HP · laptop motherboard

HP A900 LA-3981P

SchematicBIOS
Board code
LA-3981P
Platform
JBW00
Made by
Compal
Revisions
Rev 0.2
Files
2
Updated

HP A900 LA-3981P is a laptop motherboard designed by Compal and used in the HP A900.

The catalog has 1 schematic and 1 BIOS file for it, posted between 2017 and 2019 across 2 Telegram channels. Each download button opens the original Telegram post.

The files are marked Rev 0.2; 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 platform JBW00.

Compatible models

  • HP A900

Files for HP A900 LA-3981P

Schematics 1 All schematics →

BIOS and firmware 1 All bios and firmware →

Frequently asked questions

Which laptops use the LA-3981P motherboard?
File names in the catalog tie LA-3981P to the HP A900. Laptops sold under one model name can use different boards, so confirm by the code printed on the motherboard.
Which revision of LA-3981P do I have?
Files for this board mention Rev 0.2. 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 LA-3981P 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

Similar boards

Browse more

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