How to Open .PCB and .CAD Boardview Files

.PCB and .CAD are the two most ambiguous extensions in repair archives. Both are generic words used by many unrelated programs, so a file with either extension might be a boardview your viewer opens in a second — or a full design file that needs professional CAD software. Telling them apart quickly saves a lot of frustration.

Why these extensions are confusing

Most boardview formats have extensions that only boardview tools use. .PCB and .CAD are different: dozens of programs use them for their own files. In repair archives you will find at least these kinds:

In our catalog .CAD is the second most common boardview format, so it is worth learning to handle. Browse the .CAD boardview list to see which boards have them.

Step 1: identify the file

Before trying viewers, spend thirty seconds identifying what you have:

1. Check the size. Boardviews for a laptop or desktop board are typically from a few hundred kilobytes to a few megabytes. Design files are often much larger, and archives with design files usually contain many other files too.
2. Open it in a text editor. Text-based CAD boardviews show readable section headers and long lists of part names, pin numbers and net names in plain text. If you see readable words such as COMPONENT, PIN, NET or familiar designators like PU301, it is very likely a text boardview.
3. Look at the archive. A folder with .pcb, .sch, library files and project files is a design project. A single .cad or .pcb next to a schematic PDF is usually a boardview.
4. Read the first line. Many formats name the tool or format version in the header.

Step 2: open the common variants

.CAD

1. Try FlexBV first. It opens the common text-based CAD boardviews used for laptop and desktop boards.
2. If you only have OpenBoardView, try it as well — some CAD variants open there.
3. If neither works and the file is text, it may be a GenCAD-style export. Some viewers import GenCAD; CAD conversion utilities also exist.

.PCB

1. Try FlexBV, which supports several boardview variants that use this extension.
2. If it does not open, check whether it is a native design file (Step 1). Design files need the original design software, which is usually expensive and not worth acquiring for repair.
3. Look for another format of the same board — .BDV, .BRD, .TVW — on the board page.

Step 3: when nothing opens it

When a file refuses to open everywhere:

• Download it again. Archive corruption is more common than exotic formats.
• Look for other formats of the same board. Many boards in the catalog have two or three boardview formats.
• Fall back to the schematic and the board. You can work without a boardview, locating parts by silkscreen and landmarks. It is slower but entirely workable.
• Read the general guide. Boardview File Won't Open: Common Errors and Fixes lists every common cause.

Using a text CAD file without a viewer

A text-based CAD boardview is readable even without a viewer, and that can help in a pinch:

1. Open it in a good text editor.
2. Search for a reference designator to find its coordinates and pins.
3. Search for a net name to list every pin connected to it.

You will not get a picture of the board, but you can answer "which parts are on +3VALW?" or "which net is pin 5 of PU12 on?" — often all you need to decide what to measure.

Matching the file to your board

The same rules apply as for any boardview:

• compare the revision in the file or archive name with the PCB;
• compare the outline and the position of large parts with your board;
• check a few designators you can read on the silkscreen against the file.

Desktop boards from MSI, Gigabyte and ASRock often appear as CAD or PCB files. Their revision is printed on the board near the model name, and VRM layouts can differ between revisions — check before trusting positions. See How to Match a Boardview to Your Board Revision.

Tips for working with CAD boardviews

• Expect plain outlines. Text CAD exports often show simple rectangles for parts. Use pin positions and the schematic to orient yourself.
• Check for both sides. Some exports put top and bottom parts in separate sections; make sure your viewer shows both.
• Expect missing values. Few CAD exports include values. The schematic remains your source for those.
• Use net search heavily. Net names in CAD exports usually match the schematic, which makes the boardview a good index even when the drawing is basic.

Example: a desktop board with only a CAD file

A desktop motherboard arrives with a dead CPU power section, and the only boardview available is a .CAD file. The archive contains that file and a schematic PDF.

1. The file is about a megabyte; a text editor shows readable sections listing parts and nets. It is a text boardview.
2. OpenBoardView reports an unsupported format, so you open it in FlexBV instead. The board appears with simple rectangular outlines.
3. You compare the outline, the CPU socket position and the memory slots with the board — they match. The revision in the archive name matches the PCB too.
4. Searching the CPU core rail name from the schematic highlights the VRM inductors, the MOSFETs and dozens of capacitors around the socket.
5. A quick diode-mode check shows one phase reading far lower than the others. The boardview tells you which MOSFETs belong to that phase.

Without the file opening, you would have identified those MOSFETs by tracing copper around the socket. With it, the search takes minutes.

Why design files are not worth the trouble

Native PCB design files contain far more than a boardview — every trace, every layer, design rules — and need the original design software to open properly. For repair, a boardview gives you what you need with a fraction of the effort. If a board only has a design file, a converter may be able to produce a boardview from it, but expect to spend time getting it right. Most of the time, the schematic plus careful work on the board is faster.

FAQ

Is a .CAD file always a boardview?

No. The extension is used by many programs. In repair archives it is usually a text-based boardview, but check the content before assuming.

Why does OpenBoardView open some .CAD files but not others?

There are several CAD variants. OpenBoardView supports some of them; FlexBV supports more.

Can I open a .PCB file in my PCB design program?

If it is a native design file from that program, yes. If it is a boardview export that happens to use the .PCB extension, no — it needs a boardview viewer.

What is the quickest way to tell a text boardview from a binary one?

Open it in a text editor. Readable part names and net names mean text; unreadable characters mean binary or compressed data.

Bottom line

Identify first, open second: check the size, peek inside with a text editor and look at the rest of the archive. Text CAD boardviews open in FlexBV and sometimes in OpenBoardView; .PCB files are either boardview exports or design files. When nothing works, look for another format of the same board in the boardview section.