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Thread: Can a Underrated Power Supply Kill a Motherboard?

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    Magic Smoke is offline If you see me than you did something wrong
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    Default Can a Underrated Power Supply Kill a Motherboard?

    So my parents bought a cheap power supply online about a year ago when the power supply in their gateway PC failed about 3 or 4 years ago.

    This power supply was a replacement for the previous replacement that lasted around 2 or 3 years (which was the same cheap brand but different board).

    Now during the year or so this PSU was in this PC, it had some issues and was finally removed about a week ago when the PC would not start up at all.

    So i took apart the cheap PSU and found the board inside was an FSP board rated for 235 watts when the label said it was a 400w PSU (the label had no model number on it).

    I was going to ask here was a decent replacement would be but they ran off and bought a Corsair VS400 PSU (since it was highly rated on Amazon) but after putting in, the PC still does nothing. The only thing that happens when you press the power button is the fans and hard drives spin up but nothing else happens other than that.

    So what i want to know is since this power supply was so underrated, could it have killed the motherboard? I know too much ripple on the output of a power supply can kill sensitive electronics, so i wonder if because the power supply was pushed beyond what it was rated for (and some of the capacitors were on their way out) would have caused ripple to go way out of spec or something like that.

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    If a PSU is run over it's rated capability, voltages can drop considerably causing motherboard regulators to overwork to compensate, or ripple can be out of spec causing the board to have to do all the filtering....

    ....but if the PSU was actually an FSP, I doubt either happened. Those tend to have pretty good protections that shut the PSU off in the even that any of these conditions may actually happen.

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    Magic Smoke is offline If you see me than you did something wrong
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    I think the PSU is a older model FSP unit that might not have any of these features.

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    Would be good to know the model so we can look it up.

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    I think this unit might be an FSP235-60GT.

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    Yeah. That's pretty old.

    Sorry.

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    So i guess that means it may have fried the motherboard.

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    Quote Originally Posted by Magic Smoke View Post
    So i took apart the cheap PSU and found the board inside was an FSP board rated for 235 watts

    ...

    if because the power supply was pushed beyond what it was rated for

    A normal PC without fancy video card would probably pull less than 235 watts.
    Last edited by ashiekh; 07-26-2018 at 02:28 PM.

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    Why People modded stuff...more filtering or yeah capacitor quality....Correct, Ripple is bad with this stuff and ageing and as well increasing ESR.
    But I'm sure it had to of had some Protection....still rare and hard to kill anything.....Iv'e smoked I don't know how many units and it never killed anything...
    Last edited by Batboy88; 07-26-2018 at 11:33 AM.
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    Default

    Quote Originally Posted by Magic Smoke View Post
    So i guess that means it may have fried the motherboard.
    With a ~15 Year old PSU that is entirely possible because they are not built for modern, +12V Heavy loads. They are built for +5V heavy loads, as you can see on the Rating for +12V -> 8A or 96W...

    And then there is the Filterelemets that also don't age well and die with time...

    So all in all, it is very possible that it might have killed something because it wasn't designed for the Load...

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