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Hardware Hacking The hammer and tongs school of Overclocking. (NOT for the beginner and you assume all risks)


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  #21 (permalink)  
Old 25th January, 2006, 07:30 PM
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Is this a "happy" UPS now, Aedan?
Belkin UPS's are a good deal less expensive than APC branded ones. I wonder if their internal layout is essentially the same?
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Old 25th January, 2006, 09:30 PM
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Not yet - the FET just next to the diodes is toast. I wonder which part failed first, the FET or the diode? A failure of the diode would present a reverse voltage across the FET which wouldn't do it any good...

The APC units I have (SmartUPS) have significant amounts of steel in them, and internally they seem to be reasonably well built. Remember I haven't examined an APC UPS in quite the same way as the Belkin. It's rather more work taking a SmartUPS apart!
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Old 25th January, 2006, 11:34 PM
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Couple more pictures here...

One of the failed diode, and one showing the PCB where the FET used to live. Suffice to say, the FET is toast too.
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One Dead Belkin UPS-toasteddiode.jpg   One Dead Belkin UPS-toastedpcb.jpg  
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Old 25th January, 2006, 11:40 PM
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Quote:
Originally Posted by Áedán
Not yet - the FET just next to the diodes is toast. I wonder which part failed first, the FET or the diode? A failure of the diode would present a reverse voltage across the FET which wouldn't do it any good...

The APC units I have (SmartUPS) have significant amounts of steel in them, and internally they seem to be reasonably well built. Remember I haven't examined an APC UPS in quite the same way as the Belkin. It's rather more work taking a SmartUPS apart!
Yeah, the APCs are build like tanks and that is a fact. Hopefully, I'll be able to post up some pics of one somewhat disassembled here in the near future....
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Old 27th January, 2006, 06:54 PM
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That's one blasted diode. Any chance that replacing it as well as the FET will fix the booger? I'd be concerned that the circuit board looks toasted under the diode and the X-former has what appears to be an almost burned area on it.

Mmm, tanks. Maybe I'll spring for one, I definitely need a UPS. If only they weren't so un-sexy, so to speak.
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Old 27th January, 2006, 08:00 PM
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That's fairly normal for components that have been exposed to heat for extended periods of time, though, so I wouldn't be too worried about that.

I'd tend to suspect that the diode blowing out is what killed the FET. Question is, why did the diode blow, and did the loss of the FET take anything else?
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