FUNAI LT850-M26 - SERVICE, Руководство по обслуживанию

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9-6
A0CA0BLP
Power Supply Block Diagram
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 (F701) 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.
HO
T
COLD
PO
WER SUPPL
Y CB
A
PO
WER SW CB
A
HOT CIRCUIT. BE CAREFUL.
1
4 3
2
IC607
T601
CN701
CN601
AC
1
A
C
CORD
16 15 10 14
9
13 11
FEED BA
CK
Q512, Q513
CN406 CN402
CN407
CL900B CN3701
Q504, Q505
SWITCHING
Q509
SW
-7V
Q503, 12.5V
Q516
Q514
Q511
Q508
Q518
SW+5V
Q521,D522
Q517
SW+9V
Q510,D526
Q503,D506
SW+3.3V
SW+3.3V
P-ON-H1
T
O
SYSTEM
CONTR
OL
BLOCK DIA
GRAM
P-ON-H2
PROTECT1
Q520
Q522
P-ON+5V AL+3.3V AL+13V
13,14
10
27-29
6
AL+3.5V AL+5.5V AL+3.3V P-ON+3.3V P-ON+5V P-ON+9V INV+31V
DIGIT
AL MAIN CB
A UNIT
INVER
TER CB
A
LCD-5.5V
8
P-ON+3.3V
13,14
P-ON+3.3V
6,7
LCD+24V
4
LCD+12.5V
2,3
AL+3.3V
10
24,26 19-21
AL+5.5V
24,26
AL+3.5V
19-21
P-ON+5V
27-29
P-ON+9V
6
1-3
INV+31V
9-11
Q405
SW+24V
Q523
12
AC
-I
N
11
AC
-I
N
22
SW701
LINE FIL
TER
L601
BRIDGE RECTIFIER
D609 - D612
Q621
SWITCHING
Q623
LINE FIL
TER
T602
8
IC621
SWITCHING CONTROL
VH
1
ZCD
5
OUT
2
FB
3
IS
6
VCC
Q622
SWITCHING
8 6 7 2 4 3
F701 T4A H 250V
LCD MODULE ASSEMBL
Y