WPC-95 scrambled DMD

[Alan Syson]

Trying to get machines sorted for NERG.
MM display has gone weird, hoping it was going to be a simple case of reseating ribbon cables.
Did this and everything just went blank. Tried again and all looked good, fired up a game, no flippers.
Switched off, reseated, and I’m back to where I started (see vid).
LEDs check out, fuses OK but nothing at 50v test point.
Looked online, Pinside mainly, can’t see too many pointers.
Anyone here with any ideas? Send the board off?, usually use @pinballmania but NERG’s not too far off. Anywhere Newcastle area any good with this sort of thing, might be a quicker turnaround,


TIA Alan

 

[Sgt GrizZ]

Alan have you got ribbon cables in another game to swap in and try ?
I have had similar craziness and it was def the ribbon cable at fault.

 

[Alan Syson]

Alan have you got ribbon cables in another game to swap in and try ?
I have had similar craziness and it was def the ribbon cable at fault.

They’re only a few months old Ive though I could swap them out for the ones in JY.
Would that knock out the 50v?
Alan

 

[Sgt GrizZ]

They’re only a few months old Ive though I could swap them out for the ones in JY.
Would that knock out the 50v?
Alan

Ah. Missed that bit about the 50v.
Dunno Who knows - when these barstewards throw a wobbly nothing is off the table

 

[Asiapinball]

Troubleshooting Williams Bally WPC Pinball Machines -

Initial troubleshooting of Williams / Bally WPC pinball machines made from 1990 - 1998. Check those voltages - step by step instructions.

homepinballrepair.com

Alan there is a good troubleshooting section for 50v on wpc95 here.

Paul

 

[strobey]

Looks like the DMD pages are being shifted over each other.

Gentley push on the ASIC and see if the display corrects itself.

If so, switch off, remove & reseat (or try a firm push if you've not got a tool)

 

[Alan Syson]

Looks like the DMD pages are being shifted over each other.

Gentley push on the ASIC and see if the display corrects itself.

If so, switch off, remove & reseat (or try a firm push if you've not got a tool)

You f%*+ing genius. I owe you a beer
Alan