Power Supply - Sony KZ-32TS1U Training Manual

The Standby power supply circuit and power ON sequence is simple and easy to figure out by looking at the
simplified Figure 11-1. The only outstanding servicing precaution you must make note of is the over voltage
zener diode on the A board at CN1901/pin 3 in Figure 25-1. If it shorts, it will load down the standby 5Vdc and the
TV will not respond to a power ON command (dead TV set).
Standby Power Supply
The standby power supply is located on the G board with the main power supply. Standby voltage is output when
the TV is plugged into AC. Standby 7Vdc is output CN1605/pin 4 into the bottom A board where it is regulated
down to 5Vdc and passed onto the Main Micro on the M board (via CN1921/pin 16).
G BD.
F1601 6.3A
1
PWR RELAY RY1601
0.2Ω
3
CN1616
MAIN
POWER
SUPPLY
R1654
R1613
+
1
270V TO LAMP
DRIVER BD.
Chapter 25 - Power Supply
SMP-B28
BI-METAL FUSE
LOCATED
UNDER REAR
0.5 Ω
FAN
CN 1614
3 1
R1627
22 1W
STANDBY
7V
POWER
STBY
SUPPLY
7V
Q1603
5V=ON
0V=OFF
R1618
R1617
ERROR REG.
PS1601
PS1602
11V
4.5V
R1655
CN1602
-
3
FIGURE 25-1 - POWER ON BLOCK - KF-60DX100
STBY
5V
H3 BD.
3 7
D1931
IC1905
4
REG.
STBY 5V
CN1605/
POWER
CN1914
CONTROL
5
2 17V
1 33V
CN1604/ CN1926
1
5V
2
CN1606/ CN1909
+15V
2
AUDIO
-15V
6
1 11V
2
CN1613/
3
CN1914
4
1
4.5V
2
CN1603/
3
CN1915
4
54
STBY
LED
POWER
IR
CN4502/
CN1901
5 4
POWER
48
SIRCS
47
STBY LED
45
16
STBY 5V
PWR
21
CN1921/
CN9001
M BD.
A BD.
TUNERS
BOARD LAYOUT
A BD.

25. Power Supply

IC9004
MAIN
MICRO
ON
G
M BB
BC
U
5TVP13 1438 4/11/02