Sylvania 6620LDG, Service Manual

Page: 34 / 74

9-5
Power Supply Block Diagram
L2650BLP
4A/125V
F601 4A/125V
LINE FIL
TER
L601
A
C
601
A
C
CORD
BRIDGE RECTIFIER
D605 - D608
HO
T
COLD
T601
12 15 13 16 14 11
4
4 3
1 2
IC601 ERR
O
R
V
O
LT
A
GE DET
Q601
Q603 SWITCHING
CONTR
O
L
SWITCHING
MAIN CB
A
2 6 7
P
ANEL+25V
26
P
ANEL-6V
21
P
ANEL+3.3V
1
P
ANEL+3.3V
23
AL+13V
P-ON-H P-25V
-ON
BA
CKLIGHT
-ADJ
Q632
Q504
Q501
SW+25V
Q503
+10.8V REG.
Q506
SW-6V
HOT CIRCUIT. BE CAREFUL.
CN1207
P
ANEL+3.3V
24
P
ANEL+10.8V
4
P
ANEL+10.8V
5
Q505
Q502
+1.5V D+3.3V P-ON-5V AL+3.3V
10
9
INV+22V +40V
TP401
INV+22V
T
O
SYSTEM
CONTR
OL
BLOCK DIA
GRAM
T
O
LCD BA
CKLIGHT
BLOCK DIA
GRAM
D647
SHUNT REG.
IC605
+5V REG.
IC606
+5V REG.
Q402
Q401
Q403
IC603
+1.5V REG.
IC602
+3.3V REG.
VT+33V
D505
SHUNT REG.
TO LCD MODULE
EV+3.3V
T
O
SYSTEM CONTR
OL
BLOCK DIA
GRAM
D
VD MAIN CB
A UNIT
EV+1.2V
44 EV+1.2V
55 EV+3.3V
66 EV+3.3V
77
CN1651
CN401
EV+1.2V EV+3.3V D
VD-ON+3.3V
D
V
D-ON+5V
EV+9V EV+3.3V
EV+3.3V
88 D
V
D-ON+3.3V
99
D
VD-ON+5V
10
10
EV+9V
11
11
EV+9V
12
12
EV+3.3V
11
D
V
D-MAIN-PO
WER
IC1652
+1.2V REG.
Q1656
Q1657
Q1655
Q1654
Q1653
Q1651
Q1652
PWRCON
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.
For continued protection against risk of fire, replace only with same type 4 A, 125V fuse.
CAUTION ! : ATTENTION :
Utiliser un fusible de rechange de m
ê
me type de 4A, 125V.
4A/125V
NOTE: The voltage for parts in hot circuit is measured using hot GND as a common terminal.