Fan Control - Kf-60Dx100 - Sony KZ-32TS1U Training Manual

Chapter 26 - Fan Control - KF-60DX100
This Sony Grand Wega LCD Projection TV has two fans that start when the TV is turned ON and stop five
seconds after the TV is turned OFF. Fan 2 is located at the rear and is visible as soon as the rear panel is
removed. It cools the lamp block/assembly underneath it. Fan 1 is hidden under the LCD Optical assembly /
light box.
Both fans contain Hall effect devices and circuitry that monitor fan rotation. If the Main Micro (M board) detects
no rotation from either fan, the TV shuts down within five seconds.
In addition to this protection, if the temperature of the lamp assembly reaches a critical level, the TV will also turn
OFF. A replaceable Bi-Metal fuse located under fan 2 (lamp cooling) will open if the lamp assembly gets excessively
hot.
Main
Micro
M Board
Fan Drive
Refer to Figure 26-1. The power supply board's 11Vdc (CN1613/pin 1-4) source powers both fans. In-between
the power supply and fan is the A board. On the A board is regulator IC1908 that provides switched 5Vdc to the
LCD fan 1 and IC1909 to provide switched 9Vdc to the Lamp fan 2.
LCD Fan 1 = ON
A Board Connector
CN1920/pin 20
CN1920/pin 21
CN1920/pin 22
CN1914/pin 1, 2, 3, or 4.
Five voltages from CN1920 are input the A Board, along with the supply voltage at CN1914 (11Vdc). When these
voltages are input, the A Board will output 5V and 9V to power their respective fans.
Power Supply G Board
Sw
Regulator IC1908
Regulator IC1909
FIGURE 26-1 - FAN CONTROL BLOCK
Table 26-1 Fan Control
Voltage
0Vdc
0Vdc
5Vdc
11Vdc (supply)
11Vdc
A Board
Lamp Fan 2 = ON
A Board Connector
CN1920/pin 18
CN1920/pin 19
CN1920/pin 22
CN1914/pin 1, 2, 3, or 4.
56

26. Fan Control - KF-60DX100

5V
LCD Fan 1
9V
Lamp Fan 2
4/16/02
Voltage
0Vdc
5Vdc
5Vdc
11Vdc (supply)