Power Supply; Power Supply For Backlight System; Ld Board (Led Driver Board); 3D Ir Emitter - Sony KDL-32EX725 Service Manual

POWER SUPPLY

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:
● G10A-Board (32")
● G4B-Board (40")
● G6A-Board (55")
Note:the G8A in the 55" models is the Power Supply Board
for the Panel LED backlight system.
There are 2 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.
POWER SUPPLY FOR BACKLIGHT
SYSTEM
The G8A-Board is the Power Supply Board for the Panel LED
backlighting system (including the LED Driver Board) for the 55"
model only. 390V, 19V, and 12V are applied to the board from the
G6A Board to develop the 24V. The 24V is applied to the LD Driver
board.
KDL-32EX725/40EX725/55EX725
SECTION 3 - CHASSIS OVERVIEW

LD BOARD (LED DRIVER BOARD)

The LED Driver Board is controlled by the T-CON/HFR Board to
perform overall backlight power-on, backlight level, and local dimming
functions. This board takes the 24V from the Power Supply Board
(or G8A Board for the 55" models) and develops the negative and
positive voltages to directly drive the LEDs in the panel assembly.

3D IR EMITTER

Designated as the HEM2 Board, this board is the internal 3D IR
Emitter.

SWITCH UNIT

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

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.

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.
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