Help with SE/30

[Charlesdeodato]

I started my SE/30, just for fun today and I had this.



I've had my SE/30 for 4 months now, and I started it just last week with no issues whatsoever.

I was going to change its capacitors anyway, but is that really simasi mac? Or, more worryingly, is it even worse ?

Maybe RAM? I didn't touch any of the ram slots though.

What do you think?

BTW, have removed PRAM battery, just in case.

 

[uniserver]

looks worse,  caps/wash/dry might alone fix it... but may not, may still need some patch lines now. 

It would be a great starting point though.   it does need caps.

 

[Charlesdeodato]

Actually, it was the Ram/Rom which was causing the problem... I reseated the ROM and cleaned the ram and the slots on the mobo. Must be the dust. It is now back as normal. Thanks a lot though for bothering to write on the post.

 

[techknight]

It still needs cleaned and recapped. No getting away from that. Ever...

 

[Paralel]

This is why people should just recap and not play with their compacts before they do so, you never know what might happen with cap goo sitting around, slowly eating through traces, vias, IC legs, etc...

I would imagine electricity actually moving along/through the cap goo could possibly amplify the corrosive properties of the goo several orders of magnitude just due to energy now being provided to accelerate a chemical reaction.

It would be an interesting technoarcheology research project, does using the mac with cap goo leakage present actually accelerate the rate of goo destruction of a motherboard and/or increase the potential for a catastrophic component/system failure?

 

[CompuNurd]

It would be an interesting technoarcheology research project, does using the mac with cap goo leakage present actually accelerate the rate of goo destruction of a motherboard and/or increase the potential for a catastrophic component/system failure?

http://www.discovery.com/tv-shows/mythbusters/mythbusters-database/salsa-eat-through-bars-of-jail-cell.htm

We aren't trying to dissolve a prison bar, just a small trace on a motherboard, so it is more than likely possible.

 

[techknight]

The part that sucks about this is, ive seen traces/vias fail even after everything is cleaned up and done. Not common, but it does. Probably from the most badly damaged traces. 

 

[Paralel]

Yeah, I would imagine the trace was so badly damaged in those cases that the wire had derated far enough that it was no longer capable of carrying the signal without breaking.

 

[techknight]

yea. ive seen it happen to me a couple times. Fix it, working great, ship it out, come right back with a new problem, another open via/trace. Odd but it happens. 

I still think the most odd thing thats happened thus far, is the portable logic board detonating SWIM chips. I still haven't figured out why that happened. 

 

[uniserver]

yup that is a little strange... i think its when the 12v rail goes south... or the caps go and the boost reg ---   creates un desired power.

I think the FDD pulls current through the SWIM. 

 

[Charlesdeodato]

I am going to recap all of the 11 capacitors on the board (ie only the smd ones), as these are the ones to worry about. I have no sound. I am going to replace them with an identical smd aluminium type (closer to the original ones). I know that I will have to replace them again in ~20 years but i can live with that.

I will do that only after I get hold of a 14" macintosh display. I am currently working on a mod (https://68kmla.org/forums/index.php?/topic/15369-iisicolorpivotii-pds-card-hackproject™/) and I need to test if it works first then I will have to build my own pds extension cable. I will ask someone to recap it for me and in the meantime, i will be making that cable.

I live in France, and it is quite difficult to find an apple branded display, as I don't want to buy just any okd crt display, might as well be the best one (Made by Apple )

Thanks to all the lads that participated to this thread!

See you around

Charles