Sharp LC-22DS240K Service Manual ▷ View online
25
LC-22DV240
LC-22DS240
LC-22DS240
The DC voltages required at various parts of the chassis and panel are provided by a
main power supply unit. MB62 chassis can operate with IPS60, IPS16, IPS17, PW26,
PW27 as main power supply and also with 12V adaptor.
main power supply unit. MB62 chassis can operate with IPS60, IPS16, IPS17, PW26,
PW27 as main power supply and also with 12V adaptor.
CN706 is used for IPS60, IPS16 and IPS17 and CN1 is used for PW26 and PW27.
4. POWER STAGE
3V3_VCC
3V3_STBY
S8
S7
VDD_AUDIO_PWR
VDD_AUDIO_PWR
CN706
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
3V3_VCC
DIMMING
BACKLIGHT_ON/OFF
5V_STBY
5V_VCC
STBY_ON/OFF
5V_VCC
C7
16V
22uF
12V_VCC/STBY
12V_VCC/STBY
12V_VCC/STBY
C6
16V
22uF
POWER SOCKET
JK9 is used for the adapter option and also CN705 inverter socket or DB32 chassis with
CN706 is used to supply backlight.
CN706 is used to supply backlight.
The power supplies generate 18V, 12V, 5V, 3,3V and 12V, 5V, stand by mode DC
voltages. Power stage which is on-chassis generates 5V, 3V3 stand by voltage and 12V,
8V, 5V, 3V3, 2.5V, 1,8V and 1,2V supplies for other different parts of the chassis. Chassis
block diagram is indicated below.
voltages. Power stage which is on-chassis generates 5V, 3V3 stand by voltage and 12V,
8V, 5V, 3V3, 2.5V, 1,8V and 1,2V supplies for other different parts of the chassis. Chassis
block diagram is indicated below.
26
LC-22DV240
LC-22DS240
LC-22DS240
DC
DC
DC
DC
DC
DC
DC
DC
LDO
12V_STBY
12V_VCC
1V2_VCC
5V_STBY
5V_VCC
3V3_STBY
3V3_VCC
2V5_VCC
1V8_VCC
SW1
LDO
DC-DC4
SW2
SW3
DC-DC2
DC-DC1
DC-DC3
POWER BLOCK DIAGRAM
LDO1
LDO2
3V3_TUN
The blocks on power block diagram is using dependent to main supply. For PW26 and
PW27 just common blocks are enough for proper operation.
PW27 just common blocks are enough for proper operation.
For IPS16, IPS17, IPS60 below blocks must work properly.
27
LC-22DV240
LC-22DS240
LC-22DS240
Short CCT Protection Circuit
Short circuit protection is necessary for protecting chassis and main IC against damages
when any Vcc supply shorts to ground. Protect pin should be logic high while normal
operation. When there is a short circuit protect pin shold be logic low. After any short
detection, SW forces LEDs on LED card to blink.
when any Vcc supply shorts to ground. Protect pin should be logic high while normal
operation. When there is a short circuit protect pin shold be logic low. After any short
detection, SW forces LEDs on LED card to blink.
For adopter case also below are necessary
60R
F6
1
2
F7
60R
1
2
5V_VCC
60R
F9
1
2
12V_VCC
12V_STBY
R1972
10k
1
2
NV
TP243
1
22uF
C1092
16V
C1102
16V
22uF
Q198
FDC604P
1
34
5
6
2
C1037
16V
100nF
22uF
16V
C1091
12V_STBY
5V_STBY
L118
15uH
1
2
R1737
33k
R1709
3k9
1
2
5n6F
50V
C1130
1
2
16V
10nF
C1112
1
2
D197
SS33
12
MP1583
U174
5
6
7
8
4
3
2
1
BS
IN
SW
GND
SS
EN
COMP
FB
10k
R1690
1
2
60R
F287
1
2
100nF
16V
C1038
16V
C1103
22uF
MOSFET_CONTROL
R1698
10k
1
2
5V_VCC
1k
R1728
5V_STBY
Q184
BC848B
BC848B
1
2
3
R1722
47R
1
2
C1047
220nF
25V
12
33k
R1729
1
2
APTER
0R
W/ADAPTOR
DC/DC1
SW2
100R
R1973
Q211
BC848B
1
2
3
R1636
10k
1
2
10k
R1635
1
2
3V3_TUNER
12V_VCC
3V3_VCC
5V_VCC
R1750
22k
VDD_AUDIO_PWR
10k
R1631
1
2
BAW56
D184
12
3
10k
R1639
12
10k
R1638
1
2
Q178
BC848B
1
2
3
Q180
BC858B
1
2
3
3V3_STBY
R1649
33k
1
2
D185
BAW56
12
3
D186
BAW56
12
3
100nF
C971
10V
1
2
PROTECT
TP202
1
U7
LM809
1
3
2
RST
VCC
GND
3V3_STBY
12V_STBY
R20
10k
1
2
R40
20k
10k
R21
R1727
33k
1
2
SHORT CCT PROTECTION
ADAPTOR OVER VOLTAGE PROTECTION
28
LC-22DV240
LC-22DS240
LC-22DS240
4.1. Power Management
---MB62 Power Management with Adaptor---
---MB62 Power Management with PW25/ PW26---
Click on the first or last page to see other LC-22DS240K service manuals if exist.