Sharp LC-20C2E (serv.man2) Service Manual ▷ View online
13
LC-13B2H/M
LC-15B2H/M
LC-20B2H/M
LC-15B2H/M
LC-20B2H/M
3-8. Inverter circuit
13V (12V for 13/15B2U) inputted from the AC adapter passes through the DC/AC converter circuit composed of
a transformer and a LC oscillation circuit to supply stable AC power to the lamp.
a transformer and a LC oscillation circuit to supply stable AC power to the lamp.
DC12V
(13/15B2H/M)
Buffer
Q5701
Q5702
Q5703
Q5702
Q5703
Transformer
T5701
T5702
T5702
High voltage
power supply
(lamp power supply)
DC13V
(20B2H/M)
Buffer
Q6751
Q6752
Q6755
Q6752
Q6755
Transformer
T6751
T6752
T6753
T6752
T6753
Transformer
T6551
T6552
T6553
T6552
T6553
Buffer
Q6551
Q6552
Q6555
Q6552
Q6555
High voltage
power supply
(lamp power supply)
High voltage
power supply
(lamp power supply)
Fig. 3-10. Inverter circuit (20B2H/M)
Fig. 3-11. Inverter circuit (13/15B2H/M)
3-9. Lamp error detection circuit
For safety, this LCD color television has a function to turn OFF the power automatically when an abnormal
condition occurs in the lamp or lamp circuit (lamp error detection). If an abnormal condition should occur in the
lamp or lamp circuit, D3600-03 and Q3600-02 will operate to send a lamp error signal to IC2001 (pin (42)),
resulting in the following:
condition occurs in the lamp or lamp circuit (lamp error detection). If an abnormal condition should occur in the
lamp or lamp circuit, D3600-03 and Q3600-02 will operate to send a lamp error signal to IC2001 (pin (42)),
resulting in the following:
1
About 5 seconds after the power of the television main body is turned ON, the power is turned OFF. (The
power LED located on the front of the television changes from green to red.)
power LED located on the front of the television changes from green to red.)
2
If
1
is repeated five times successively, it becomes impossible to turn ON the power. (The power LED
remains red.)
~
For measures to be taken, refer to the service manual.
Fig. 3-12. Lamp error circuit
LAMP
D3600
D3601
D3601
D3602
D3603
D3603
Q3600
Q3601
Q3602
Q3601
Q3602
L.ERR
IC2001
14
LC-13B2H/M
LC-15B2H/M
LC-20B2H/M
LC-15B2H/M
LC-20B2H/M
4. TERMINAL NAME AND SHORT DESCRIPTION OF ICs
4-1. Description of video signal sync separation circuit IC (IC401) VHIBA7046F/-1Y terminals
No.
Terminal name
Description
1
1
Horizontal oscillation resistance terminal
2
2
HD output terminal
3
3
SYNC output terminal
4
4
VD output terminal
5
5
GND terminal
6
6
Video input terminal
7
7
Power supply terminal
8
8
Phase comparator output terminal
4-2. Description of 3-terminal regulator IC (IC701) VHIAN8005M/-1Y terminals
No.
Terminal name
Description
1
OUT
Output terminal
2
COM
Grounding terminal
3
IN
Input terminal
4-3. Description of 3-terminal regulator IC (IC702) VHIBA033FP/-1Y terminals
No.
Terminal name
Description
1
Vcc
Input terminal
2
GND
Grounding terminal
3
OUT
Output terminal
4-4. Description of D/A converter IC (IC1101) VHIMB8346BV-1Y terminals
No.
Terminal name
Description
1
Vss
GND terminal
2
AO3
D/A output terminal
3
AO4
D/A output terminal
4
AO5
D/A output terminal
5
AO6
D/A output terminal
6
AO7
D/A output terminal
7
AO8
D/A output terminal
8
+BADJ
D/A output terminal
9
AO10
D/A output terminal
10
Vdd
Power supply terminal
11
Vcc
Power supply terminal
12
AO11
D/A output terminal
13
AO12
D/A output terminal
14
DO
Data output terminal
15
DAICS
Load signal input terminal
16
CK
Shift clock input terminal
17
DI
Data input terminal
18
AO1
D/A output terminal
19
AO2
D/A output terminal
20
GND
GND terminal
4-5. Description of operational amplifier IC (IC1102, 03, 04) VHINJM4565V-1Y terminals
No.
