Power supply help?

Discussion in 'Troubleshooting and Repair' started by Neo299, Oct 11, 2018.

  1. Neo299

    Neo299

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    I bought an arachnid top gun dart game. The owner had it in storage and assured me that it worked. I had no way of testing it. Got it home and of course it will not come on. The power supply, switching type is making a buzzing noise. The 12v lead is reading low around 10v and the 5v is reading 3v. So I assumed a bad power supply, but then I noticed when I unhooked the main board the buzzing stops and I get the right volts. 12vs and 5vs. My question is should a power supply be tested under a load. I also tried using a computer power supply, but I think it has too many amps. The main board started getting hot so I pulled the cord. I don’t want to spend money buying the wrong part. Thanks.
     

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    Neo299, Oct 11, 2018
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  2. Neo299

    Bluejets

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    Main board pulling excessive current? Did you measure it?
    Instances such as this it can be an advantage to use a series lamp to prevent any further damage while live testing.
     
    Bluejets, Oct 11, 2018
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    poor mystic likes this.
  3. Neo299

    Neo299

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    No. I did not test that or even know how.
     
    Neo299, Oct 11, 2018
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  4. Neo299

    Bluejets

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    Given that, best you get local assistance from one who does.
     
    Bluejets, Oct 11, 2018
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  5. Neo299

    kellys_eye

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    which means the main board has an 'issue'.

    Try an alternative PSU (use an old computer PSU if you have one) and see if it still happens. Otherwise post a close up, in-focus, image of the main board so we can look for potential problems.
     
    kellys_eye, Oct 11, 2018
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  6. Neo299

    dave9

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    Focus on what part of the mainboard started getting hot. Granted if that's a linear regulator on it, it may get a bit warm to hot but shouldn't pull the PSU output down that low. The PSU may need new capacitors AND there may be a mainboard fault, both.
     
    dave9, Oct 12, 2018
    #6
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