2012 build wont post

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Re: 2012 build wont post

Postby Karlsweldt » Tue Mar 29, 2016 4:32 pm

rascard2007 wrote:... probably in the secondary side, seen this many times...

Common that the caps in lower-quality PSU models are rated only at 85°C, not at 105°C, as with quality PSU models.
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Re: 2012 build wont post

Postby evasive » Wed Mar 30, 2016 11:28 pm

Common in el-cheapo power supply units to have them using Chinese el-cheapo caps with inferior aluminum foil, inferior filtering on the electrolyte fluid, inferior testing. Also the semiconductors are usually underrated, the central transformer is undersized, the heatsinks are undersized, the mains filtering (if any!) is stripped beyond the bare minimum...

This combined with virtually no QA makes many of them a fire hazard in the long run...
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Re: 2012 build wont post

Postby rascard2007 » Thu Mar 31, 2016 6:49 am

evasive, your comment sounds quite creepy..... :lol:
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Re: 2012 build wont post

Postby Karlsweldt » Thu Mar 31, 2016 4:11 pm

rascard2007 wrote:evasive, your comment sounds quite creepy..... :lol:

That is why there is a fuse inside the PSU, rated for about 10% above maximum input.. and at 250 VAC. Mandated by UL rules.
The aluminum foil used in capacitors has a dielectric coating, to effect terminal polarities. If not properly applied, then the foil can be eaten away by the electrolyte, and flakes short-circuit the capacitor.. often with a loud bang and debris field.
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Re: 2012 build wont post

Postby donmid94 » Fri Apr 01, 2016 5:03 pm

Sorry for delay in responding; I found a new board from the same platform for a fairly reasonable price and everything works great. It performs almost exactly the same as the old board and I am very pleased with the whole deal. Thanks to all of you for your sage advice...

Thanks again, Don
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Re: 2012 build wont post

Postby rascard2007 » Tue Apr 05, 2016 8:30 am

Karlsweldt wrote:That is why there is a fuse inside the PSU, rated for about 10% above maximum input.. and at 250 VAC.


I tough that this fuse is to avoid the PSU making a big fire in the whole room
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Re: 2012 build wont post

Postby Karlsweldt » Tue Apr 05, 2016 3:15 pm

I tough that this fuse is to avoid the PSU making a big fire in the whole room

That is definitely a primary reason. But if something in the PSU or in the computer does not cause a higher load than the fuse rating, a serious fire is still a possibility. If the unit has a UL sticker with a rating number, you can be fairly assured it is safe.
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Re: 2012 build wont post

Postby evasive » Wed Apr 27, 2016 12:02 am

unless you have an el-cheapo chines one with a fake UL ID and sticker.

In short: a good power supply costs money, it is the base for your whole system.

Would you drive a car if the engine might overheat, fall apart, explode or simply fail at any given moment?
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Re: 2012 build wont post

Postby Twisty » Wed Apr 27, 2016 11:43 pm

evasive wrote:Would you drive a car if the engine might overheat, fall apart, explode or simply fail at any given moment?


You mean that you'd never drive a Fiat? :lol:

I've bought and driven cars that are way cheaper than my PC PSU, and their engines have overheated, fallen apart, exploded or randomly failed :lol:

But yes quality PSU is worth it for many reasons, for one thing the PSU and case are the two things you are most likely to be able to transfer to a future PC build.

The fuse is likely to pop and stop a fire if one of the FETs shorts on out but does not guarantee stopping a fire for all modes of failure, also fuses don't do much in terms of saving the motherboard and other components from power spikes or brown outs caused by a faulty PSU.
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