Terminal name
Description
1
A OUTPUT
Output terminal
2
A –INPUT
Input terminal
3
A +INPUT
Input terminal
4
V–
Power supply terminal
5
B +INPUT
Input terminal
6
B –INPUT
Input terminal
7
B OUTPUT
Output terminal
8
V+
Power supply terminal
15
LC-13B2H/M
LC-15B2H/M
LC-20B2H/M
LC-15B2H/M
LC-20B2H/M
4-6. Description of dual operational amplifier IC (IC1106, 07, 08) VHINJM4580V-1Y terminals
No.
Terminal name
Description
1
A OUTPUT
Output terminal
2
A –INPUT
Input terminal
3
A +INPUT
Input terminal
4
V–
Power supply terminal
5
B +INPUT
Input terminal
6
B –INPUT
Input terminal
7
B OUTPUT
Output terminal
8
V+
Power supply terminal
4-7. Description of dual operational amplifier IC (IC1109) VHINJM353M/-1Y terminals
No.
Terminal name
Description
1
A OUTPUT
Output terminal
2
A –INPUT
Input terminal
3
A +INPUT
Input terminal
4
V–
Power supply terminal
5
B +INPUT
Input terminal
6
B –INPUT
Input terminal
7
B OUTPUT
Output terminal
8
V+
Power supply terminal
4-8. Description of line buffer IC (IC1202) VHIPD485505-2Y terminals
No.
Terminal name
Description
1
Dout0
Data output
2
Dout1
Data output
3
Dout2
Data output
4
Dout3
Data output
5
RE
Read enable input
6
RSTR
Reset read input
7
GND
Ground
8
RCK
Read clock input
9
Dout4
Data output
10
Dout5
Data output
11
Dout6
Data output
12
Dout7
Data output
13
Din7
Data input
14
Din6
Data input
15
Din5
Data input
16
Din4
Data input
17
WCK
Write clock input
18
Vcc
Power supply voltage
19
RSTW
Reset write input
20
WE
Write enable input
21
Din3
Data input
22
Din2
Data input
23
Din1
Data input
24
Din0
Data input
4-9. Description of multiplexer IC (IC1204) VHITC4024BF-1Y terminals
No.
Terminal name
Description
1
CLOCK
Clock input
2
RESET
Reset input (Active High)
3
Q7
Input terminal
4
Q6
Input terminal
5
Q5
Input terminal
6
Q4
Input terminal
16
LC-13B2H/M
LC-15B2H/M
LC-20B2H/M
LC-15B2H/M
LC-20B2H/M
7
Vss
GND terminal
8
NC
Not connected
9
Q3
Input terminal
10
NC
Not connected
11
Q2
Input terminal
12
Q1
Input terminal
13
NC
Not connected
14
Vdd
Power supply terminal
4-10. Description of multiplexer IC (IC1205) VHITC4052BF1EY terminals
No.
Terminal name
Description
1
0Y
Output terminal
2
2Y
Output terminal
3
Y-COM
Output terminal
4
3Y
Output terminal
5
1Y
Output terminal
6
INH
Input terminal
7
Vee
GND terminal
8
Vss
GND terminal
9
B
Input terminal
10
A
Input terminal
11
3X
Output terminal
12
0X
Output terminal
13
X-COM
Output terminal
14
1X
Output terminal
15
2X
Output terminal
16
Vdd
Power supply terminal
4-11. Description of dual bilateral switch IC (IC2003) VHITC4W66F/-1Y terminals
No.
Terminal name
Description
1
IN/OUT1
IN/OUT terminal 1
2
OUT/IN1
OUT/IN terminal 1
3
CONT2
Control input terminal 2
4
Vss
GND terminal
5
IN/OUT2
IN/OUT terminal 2
6
OUT/IN2
OUT/IN terminal 2
7
CONT1
Control input terminal 1
8
Vdd
Power supply terminal
4-12. Description of EEPROM IC (IC2004) VHIBR2416E2-1Y terminals
No.
Terminal name
Description
1
A0
Input terminal
2
A1
Input terminal
3
A2
Input terminal
4
GND
GND terminal
5
SDA
Serial data input/output
6
SCL
Serial clock input
7
WP
Write protect terminal
8
Vcc
Power supply terminal
4-13. Description of audio amplifier IC (IC3305) VHILA4635A+-1S terminals
No.
Terminal name
Description
1
DC
Ripple Filter
2
IN1
Input terminal 1
3
PREGND
GND terminal
4
IN2
Input terminal 2
5
STBY
Standby apploed voltage
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