Sony 1-857-593-21 Main Board / A Board for KDL32EX400, KDL40EX400 & KDL46EX400

Sony 1-857-593-21 (185759321) main board / A board, board number 188168312, for Sony KDL32EX400, KDL40EX400, KDL40EX401, KDL46EX400, KDL46EX401, and KDL46EX405 TVs. Match the exact part and board identifiers before ordering a replacement for a diagnosed main-board fault.

Specifications & Board Identifiers

• Brand: Sony
• Product type: Main board / A board
• Part number: 1-857-593-21 (185759321)
• Board number: 188168312
• Compatible models: KDL32EX400, KDL40EX400, KDL40EX401, KDL46EX400, KDL46EX401, KDL46EX405

Common TV Symptoms Fixed

A faulty main board can cause startup problems, unresponsive controls, missing audio, or HDMI/input issues. These symptoms can also have other causes; confirm the main board is faulty before ordering.

Fitment & Ordering Guidelines

Compare the white-sticker part number 1-857-593-21 and PCB/board number 188168312 with your original board. Verify the full TV model suffix, connectors, and any version code on your TV or original board. No specific version code or substitute part is confirmed in this listing; do not choose by screen size or appearance alone.

Disconnect the TV from power before service, use ESD precautions, and avoid touching circuitry or power-supply components. Have a qualified technician perform installation if you are not experienced with TV repair.

KDL32EX400 compatible parts

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