DOWNLOAD Sony KDL-32BX311 Service Manual ↓ Size: 3.6 MB | Pages: 47 in PDF or view online for FREE

KDL-32BX311  

12

Most symptoms that are correctable by software updates involve 

communications issues with other devices or minor glitches in 

the operation of a specific function. Below is a list of some of the 

symptoms that may be corrected with a software update:

•  Fluctuations in picture brightness

•  Intermittent picture freezing or noise

•  Problems with certain inputs (especially HDMI)

•  Intermittent or distorted audio

•  Erratic remote control operation

•  Unit turns on and off by itself

•  Loss of color

•  Internet connectivity

•  Certain features not working correctly  

(photo or video file viewing)

KDL-32BX311  

13

The primary circuits contained in the AZ2-UK chassis consists of a Main Board (designated as the A Board), Power Supply Board (designated 

as the G13 Board), the IR Board (H Board), the Switch Unit and the LCD Panel Assembly which includes the TCON Board.
NOTE: For connector part number information, refer to 

. For Wire Dressing information, refer to 

.

 

G13 

SWITCH UNIT

H

A

 

KDL-32BX311  

14

overview of the AZ2-UK chassis. Below is a description of the 

components and their functions.

Common to all models utilizing the AZ2-UK chassis, the Main 

Board (A Board) contains most of the video processing circuitry 

along with all audio processing. Control of the television 

is accomplished via a CPU embedded within the MT5388 

processor. Below is a list of the key components located on the 

Main Board.

The tuner is a combination ATSC/NTSC unit. It can receive 

traditional analog NTSC signals via cable or terrestrial along 

with ATSC digital signals via terrestrial (8VSB) or cable (64 or 

256 QAM).

IC U3 performs the majority of the necessary audio and video 

processing on the A board.
Analog Video Input Switch: All analog video sources are 

selected and A/D converted and scaled (if necessary) to 1280 

X 720p 60HZ resolution.
Digital Audio and Video Decoder: The MPEG2 and 

Digital Dolby audio streams are received from the tuner for 

decompression. All video sources which are not native 1280 X 

720p 60HZ are scaled to this resolution. Digital audio content is 

output to the class D amplifier for processing and amplification.

Audio Processing: Analog audio sources are selected and A/D 

converted directly by U3. The audio information is then processed 

digitally. Digital audio from the tuner and HDMI sources is also input 

and  processed.  Class  D  amplifier  U8  provides  the  drive  for  the 

speakers.
HDMI Input and Switching: The customer can select the HDMI1 or 

HDMI2 input. Each HDMI input contains a dedicated EDI NVM (not 

shown) to provide display information data to any device connected 

via the HDMI inputs.
CPU: The CPU internal to the MT5388 processor controls all aspects 

of the television functions. Input from the user along with monitoring 

of critical circuits is also performed by this CPU.
LVDS Transmitter: Integrated into U3 is a Low Voltage Differential 

Signaling (LVDS) transmitter. This circuit converts the 8-bit parallel 

RGB video information into a set of high speed serial lines for noise-

free transmission to the TCON circuits located internally to the LCD 

panel.

KDL-32BX311  

15

The Power Supply Board for this model is designated as the G13 

Board. 
There are 2 distinct sections on the power supply:
Standby Supply: Continuously operational as long as AC power 

is applied, the standby supply generates 3.3VDC for the circuits 

requiring power while the unit is turned off. An unregulated 15-volt 

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 A board, the main switching supply is turned 

on to provide a regulated 12V source, a dedicated un-regulated 15V 

for the audio circuits and an unregulated 24V source for the inverter 

circuit.

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

menu buttons. 

Designated as the H 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.

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.
The TCON performs all the control, timing, charge, and discharge 

functions driving the operation of the LCD Panel.
A new LCD Panel assembly from parts will include the following 

items.
 

LCD Panel 

 

TCON Board 

 

LED Backlight System

The inverter receives the unregulated 24V from the power supply 

board and generates the required high voltage AC to power the 

backlight lamps. A control line to turn on the inverter (backlights on) 

is used in conjunction with a dimmer control to vary the light level of 

the CCFL lamps.
As of the writing of this manual, the inverter is not available as a 

replacement part. The LCD panel assembly must be replaced.

The TCON Board communicates between the LCD Panel and the 

microprocessor on the Main Board. (NOTE: The TCON Board is not 

available as a replacement part for all models.)