Sony 22 klv 22bx320 motherboard

Motherboard Overview

• Chassis ID: AZ2EK (shared with 22CX320, 26BX320, 32BX320, 40CX420) Video/Processing Chipset:

  • BGA‐mounted MT5388 video processor IC

  • DDR2 RAM (typically 32 M × 16 bits)

  • NAND flash memory (~64 MB) Connectors/interfaces:

  • 3× HDMI ports (via TMDS channels)

  • VGA (HD15)

  • Component (Y/Pb/Pr) and composite inputs

  • USB port (for media playback)

  • RF tuner input

  • Audio inputs/outputs and headphone jack

  • LVDS display connector to the LCD panel

• Power control and backlighting:

  • Sync-controlled PWM output to CCFL backlight inverters

  • Conventional inverter circuitry for CCFL tubes

• Resolution & Video Features:

  • Supports WXGA resolution (1366×768) with progressive scan

  • High-definition formats up to 1080p via HDMI/component

• Audio processing:

  • On-board stereo amplifier (2×5 W)

  • Dolby Digital decoding, NICAM/A2 stereo

• On-board interfaces for control:

  • I²C for panel, micon control

  • IR receiver input

  • UART/JTAG likely for factory/service functions

📊 Block Diagram Highlights

According to the AZ2/EK schematic:

• MT5388 is the central BGA processor handling signal decoding, OSD, video scaling, and syncing.

• Memory layout: DDR2 RAM and NAND flash for firmware and system resources.

• Video inputs: TMDS (HDMI), RGB (VGA), YUV and composite—all converging before scaling.

• Sync signals manage the CCFL backlight via PWM lines.

• Multi-channel audio processing flows through onboard amps and line-level outputs

• b.l