7-6
Power Supply-1 Block Diagram
A81H1BLP1
F500
8A/250V
LINE
FIL
TER
L501,L502
A
C600
A
C
CORD
BRIDGE
RECTIFIER
CONTINUE
PO
WER SUPPL
Y
-2
BLOCK DIA
GRAM
BRIDGE
RECTIFIER
D500
D517 - D520
HO
T
HO
T
COLD
COLD
IC500
IC702
(FEEDBA
CK)
IC600
(FEEDBA
CK)
IC503
(FEEDBA
CK)
IC502
(FEEDBA
CK)
IC703
(ISOLA
T
OR)
(PFC)
IC701
(HIGH-V
O
LT
A
G
E
RESONANT CONTR
OL
)
HIGH-
VO
LT
A
G
E
RESONANT
CONTR
OL
INVER
TER PO
WER CB
A
PO
WER SUPPL
Y CB
A
4
3
1
2
4
3
1
2
4
3
1
2
4
3
1
2
IC761
+13V
SHUNT
REG.
+345V
1
CN500
HO
T
-GND
2
1
2
INV+24V
1-5
CN751
GND
6-10
BA
CKLIGHT
-SW
12
BA
CKLIGHT
-ADJ
13
AL+15V
1
CN501
CN701
CN702
HO
T
-GND
2
2
1
T601
T701
LCD MODULE
16
9
12
13
14
2
4
7
6
8
15
11
10
Q500,
Q501
Q502
Q508
Q503
POWER
FACOTOR
CORRECTION
VCC
(AL+15V)
Q504
Q505
Q506
SW
DRIVE
Q600
Q601
SW
SW CTL
Q602
+15V REG.
3
5
1
2
Q704
Q703
SW
VCC
O
VER
CURRRENT
PR
O
TECT
OR
Q701
Q762
Q761
SW
Q702
SW
6
4
16
11
14
13
11
15
6
5
12
P-ON-H2
T
O
SYSTEM
CONTR
OL
BLOCK
DIA
GRAM
BA
CKLIGHT
-SW
BA
CKLIGHT
-ADJ
8A/250V
Q509
1
2
4
3
INV+24V
1-5
CN752
CAUTION !
Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.
If Main Fuse (F500) is blown , check to see that all components in the power supply
circuit are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.
For continued protection against risk of fire,
replace only with same type 8A, 250V fuse.
CAUTION ! :
ATTENTION :
Utiliser un fusible de rechange de m
ê
me type de 8A, 250V.
8A 250V
NOTE:
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.
Содержание LC420SS8
Страница 1: ...SERVICE MANUAL 42 COLOR LCD TELEVISION LC420SS8 ...
Страница 16: ...4 4 A81H1DC 9 Power Supply CBA 10 PCB Holder S 12 S 14 S 13 8 Jack CBA S 13 S 13 S 14 S 14 S 14 Fig D3 ...
Страница 37: ...8 8 A81H1SCF Function Schematic Diagram ...
Страница 38: ...8 9 A81H1SCIR IR Sensor Junction Schematic Diagram ...
Страница 42: ...8 13 Digital Main 4 9 Schematic Diagram A81H1SCD4 ...
Страница 43: ...8 14 Digital Main 5 9 Schematic Diagram A81H1SCD5 ...
Страница 50: ...8 21 BA81H0F01022 1 Jack CBA Top View ...
Страница 54: ...8 25 Function CBA Top View Function CBA Bottom View BA81H0F01012 4 Junction CBA Top Bottom View BA81H0F01012 2 ...