Power Supply Board; Motion Sensor Board; Ir Board; Switch Unit Board - Sony KDL-32EX427 Service Manual

POWER SUPPLY BOARD

There are different Power Supply Boards used in the models in this
manual. The type of board depends on the size of LCD panel. They
are:
● GE2 Board (for 32" models)
● GE3 Board (for 40" and 46" models)
There are 3 distinct sections on the power supply:
Standby Supply: Continuously operational as long as AC power is
applied, the standby supply generates 3.3V for the circuits requiring
power while the unit is turned off. An unregulated 19V line is present
to provide power to the main relay, PFC and main power supply at
turn-on.
Main Supply: Once the power supply receives a power-on command
from the CPU on the Main Board, the main switching supply is turned
on to provide a regulated 12V source and an regulated 24V source
for the LED power supply circuits.
Converter: Generates the B+ for the local dimming (LED Drive
Board) circuits to control the backlighting level.

MOTION SENSOR BOARD

Designated as the HMS3 Board, the Motion Sensor Board contains
the circuits for the Motion Sensor. The Motion Sensor detects when
there is movement in front of the TV. If there is no movement in
front of the TV after a predetermine amount of time the backlight is
turned off (audio present). After an extended period of time the TV is
completely turned off.
KDL-32EX427/32EX527/40EX527/46EX527
SECTION 3 - CHASSIS OVERVIEW

IR BOARD

Designated as the HLR2 Board, the IR Board contains the power,
standby, and timer LED's are located on this board along with the IR
remote receiver and light level sensor.

SWITCH UNIT BOARD

This board contains the power, channel, and volume up/down and
menu buttons.

LCD PANEL ASSEMBLY

The LCD Panel Assembly includes the LCD Panel, TCON Board,
and LED Backlight system.
The LCD Panel contains the actual liquid crystals, color filters, and
polarizers. The liquid crystals are manipulated by the applied voltage
to pass a specific amount of light - from the backlight- depending on
the level of voltage applied.
A new LCD Panel assembly from parts will include the following
items.
1. LCD Panel
2. LED Backlighting Components (varies)

3. TCON Board

TCON BOARD
The TCON Board communicates between the LCD Panel and the
microprocessor on the Main Board. The TCON performs all the
control, timing, charge, and discharge functions driving the operation
of the LCD Panel. (NOTE: The TCON Board is not available as a
replacement part for all models).
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