Space Invaders Deluxe Issues

Phetishboy

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Bought an SI Deluxe at auction last week. It was on dead row and was not plugged in during the auction to see if it would even power up. I got it home, messed with it, cleaned up the outside and plugged it in. Good news, I got a loud humming sound and the monitor came to life. Bad news is all I see is a rug pattern. The inside of the game smells pretty moldy, so I am sure there is some corrosion and moisture damage. Where do I start and is anyone fixing these boardsets anymore?
 
i'm not going to be a ton of help on this, but i'd start by checking voltages (http://elektronforge.com/TestMdwPS.htm) and then checking for cold solder joints on the pins for the connector on the p/s.

when i got my space invaders i had a missing saucer sound as well as a random boot to rug pattern, and reflowing the solder on the p/s fixed that.
 
Replace the rom sockets and CPU socket...make sure slam switch isn't stuck closed, make sure all voltages are spot on including the reset line. Clean up the 2 fuses in the power brick.

Get board working without roms (bars on screen) before anything else.
 
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