57
26. Fan Control - KF-60DX100
IC1908
REG
IC1909
REG
IC9502
FAN/
LAMP
CONTROL
IC9004
MAIN
MICRO
FAN 1
CONTROL
FAN 2
5V=ON
0V=OFF
S
DATA
S
CLK
HALL
DEVICES
BI-METAL
FUSE
UNDER
FAN 2
FAN 1
FAN 2
BLK
BLU
RED
5V
0V
YEL
WHITE
RED
IC1905
Q1905
5V
11V
POWER
SUPPLY
7V
M BD.
*
*
HALL DEVICES
DETECT FAN
ROTATION
5V
H
L
0V
0V
0V
H
L
LAMP
LED
D1901
D1902
FAN 2 PWR 9V
FAN 1
PWR 5V
0V
0V
0V
0V
CN1605/ CN1914
STBY
5V
5V
5V=SHUTDOWN
0V=NORMAL
STBY
5V
CN1901
CN5402
CN1613/
CN1914
STANDBY LED
Q4508
CN1908
CN9001/
CN1921
CN9501/
CN1920
1.2V
7V
3
1
1
2
1
2
2
3
4
1
2
3
4
5
4
4
5
1
CN1614
21
16
26
20
21
18
19
23
45
6
5
7
9
8
10
7
3
7
3
22
FIGURE 26-2 - FAN CONTROL - KF-60DX100
11V
CN1604/
CN1926
9V
7TVP13 1442
4/16/02
H3 BD.
A BD.
PWR SUPPLY BD.
RY
1601
5V
FAN 1
FAN 2
BI-METAL
PS
BD.
M BD.
CN1908
TV REAR
A BD.
FAN/BOARD LOCATION
7V
Fan Rotation Detection
When drive voltage to the fan is present, the fan rotation detector output will ground out the 5Vdc input at
CN1908/pins 8 & 10. This ground (0Vdc) keeps the Main Micro from turning OFF the TV.
If either fan stops rotating, CN1908/pins 8 or 10 will rise to 5Vdc. This 5Vdc is detected by Min Micro IC9004
(CN9020/pin 45 *) and IC9004 shuts off the TV in five seconds.
* CN9020 can be accessed from under the A board. Tilt the TV board assembly up and locate the marked pin.