Radar screen flashes off and on

[crybllrd]

I bought a boat with a Furuno Marine Radar model 1623 installed. The previous owner said it just recently stopped working properly.

When I power it on, the screen comes on all white for about a quarter of a second then off for a second, back on white for a quarter second then off, etc until I kill the power to it.
I've never worked on a radar before so i have only checked the inline fuse (which is not blown).

What else can I check? The troubleshooting in the manual doesn't cover my problem.

Thanks in advance!

 

[Johnny Electron]

Try to turn on the display without the scanner cable connected to see it changes anything.