Sony KDL32EX308 Overall Circuit Descriptions, BAL Board, Audio Processing, HDMI Switch, Overview

Chapter 2 – Overall Circuit Descriptions

Overview

The primary circuits contained in the AZ1L chassis consists of a main circuit board (designated as the BAL board), power supply (GD1 Or G2LE) which varies based on the size of the LCD display, and the LCD panel assembly. The TCON circuit (normally mounted external to the LCD panel) is contained inside the panel assembly. The remaining small boards contain switches, sensors and LED’s.

Overall Circuit Description

Figure 2-1 illustrates an overall block diagram of the KDL22EX308. Figure 2-2 illustrates an overall block diagram for the KDL32EX308. Both chassis designs share most of the same circuits with the power supply and high voltage circuits to supply the lamp voltages being the significant difference. Below is a description of the components and their function for the KDL22EX308.

BAL Board

Common to all models utilizing the AZ1L chassis, the BAL board contains most of the video processing circuitry along with all audio processing. Control of the television is accomplished via CPU IC5000. Below is a list of the key components located on the BAL board.

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 IC4200 for processing and amplification.

Audio Processing

IC4200 selects and processes all audio sources. The audio content is processed digitally, amplified and sent to the speakers.

HDMI Switch

IC2000 functions as a switch for the 4 HDMI inputs. It also serves as an equalizer to match the low impedance of the input jacks to the high impedance of the input to IC9000. IC2000 also contains a shared memory for the EDID information for each HDMI input. When a particular HDMI input is selected, IC9000 loads the proper EDID information into the shared memory.

CPU

IC5000 controls most of the operation of the television. All user inputs are processed here. IC5000 also monitors key voltages and protection circuits to shut the unit down if a problem is detected.

A/V Decoder IC9000

This IC performs several functions including the following:

Tuner: 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).

Analog Video Input Switch: The analog video is A/D converted and scaled (if necessary) to a 1920 X 1080p 60HZ resolution.

LVDS Transmitter

Integrated into IC9000 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 board.

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