(Topic ID: 213588)

Advice for circuit boards

By mmr61184

5 years ago



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#1 5 years ago

Electronics are my weak point when it comes time to pinball games. I just started putting my T2 that I am restoring back together and was looking at the boards for the first time in a few years. This was a heavily routed game and wanted to know if there is anything to look for in the boards I would hate to get the whole game back together and find out the boards are shot. I dont see any broken tracers but definitely some crispness on the back of one of the boards. Any advice would be appreciated

#2 5 years ago

Battery damage on the MPU and burnt headers & traces on the driver board.

Normally, I do the electronics *first* so I can see what I'm going to have to deal with and what's working and what's not-- all *before* a tear-down happens.

That way, when I put things back together and if there's something that's not working, I had a baseline for the game already so I can tell if it's something that I did that caused a problem (and can potentially reverse or correct), or if it was something that didn't actually work in the first place and needs to be troubleshooted more thouroughly.

This can sometimes help eliminate hours of maddening troubleshooting when you have a starting point to refer back to.

#3 5 years ago

Post pictures of the boards including one closeup of the MPU, above and below the batrery holder.

#4 5 years ago
Quoted from PinballManiac40:

Post pictures of the boards including one closeup of the MPU, above and below the batrery holder.

Here are some front and back of all the boards. I just realized that they hacked the crap out of the MPU board, they actually took the battery holder our and replaced it with what ever the hell that things is. All the headpins are fine no crispy ones on the main board

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#5 5 years ago

Your MPU board has alkaline corrosion under the solder mask. That needs to be cleaned up along with that battery hack. It would be interesting to see why they added a resistor and diode in series.

Fuses are missing from the sound board. Perhaps cannibalized. Who knows.

GI header burn is typical on T2. Can't see any on the back of the board but look at J120/121 and J115.

--
http://ChrisHiblerPinball.com/contact
Chris Hibler - CARGPB #31
http://www.PinWiki.com - The new place for pinball repair info

#6 5 years ago
Quoted from ChrisHibler:

Your MPU board has alkaline corrosion under the solder mask. That needs to be cleaned up along with that battery hack. It would be interesting to see why they added a resistor and diode in series.
Fuses are missing from the sound board. Perhaps cannibalized. Who knows.
GI header burn is typical on T2. Can't see any on the back of the board but look at J120/121 and J115.

Is the MPU board worth saving at this point I am sure I can search on here and see if I can get a replacement?

I pulled every fuse from all the boards doing a full restore and almost everything on this game was filthy so figured I would start fresh.

Surprisingly the GI isn’t burnt to a crisp

#7 5 years ago
Quoted from mmr61184:

Is the MPU board worth saving at this point I am sure I can search on here and see if I can get a replacement?

Yes, it is worth it to worth saving and to have NVRAM installed to keep from putting a Rottendog board in it's place, which has it's own issues.

#8 5 years ago

Yep. Worth saving.
I saved a similar one for a client just recently.

Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact/
http://www.PinWiki.com - The new place for pinball repair info

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