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papichulo's picture
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Joined: 2018 Feb 21
Powerbook smells like poop!

I turned on a old 280c and it smelled like rotting fish and POOP!! I opened it up and found leaking capacitor and a computer chip that is damaged. I dont know what to do. Is it the chip or the capacitors? Thanks

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SkyCapt's picture
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Joined: 2017 Jan 11

Capacitor leak has an odor but not that bad. Remove circuit board. Wash case grilles and fan blades, try not to harm the fan bearings. Spray the circuit board a lot with board cleaner aerosol spray can. Let it all dry before reassembling/powering. Replace the capacitor(s) before using it with matched rated new parts, I assume they are cylindrical containing electrolyte, replace all capacitors that look like they're bulging.

Ignore the chip, your message sounds like it's functioning. Which chip is it? Damaged due to the electrolyte leak?

papichulo's picture
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Joined: 2018 Feb 21

I think it was damaged from the leak but i literally took the thing apart after turning it on and smelling that, the little black chip under the board below the leaking caps is chipped its a Fairchild NDS9435  thats what i found looking it up

SkyCapt's picture
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The chip is "chipped", like cracks in its shell and crumbly bits missing? It might have detonated from the inside-out. Just clean up around it, see that none of the chip pins are shorting together with corrosion or anything, and if the chip belongs to some peripheral activity then the machine might still work for certain tasks.

24bit's picture
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Joined: 2010 Nov 19

Does the chip look like this?

Description

Power Switch

If so, the chip seems to be a part of battery power switching.
The item seems to be available for 40 cents or so, but are you willing and able to solder it?
https://www.alldatasheet.com/view.jsp?Searchword=NDS9435&sField=2

Rotten fish smell is typically for Phenol plastics, which many circuit baords were made of.
When Phenoplastics get burned chemically or by heat, thats the smell you would expect.

m68k's picture
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Joined: 2016 Dec 30

Way back then some early plastics even smelled like urine when burned. Caused me great embarresment during my childhood days. Shock

SkyCapt's picture
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My experience when a chip explodes inside, it often happens due to another component failure and then "takes out" even more components typically a resistor or a trace burns open.

If youre lucky the only other fault is the capacitor(s) themselves. But can you find other damaged pieces, maybe near the chip, maybe see both sides of the board.

papichulo's picture
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Joined: 2018 Feb 21

Yah it looks like that and theres more then one of them. Only the one chip is burnt right under the board. Mabie the capacitor fluid leaked under the board and made conract with the chip?

SkyCapt's picture
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Joined: 2017 Jan 11

Fluid made contact with the chip? Or if that seems unlikely, the failed capacitor itself had let an overvolt or overcurrent into your chip.

capt_chuckl3s's picture
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Joined: 2019 Sep 17

Electrolytic capacitors have a shelf life and will swell up and pop when they have outgrown their usefullness. They can leave a nasty smell when they pop and the juice inside the capacitors will leak out all over the board where the capacitor. If you're skilled with a soldering iron then good news because replacing capacitors is a pretty easy repair. Happy soldering Big smile