Acer · laptop motherboard

Acer Aspire 3820 09921-3

SchematicBIOS
Board code
09921-3
Platform
Wistron JM31-CP
Made by
Wistron
Revisions
Rev 1.0
Files
5
Updated

Acer Aspire 3820 09921-3 is a laptop motherboard designed by Wistron and used in the Acer Aspire 3820, Acer 3820ZG and Acer Aspire 3820TG.

The catalog has 1 schematic and 4 BIOS files for it, posted between 2021 and 2022 across 3 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.

BIOS notes: some archives also hold EC/KBC firmware. 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 platform Wistron JM31-CP.

Compatible models

  • Acer Aspire 3820
  • Acer 3820ZG
  • Acer Aspire 3820TG

Files for Acer Aspire 3820 09921-3

Schematics 1 All schematics →

BIOS and firmware 4 All bios and firmware →

Frequently asked questions

Which laptops use the 09921-3 motherboard?
File names in the catalog tie 09921-3 to the Acer Aspire 3820, Acer 3820ZG and Acer Aspire 3820TG. Laptops sold under one model name can use different boards, so confirm by the code printed on the motherboard.
Which revision of 09921-3 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 09921-3 BIOS?
Read the original chip with a programmer and save two copies before writing anything. Some archives include EC/KBC firmware, which may need to be written to a separate chip. A dump from another board carries that board's serial number and MAC address, so restore yours from the backup.

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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