FUNAI LT5-S20BB, Service Manual

Page: 25 / 56

7-5
A7344BLP
Power Supply Block Diagram
LINE FIL
TER
L601
AC
6
0
1
A
C
CORD
BRIDGE RECTIFIER
D611,D613, D614,D616
HO
T
COLD
T601
19 15 13 14 18 12
3
4 3
1 2
MAIN CB
A
HOT CIRCUIT. BE CAREFUL.
5 7 8
16 17
IC601
ERR
OR
VO
LT
A
G
E
DET
F601 T4A H 250V
Q600
Q601
+35V
P-ON+5V D
VB+3.3V
P-ON+1.5V AL+12V P-ON+9V AL+3.3V(D) P-ON+3.3V TUNER+5V
P-25V
-ON
P-ON-H PR
O
TECT
-1
PR
O
TECT
-2
RESET
AL+33V
INV+21V
CN101A
T
O
SYSTEM
CONTR
OL
BLOCK DIA
GRAM
T
O
LCD
BA
CKLIGHT
BLOCK DIA
GRAM
T
O
LCD MAIN
CBA UNIT (CN101B)
Q907
Q908
Q913
Q909
IC900
+5V REG.
Q902,D920
+3.3V REG.
Q901,D916
+3.8V REG.
Q920
RESET
15
P
ANEL+25V
16
P
ANEL-6V
17
P
A
NEL+10.8V
CN102A
T
O
LCD MAIN
CBA UNIT (CN102B)
5,6
P
ANEL+3.3V
7
AL+3.3V(D)
9
P-ON+5V
11
AL+3.3V(A)
Q915,D943
+1.5V REG.
Q903,Q905
SW+3.3V
Q910,D936
SW+10.8V
Q906,D926
+9V REG.
Q914
Q904
SW+3.3V
Q911,Q912
SW+25V
Q900
Q302,D300
SW+5V
IC301
+3.3V REG.
1
2
4
Q301
Q303
Q300
CN54
3,4
D
VB+5V
6,7
D
VB+3.3V
T
O
D
V
B-T MODULE
CBA UNIT
CAUTION ! Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. If Main Fuse (F601) 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.
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.