Service Manual ▷ View online
25
LC-20B4E
17
16
19
18
15
14
13
12
11
10
V112 V176 V235 V255
AUDIO
IC1905
IC3301
IC304
IC3501
PAVCC(+13V)
VPC0
∼
7
SYNC SIGNAL
010
MICON
IC2001
L_ERR
OUTCON
VCOM
Q1602
Q1604
Q1606
Q1604
Q1606
L_ERR
DC/AC
INVERTER
DRIVE
Q6700
∼
6714
DC/AC
INVERTER
TRANS
T6700
∼
6709
I
2
C
ONVERTER
IC702
TELETEXT
CPU
IC1601
KEY
REMOTE
CONTROL
RECEIVER
G IC1607
G IC1605
+23V
+17V
+2.5V
+3.3V
+5V
EG IC703
−
8V
OLTAGE
−
16V
CVBS
R/G/B
FLASH 4M
IC1611
SRAM 2M
IC1612
OFL REVERSE
Q3606
INVVCC(+13V)
OFL
TEXT R/G/B /FBL
LAMP ERROR
DETECTOR
Q3601
∼
3605
HV1/2/3
CSCOM
P4004
P4001
BACK
LIGHT
LAMP
∼
P6704
P6700
P3601
P3602
R0
∼
7 G0
∼
7 B0
∼
7
PANEL
LCD
SC1202
SC1203
SC1204
V0 V7 V21 V64
AUDIO OUT
SPEAKER
HL/R
FLSP/FRSP
P3301
P3302
HEADPHONE
JACK
J5002
J3901
AUDIO ACTIVE FILTER
L/R_IN
POWER AMP
AO_L/R
CM_L/R
I
2
C
I
2
C
CA_L/R
AUDIO AMP
AUDIO AMP
SC2_OUT_L/R
OM
IC2008
E
2
PROM
RESET
RESET
IC2006
IC2006
CONTROL SIGNAL
YIN0
∼
7
DPS
IC1201
OSD
R/G/B
OFL1
VPC
R/G/B/FB
REV
LEVEL
SHIFT
DAC1CS
MPCLK_5
MPDA_5
IC1101
POWER
GRADATION
26
LC-20B4E
8
7
10
9
6
5
4
3
2
1
A
B
C
D
E
F
G
H
OVERALL WIRING DIAGRAM
27
LC-20B4E
17
16
19
18
15
14
13
12
11
10
28
LC-20B4E
VOLTAGE MEASUREMENT CONDITION:
1. The voltages at test points are measured on
exclusive AC adaptor and the stable supply voltage
of AC 120V. Signals are fed by a color bar signal
generator for servicing purpose and the above
voltages are measured with a 20k ohm/V tester.
of AC 120V. Signals are fed by a color bar signal
generator for servicing purpose and the above
voltages are measured with a 20k ohm/V tester.
INDICATION OF RESISTOR & CAPACI-
TOR:
TOR:
RESISTOR
1. The unit of resistance “
1. The unit of resistance “
Ω
” is omitted.
(K=k
Ω
=1000
Ω
, M=M
Ω
).
2. All resistors are ± 5%, unless otherwise noted.
(J= ± 5%, F= ± 1%, D= ± 0.5%)
3. All resistors are 1/16W, unless otherwise noted.
4. All resistors are Carbon type, unless otherwise
4. All resistors are Carbon type, unless otherwise
noted.
C
: Solid
W
: Cement
S
: Oxide Film
T
: Special
N
: Metal Coating
CAPACITOR
1. All capacitors are
1. All capacitors are
µ
F, unless otherwise noted.
(P=pF=
µµ
F).
2. All capacitors are 50V, unless otherwise noted.
3. All capacitors are Ceramic type, unless otherwise
3. All capacitors are Ceramic type, unless otherwise
noted.
(ML): Mylar
(TA): Tantalum
(PF): Polypro Film
(ST): Styrol
CAUTION:
This circuit diagram is original one, therefore there may be a
slight difference from yours.
slight difference from yours.
IMPORTANT SAFETY NOTICE:
PARTS MARKED WITH “
å
” (
) A R E
IMPORTANT FOR MAINTAINING THE SAFETY OF
THE SET. BE SURE TO REPLACE THESE PARTS
WITH SPECIFIED ONES FOR MAINTAINING THE
SAFETY AND PERFORMANCE OF THE SET.
THE SET. BE SURE TO REPLACE THESE PARTS
WITH SPECIFIED ONES FOR MAINTAINING THE
SAFETY AND PERFORMANCE OF THE SET.
DESCRIPTION OF SCHEMATIC DIAGRAM
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