Funhouse switch gremlins

Raikus

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Looking for a little guidance here...

My Funhouse suddenly decided to stop working with switches 11 (right flipper), 25 (lock mech right), 26 (Steps light extra ball), 27 (lock mech center), and 28 (lock mech left).

"Aha!" You say, "Sequential numbers mean ground failure for that column or connector." Not so. Ground tones from 28 to the connector and switch 11 is on another column/row is not working either. Is this something that a IC chip on the power board could cause? So far I can't find anything under the playfield that would be causing this.
 
If 21,22,23, and 24 are working. I doubt it's a board issue.

LTG : )
 
Nope. Still trying to figure it out. Nothing under the cab seems to be causing this. Same for connector.

I've had a similar issue before, check U18, U19 and U13. These do go out believe it or not... I'm betting one of, if not a combonation of these IC's are causing the issue. My FH had weird switch problems, tracked it down to U18, replaced that, it fixed some but not all of the problems, went upstream to the U13, replaced that and it's good as new. You can actually meter it to ground on each pin and it will tell you if it's internally shorted or not. It's been a while and I don't remember specifics but that's how I found the problem.
 
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