Sony · laptop motherboard

Sony M851 MBX-204

SchematicBIOS
Board code
MBX-204
Made by
Foxconn
Revisions
Rev 1.0
Files
6
Updated

Sony M851 MBX-204 is a laptop motherboard designed by Foxconn and used in the Sony M851 and Sony M850.

The catalog has 1 schematic and 5 BIOS files for it, posted between 2017 and 2022 across 4 Telegram channels. Each download button opens the original Telegram post.

The files are marked Rev 1.0; other revisions of the same board can differ in parts and layout.

The schematic is a PDF; the first pages usually hold the block diagram and the power sequence. New to schematics? Start with How to Use a Schematic and a Boardview Together.

Read and save the original chip contents before you write anything to it — Keeping the Windows Product Key (MSDM) When Reflashing a BIOS.

Also listed under codes MBX-217.

Compatible models

Files for Sony M851 MBX-204

Schematics 1 All schematics →

BIOS and firmware 5 All bios and firmware →

Frequently asked questions

Which laptops use the MBX-204 motherboard?
File names in the catalog tie MBX-204 to the Sony M851 and Sony M850. Laptops sold under one model name can use different boards, so confirm by the code printed on the motherboard.
Which revision of MBX-204 do I have?
Files for this board mention Rev 1.0. The revision is printed on the PCB silkscreen, usually next to the board code. Pick files with the same revision when you can; if yours is not listed, the closest revision is usually fine for the schematic but check part positions in the boardview carefully.
What should I check before flashing the MBX-204 BIOS?
Read the original chip with a programmer and save two copies before writing anything. A dump from another board carries that board's serial number and MAC address, so restore yours from the backup.

Guides for this board

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Files are hosted on Telegram by third parties; ExcitingSpas.com only links to public posts. Check that a file matches your board before using it. Disclaimer · Report a file