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ic3b4ll

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@Raph_friend I see you too had the displeasure of working on a board full of WD40... It's horrible.

Also:
Parabéns pelo seu guia de reparação para as placas CPS2. Muito bom mesmo!

(Congrats on your CPS2 repair guide! It's really good!)
 

suverman

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Never use normal wd40 on pcbs unless you want to ruin it in a few months.
 

Raph_friend

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@Raph_friend I see you too had the displeasure of working on a board full of WD40... It's horrible.

Also:
Parabéns pelo seu guia de reparação para as placas CPS2. Muito bom mesmo!

(Congrats on your CPS2 repair guide! It's really good!)
Thanks!
Obrigado!
Arigatou gozaimashita!
 

adgenet

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white stains because it will dissolve the flux residue
Not to derail the thread too much, but I've seen this on some boards quite often after an initial cleaning with IPA, and never could find the best chemical to remove it easily without a lot of scrubbing and repeat rinsing with more IPA. Any suggestions?
 

stt1

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white stains because it will dissolve the flux residue
Not to derail the thread too much, but I've seen this on some boards quite often after an initial cleaning with IPA, and never could find the best chemical to remove it easily without a lot of scrubbing and repeat rinsing with more IPA. Any suggestions?
Have encountered same and did not find other way around getting that white stuff off. Soft or medium hard toothbrush is a good tool, btw.

I found another "reason" for using the WD40... You'll get rather dirty PCB with caps leakage marks looking good when you have thin oil film applied. Pictures will look nice, the PCB has somewhat new/clean outlook when the oil makes surfaces nice and shiny.
 

suverman

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why? I mummified all my PCBs lol. Actually only the expensive shmups. I think hard to work on them if there is a problem, but I asked around a few electronics guys, havent got any response that told me it was bad. Interested in knowing why it's a bad thing.
 

xodaraP

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It's good in a way because it adds a protective layer, a lot of operators like it.

The problem is the stuff is an absolute dust magnet and arcade PCBs in a cab or on a shelf in a warehouse covered in a dust magnet is... not ideal

The other problem is it's extremely difficult to remove and impossible to work on a board if it's coated in this stuff.
 

stt1

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Short update:

All socketed chips removed yesterday (total 43) and PCBs cleaned. Took partially three rounds for each four PCBs to get them cleaned up. I already did spot some possible problems now when the WD40 is off.

Next target: clean up the removed chips.
 

stt1

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Half of the chips cleaned. Takes huge amount of time... ~23 chips, nearly 2,5 hours (including two 15 minutes breaks).

Anyway. Two broken traces noted from another A board. Were there for sure before shipped. There was no such damage in the packing materials which could explain this. These traces seem to be connected to up/down buttons and confirmed to be broken with multimeter. I'll get those fixed and most likely the volume control is again functional.

Recapping is needed for at least another A+B set. Some really poor looking caps and leakage marks under a few.
 

stt1

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"<snack cracle> Houston, we have got the another B board back online, I repeat: another B board back online... Over <cracle>"

Another set of chips washed and installed back. The other B board fired up instantly again.

I believe the problem why B board went to the "green screen" -state was due to dirt and WD40 ruining the connection between eproms/sockets and large connectors between the PCBs.

A good clean-up did not change anything else. Nothing broke more or got any better functionally - even while everything got white spirit, dish (hand wash) soap and water, lot's of water. Sounds are still bad on another A.

Now it's time again to put his aside (too much time used for this project instead of sleeping/having a rest etc.) for the rest of the week. Next week targets: fix the so far spotted trace damages and put a caps order together. CPS2 list should be available online, but I need to get other stuff combined to same order as well.

Because of what broke today (waiting now for spare parts, which will be sent over from France today) at work: next week will be tough though, a big repair job in work right at monday - latest Tuesday, estimated +12 hours (+ lunch time + driving) work day coming... So it might be that I wont be able to do a lot with CPS2 stuff next week. We'll see.

"Over and out"
 

stt1

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Things are pretty chaotic at the moment, but at least some time poured into this project too:

Last week targets were completed as planned. Two traces fixed (I took pics, but not online yet) and sound volume controls are working again. Nothing else got fixed on sounds. Caps list was collected too. It was pretty different on rev. 6 and 7 than in earlier ones (started building from rev. 3 list I found online).

I collected some other boards (2x Hyper Olympic, one pinball PCB) caps needs etc. late last week and Monday-Tuesday. Components ordered last night. Now it's just waiting that component delivery arrives and then do the caps replacement.
 
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