Read Sony KDL-55HX827 Service Manual online
KDL-55HX827 21
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:
● G6 (55”)
● G7 (55”)
Note: The G7 Board s a converter circuit dedicated to
providing B+ for the LD (LED Drive) board to control the
groups of LED backlighting
There are 3 distinct sections on the power supply:
Standby Supply: Continuously operational as long as AC power is
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
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: The G6 Board does not contain an integrated converter. It
Converter: The G6 Board does not contain an integrated converter. It
supplies PFC 395VDC to the G7 board where a dedicated converter
generates the B+ for the LD Board.
POWER SUPPLY FOR BACKLIGHT SYSTEM
The 55” models utilize a separate converter circuit G7 due to the
increased current requirements of the larger panel.
3D IR EMITTER
Designated as the HEM2 Board, this board is the internal 3D IR
Emitter to synchronize the 3D shutter glasses.
WIRELESS LAN CARD
The wireless transmit/receive circuits are located on this board to
communicate with a wireless network.
SWITCH UNIT
This board contains the power, channel, and volume up/down and
menu buttons.
CAMERA MODULE
A USB camera is located on the front bezel below the Sony logo.
Special software is located inside IC9000 to use the camera for
power and picture control management. Face recognition software
can determine whether someone is viewing the television. The
number of people, distance from the TV, location from center, and
whether the person(s) are looking at the television provides data to
control the picture brightness and contrast. A lack of face recognition
(no one viewing the television) can also be used to turn off the
backlights, and, eventually turn the TV off for power savings.
IR BOARD
Designated as the HLT2 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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