Dell · laptop motherboard

Dell Precision 5550 LA-J191P

SchematicBIOS
Board code
LA-J191P
Platform
FDC55
Made by
Compal
Revisions
Rev 1.0, Rev 2.0
Files
5
Updated

Dell Precision 5550 LA-J191P is a laptop motherboard designed by Compal and used in the Dell Precision 5550 and Dell XPS 7390.

The catalog has 1 schematic and 4 BIOS files for it, posted between 2022 and 2024 across 2 Telegram channels. Each download button opens the original Telegram post.

File names mention 2 board revisions (Rev 1.0 and Rev 2.0). Check the revision printed on your PCB before relying on a boardview or flashing a BIOS dump — How to Open .FZ Boardview Files explains why it matters.

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: file names mention 32 MB chip sizes; versions with a cleaned ME region are included. 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 FDC55.

Compatible models

Files for Dell Precision 5550 LA-J191P

Schematics 1 All schematics →

BIOS and firmware 4 All bios and firmware →

Notes from the source posts

  • 2020-01-31

Frequently asked questions

Which laptops use the LA-J191P motherboard?
File names in the catalog tie LA-J191P to the Dell Precision 5550 and Dell XPS 7390. Laptops sold under one model name can use different boards, so confirm by the code printed on the motherboard.
Which revision of LA-J191P do I have?
Files for this board mention Rev 1.0 and Rev 2.0. 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 LA-J191P BIOS?
Read the original chip with a programmer and save two copies before writing anything. File names for this board mention 32 MB images; the dump size must match your 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