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Thread: Tom's Hardware: Why Power Supplies Fail

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    Default Tom's Hardware: Why Power Supplies Fail

    http://www.tomshardware.com/news/why...sus,36712.html

    The component of your PC that's under the most stress is the power supply (PSU), because it's the power conversion bridge between the system's components and the mains grid, which means it has to deal with every abnormality of the mains and make sure those abnormalities don't affect other components. That's a tough job, and it gets even harder if there's no power conditioner or uninterruptible power supply (UPS) installed.

    In low-quality PSUs, the first parts to go are usually the electrolytic caps and the cooling fan. (You can read more about electrolytic cap life calculation in our "PSUs 101" article, where we also discuss the various fan bearing types.) So those are the parts that tend to go first in low-quality PSUs, but what causes failures in PSUs that use quality components? We'll get to that, but first let's take a look at an especially important component in today's PSUs: the Multilayer Ceramic Capacitors (MLCC).

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    This is why i spray RAID in all of my PSUs....

    No. Seriously.

    Bugs do like to commit suicide in PSUs.

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    From this I can say that as consumers we should probably be weighing the manufacturing process and good soldering more than we do. Makes me want to go buy Sirfa units, as I believe their soldering is usually good (I could be wrong, too many S names).

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    How many failures are due to soldering?

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    Quote Originally Posted by jonnyGURU View Post
    This is why i spray RAID in all of my PSUs....

    No. Seriously.
    I take it you don't spray enough for it to start conducting? :-)

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    1 Thing seems to be missing (or I've overlooked it):
    The soldering process.

    Either cold Solder joints, broken or just not enough lead on the board for whatever reason (maybe they put the PCB the wrong way around on the machine or the Engineer didn't hink about the wave soldering machine when designing the unit).

    Not that common but happens...

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    Quote Originally Posted by Stefan Payne View Post
    1 Thing seems to be missing (or I've overlooked it):
    The soldering process.

    Either cold Solder joints, broken or just not enough lead on the board for whatever reason (maybe they put the PCB the wrong way around on the machine or the Engineer didn't hink about the wave soldering machine when designing the unit).

    Not that common but happens...
    The article mentions that as one of the main causes of the primary cause of failure, cracking ceramic capacitors. Though it mentions solder repairing, it applies to all soldering I'd assume.

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    In my experience (which is not extensive) I have not seen much trouble with cold soldered joints in a power supply. Now secondary capacitors... lots of trouble.
    Last edited by ashiekh; 03-26-2018 at 08:14 PM.

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    Default

    Quote Originally Posted by jonnyGURU View Post
    . . .

    Bugs do like to commit suicide in PSUs.
    It's warm in there.
    Core i7 4770K @4.3GHz + iGPU | GA-Z87X-UD4H | 2x8GB Crucial Ballistix DDR3@1600MHz
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    Quote Originally Posted by ashiekh View Post
    In my experience (which is not extensive) I have not seen much trouble with cold soldered joints in a power supply. Now secondary capacitors... lots of trouble.
    Then you haven't seen a lot of PSU's.

    Most infant mortality is due to poor soldering that fails AFTER a number of cycles (hot, cold, hot).

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