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 Compaq Portable 286 PSU? View next topic
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harshbarj



Joined: 01 Oct 2004
Posts: 163
Location: behind you!

PostPosted: Thu Feb 21, 2019 7:22 pm Reply with quoteBack to top

First off hello. It's been a while. Shocked

I have decided to bring a lot of my old computers out of storage, and after 10 years of sitting there are some issues (and some casualties). Embarassed

I plugged in a Compaq portable 286 and when I turned it on there was a loud bang, followed by a lot of reddish smoke. Turned out a tantalum detonated. I need to replace it, but because tantalum capacitors obliterate themselves when they go, I have no clue to it's value. Is there a schematic available somewhere? It was one of the larger radial style caps along a row of electrolytic capacitors.

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Puckdropper
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Joined: 02 Oct 2004
Posts: 756
Location: Not in Chicago

PostPosted: Thu Feb 21, 2019 10:13 pm Reply with quoteBack to top

Welcome back! I had you figured for "Internet dead".

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Skyfrog



Joined: 01 Oct 2006
Posts: 27
Location: USA

PostPosted: Sun Feb 24, 2019 2:05 pm Reply with quoteBack to top

Ah, the magic smoke. I couldn't find a schematic for it but if it helps the part number for the power supply in the Portable 286 is 102818-001. I'm guessing that's where the cap blew. Here is the maintenance and service guide for it if you don't have it already, unfortunately it doesn't have any schematics. I'll keep an eye out though. http://www.minuszerodegrees.net/manuals.htm#Compaq
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T-R-A



Joined: 02 Oct 2004
Posts: 575
Location: Western NC

PostPosted: Sun Feb 24, 2019 5:44 pm Reply with quoteBack to top

harshbarj wrote:
I plugged in a Compaq portable 286 and when I turned it on there was a loud bang, followed by a lot of reddish smoke. Turned out a tantalum detonated.


I gather this was in the P/S section? Any idea what was the reference designator on the board (C1, C13, etc.)
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harshbarj



Joined: 01 Oct 2004
Posts: 163
Location: behind you!

PostPosted: Sun Feb 24, 2019 10:51 pm Reply with quoteBack to top

T-R-A wrote:
harshbarj wrote:
I plugged in a Compaq portable 286 and when I turned it on there was a loud bang, followed by a lot of reddish smoke. Turned out a tantalum detonated.


I gather this was in the P/S section? Any idea what was the reference designator on the board (C1, C13, etc.)


It was.
It was c16. About half the cap is gone. The other caps of the same size are all 25V 68UF, so it's likely this one was also that kind. I'm likely to fully recap this psu other than the large electrolytic caps (made by sprague).
Image

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