Sharp LC-20B2EA Service Manual ▷ View online
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LC-20B2EA
I
2
C
I
2
C
ROM
E
2
PROM
ACA_L/R
CM_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(+13V)
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
Q3600~3604
L_ERR
HV1/2/3
MICON
IC2001
IC2001
030
Y/UV
PI
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
Q6700
~6714
~6714
INVVCC(+13V)
DC/AC
TRANS
TRANS
T6700
~6709
~6709
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
+22V
+31V
+5V
+3.3V
+2.5V
OFL1
A0_L/R
OFL
UART
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3
2
1
A
B
C
D
E
F
G
H
LC-20B2EA
OVERALL SCHEMATIC DIAGRAM
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LC-20B2EA
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LC-20B2EA
VOLTAGE MEASUREMENT CONDITION:
1. Voltages at test points are measured at the
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.
color bar signal generator for servicing purpose and
the above voltages are measured with a 20k ohm/
V tester.
WAVEFORM MEASUREMENT CONDI-
TION:
TION:
1. Waveforms at test points are observed at the supply
voltage of AC 120V. Signals are fed by a color bar
signal generator for servicing purpose.
signal generator for servicing purpose.
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=MΩ).
2. All resistors are ± 5%, unless otherwise noted.
(J= ± 5%, F= ± 1%, D= ± 0.5%)
3. All resistors are 1/10W, 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
µF, unless otherwise noted.
(P=pF=
µµF).
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.
SAFETY NOTES:
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACEING PARTS.
2. SEMICONDUCTOR HEAT SINKS SHOULD BE
REGARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.
WHEN THE CHASSIS IS OPERATING.
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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