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Power supply help?

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

  1. Neo299

    Neo299

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    Jan 29, 2018
    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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  2. Bluejets

    Bluejets

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    579
    Oct 5, 2014
    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.
     
    poor mystic likes this.
  3. Neo299

    Neo299

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    Jan 29, 2018
    No. I did not test that or even know how.
     
  4. Bluejets

    Bluejets

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    Oct 5, 2014
    Given that, best you get local assistance from one who does.
     
  5. kellys_eye

    kellys_eye

    4,289
    1,143
    Jun 25, 2010
    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.
     
  6. dave9

    dave9

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    Mar 5, 2017
    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.
     
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