Sony Bravia KDL-40EX520, Руководство по обслуживанию

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KDL-32EX421/32EX423/32EX520/32EX521/32EX523/40EX520/40EX521/40EX523/46EX520/46EX521/46EX523 23
SECTION 3 - CHASSIS OVERVIEW
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:
● GE2 Board (32”)
● GE3 Board (40”)
● GE3 Board (46”)
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 unregulated 24V source
for the LED power supply circuits.
LED-Backlight Supply: This power supply develops the positive
and negative LED backlight drive voltages. For the 40” models the
positive supply is +109V and the negative supply will be -61V to
-82V.
Switch Unit
This board contains the power, channel, and volume up/down and
menu buttons.
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.
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.
WIFI Board
Only included in the EX423 & EX523 models, this board contains the
Wireless (RF) Network Circuits. The wireless TV circuits are used to
connect to a wireless network.