(Topic ID: 29090)

TECH: what is this garbage?

By Holy_Pickle

11 years ago



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#1 11 years ago

Hi,
As you can see on the pics, i have ploblem with my DMD on Scared Stiff.
I intalled a freshly rebuilt and tested A/V board, i swapped DMD cables and the DMD itself...Still have the problem.
Any idea?
Could it be the video rom????

image.jpgimage.jpg image.jpgimage.jpg

#2 11 years ago

First thing is be sure ribbon cables are red stripe pin one each end from CPU to DMD driver board to DMD.

LTG

#3 11 years ago

Red stripe on pin #1 both boards and make sure its fully plugged in and seated.

( Not off a row of pins, easy to do)

#4 11 years ago

No such thing as a video ROM on WPC games. All display info comes from the CPU. So check what others have suggested and if all is good, you could have a CPU issue. Swap CPUs to confirm.

--
Rob Anthony
Pinball Classics
http://LockWhenLit.com
Quality Board Work - In Home Service
314-766-4587

#5 11 years ago

Will do!
Thanks!

#6 11 years ago

Guys, i checked the cables, that's ok. I will swap CPU's but i need to know how many eproms i should remove and install on the other CPU?
I see two, is this ok? (one with the version 1.5 and another one)

#7 11 years ago

On wpc95, there is only one EPROM. The other is something else. Maybe the security chip? I guess swap that also if it's socketed on both.

#8 11 years ago

Ok, so i should not have anything else than eprom and security chip to swap right?

#9 11 years ago

Don't swap anything but the board, you don't need to change the Eprom to test the display.
I would swap ribbons first and make sure that isn't the problem.
If you don't have spare ribbons recrimp the ones you have in a vise, go easy and don't crush it.
If that fixes it order new ones, more than likely it will do it again.

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