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Consequences of disconnecting the ATX 12V?

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louxtix Posted messages 84 Registration date   Status Member Last intervention   -  
louxtix Posted messages 84 Registration date   Status Member Last intervention   -
Hello,
What are the consequences of disconnecting the ATX 12V power connector from the motherboard while the PC is running? Can the processor burn out?

Configuration: Windows 7
Motherboard Gigabyte 78LMT-USB3 Rev 5
Processor AMD FX 6300

2 answers

  1.
    flo88 Posted messages 28530 Registration date   Status Contributor Last intervention   Ambassador 5 184
     
    Hello

    Don't unplug!
    First.
    Then the consequences are that the CPU doesn't have enough power to run, which will cause everything to crash.
    In principle, it won't have more consequences; it's like a power outage.
    In two words: 
     Don't!

    Hello to you all
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    1. louxtix Posted messages 84 Registration date   Status Member Last intervention   18
       
      Actually, it's already done (accidentally) ... and since then, black screen, I'm looking for the cause.
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  2. louxtix Posted messages 84 Registration date   Status Member Last intervention   18
     
    Well, I'll clarify my situation a bit: I have a somewhat special (and shaky) setup with two power supplies. Let me explain, I have a graphics card that requires too much power from my main power supply, which is why I added a second power supply:

    And, I don’t really know why, but I connected the 12v ATX connector from the SECOND power supply to the motherboard. And that’s where the drama begins: the green wire (in the diagram) comes off => GPU turns off => no image => I reconnect it => nothing => I restart => nothing, and so on (I tried with only one power supply, without the graphics card, I cleared the CMOS, I tested the RAM... without success)

    And all of this just to avoid buying a more powerful power supply...
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    1. flo88 Posted messages 28530 Registration date   Status Contributor Last intervention   5 184
       
      Mmm.......
      Well, we need to buy a more powerful power supply and see what happens, because the hot unplugging probably didn't damage the CPU (though it's possible) but rather the power supply or the motherboard.
      The easiest thing to change first is the power supply.
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    2. louxtix Posted messages 84 Registration date   Status Member Last intervention   18
       
      I just connected the processor to another motherboard (without a hard drive or anything, just one RAM stick) and it starts: I have the POST (or pre-boot sequence) displayed on the screen. I conclude that the processor is working. Is that correct?
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    3. flo88 Posted messages 28530 Registration date   Status Contributor Last intervention   5 184
       
      Same deduction for me.
      I think it's the power supply that took the hit first, the motherboard second, but if there wasn't an electrical arc when it got disconnected, I don't believe the motherboard was affected.
      However, one thing to do if you haven't already tried: unplug the power supply from the wall, press the power button on the PC several times; this effectively drains the residual charge from the capacitors, both on the motherboard and the power supply. This sometimes does wonders, especially on power failures, much like in this case.
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    4. louxtix Posted messages 84 Registration date   Status Member Last intervention   18
       
      I already tried the trick but I’ll do it again just in case. Then the motherboard is new. If it were ever fried, I could try to use the warranty.
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    5. flo88 Posted messages 28530 Registration date   Status Contributor Last intervention   5 184
       
      If it ever got burned out, I could try to use the warranty.

      Yes, it will go through without any problem, there's no way to detect a mishap, anyway, they don't investigate, they just replace it, period.
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