Punch Out PCB Corrosion

[Keroppi]

I'm not too sure I can handle this one myself. If anyone has a board to sell, or would be willing to give repairing this board a go, please PM me. It's dead as a doornail. Tell me, is this one of those times I should just find a new board?

Above the battery holder, this diode read ~ .1 on the DMM; the 16v cap read a dead short (that's never a good sign)...

It has extended to the chips to the left beneath the dipswitches:

...and another pic beneath the battery older, illustrating how it has soakeded under the PCB coating:

...SOOOO...am I screwed

 

[spanks_4]

my thoughts and i could be really wrong. first you need to clean the corrosion off so it doesn't spread anymore. whatever components are screwed up replace them. the traces that are gone jumper them to where they actually go. its hard work, but i think you can save yourself a lot of cash if you spend the time to solder jumper wires all over the place. although i could be completely wrong on this.

 

[pacmandude]

I repaired a board like that once. I removed all components near the corrosion. I sanded the board down to the copper and brushed it with a vinegar solution and rinsed with alcohol to neutralize any remaining battery chemical. All components removed are then replaced. I then installed a remote battery holder. It's a LOT of work though.

 

[spanks_4]

also if you don't want to do it im sure you could probably pay some repair guy to do it. may still be cheaper than buying new boards.

 

[Keroppi]

I am well aware of HOW to fix it, but unfortunately, I am worried I am not capable. Sure, I can clean off the board, probably even figure out what kind of diode it *was* in the corner, and replace the parts. The problem is, that's about where my experience brings me to an abrupt wall. I have no ability to actually get down on it with a scope and figure out what is functioning, what is not, and why.

I have a pinball MPU that was at one time in a similar condition. Even with a tutorial, I spent dozens of hours, replaced 40+ parts (I was quite proud of myself) and...nada. No closer than I started.

In this case, if I can't get any takers, or quickly find another board, I'll go ahead and replace what I can in the vicinity, since there's not a large number of parts that seem to be affected. But past that, I don't even know where to look for problems. Any tips?

 

[cadillacman]

that should be too bad.. fix this!!!!!
these were taken AFTER scraping and cleaning lol...

 

[Keroppi]

That looks very similar to my pinball board...

a gameplan MPU

 

[Keroppi]

Well that was QUICK!!

Thanks ybot! $50 for an untested board set. At least it's not corroded. Fingers crossed!!