A very useful way to test the Neo Geo AES is to replace the BIOS with a socket, and then drop in the Diagnostic BIOS.

This Diagnostic BIOS cannot play games, its sole purpose is to test the hardware and report errors to help easily diagnose issues on the Neo Geo.

More details about the BIOS can be found 

 to program a blank BIOS chip if you have one, or just buy a Diagnostic BIOS directly from us.

RF Module (Intellivision)

Diagnostic BIOS (Neo Geo AES)

Schematics (Neo Geo AES)

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