FUNAI LT5-M32BB, Service Manual

Page: 29 / 76

7-7
A73F2BLP
Power Supply Block Diagram
HO
T
HO
T
COLD
PO
WER SUPPL
Y CB
A
INVER
TER CB
A
HOT CIRCUIT. BE CAREFUL.
Q602 SWITCHING
CONTR
OL
1
4 3
2
IC603
IC637
T601
CN601
T
O
INVER
TER
BLOCK DIA
GRAM
CN501
4
+3.3V REG.
HO
T
-GND
2
AC
L
1
2 1
P-ON+5V
17,18
+2.5V
10
+4V
12-14
+15V
6
+2.5V
8
AL+3.3V
20
+5V/+12V
-LCD
21,22
+32V
4
F501 T4A H 250V
LINE FIL
TER
L503
A
C501
A
C
CORD
LINE FIL
TER
L502
BRIDGE RECTIFIER
AC
L
HO
T
-GND
D502 - D505
2
16 15 10 14
9
13 12 11
7 6
SHUNT
REG.
Q601
SWITCHING
Q801
AMP+13V P-ON+9V P-ON+5V
P-ON-H
TO SYSTEM CONTROL BLOCK DIAGRAM
AL+3.3V
CN301
CN4501
+9V REG.
Q639,Q640
Q641
Q638
Q637
Q644
JS632
Q635
Q633
Q636
SW +13V
Q632
Q631
Q643
2
3
JS612
Q650,Q651
Q652
SW +5V
Q630
6,7
14
10-12
18 16
4
2,3
20
+32V +15V P-ON+1.5V
IC4505
+1.5V REG.
P-ON+1.8V
IC4506
+1.8V REG.
P-ON+3.3V
DTV-ON-H
AL3.3V +5V/+12V-LCD
IC4504
+3.3V REG.
IC4508
+3.3V REG.
CN4104
DTV+3.3V
6,7
TU+5V
3,4
T
O
D
VB-T MODULE
CBA UNIT
Q4501
SW +5V
Q4502
TO SYSTEM CONTROL BLOCK DIAGRAM
DIGIT
AL MAIN CB
A UNIT
NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal.
CAUTION ! For continued protection against fire hazard, replace only with the same type fuse.
CAUTION ! Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. If Main Fuse (F501) 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.