having issues with Data East Simpsons.....help!

[liquid134]

Hello everyone.

a new friend of mine has an old Data East simpsons pinabll machine thats experiencing an interesting issue. Heres what i know.

A few months ago, someone came out to work on the machine (it wasnt booting up) from what i can visually tell, part of the power harness was badly burnt and this guy (poorly) wired around it.

when i first was asked to look at the machine, it was randomly restarting or once n awhile would have a loud hum and not boot. I thought i had narrowed it down to the part of the harness the guy hacked up. i managed to solder up and clean up the wiring as best i could without redoing the whole harness. After that, everything seemed to be back to normal (so i thought)

Got a call about a week later.....game wont boot. scoreboard/marquee light up and it has a loud hum from what i can tell, is the speakers(which it was doing on occasion when i first took a look at the machine). Pinballs arent my expertise, but i am knowledgeable in electronics. First things come to mind, are a ground problem/ground loop, or power supply.


Anyone have any thoughts?

[smartbomb2084]

Check the health of the +5V at the CPU board.   DATA EAST CPU Boards only need +5V to boot.

Was CN1 on the Power Supply board one of the burned connectors that were repaired?   

There is +5V and Ground Test Points on the CPU Board directly to the left of CN17 where the power enters the board. Upper left corner on board near the battery holder.

Check out the PinWiki ...     

http://pinwiki.com/wiki/index.php?title=Data_East/Sega