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Monitor turns off for a few seconds when switching on a ceiling fan.

Hello,

So, I have my monitor and computer plugged into a fairly expensive surge protector and whenever I turn on or off the ceiling fan in my room, the monitor turns off for about 2-3 seconds before coming back on. Interestingly enough, this also happens when I turn on the fan in my bathroom as well. What could be causing this, and is there any way to fix this without calling in an electrician who will charge umpteen hundred dollars? Finally, do you think this could be dangerous for my computer?
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More about monitor turns seconds switching ceiling fan
  1. Sound like your having voltage droop and the surge protector is doing its job, sorry to say, only a leccy man can sort this out.
  2. das_stig said:
    Sound like your having voltage droop and the surge protector is doing its job, sorry to say, only a leccy man can sort this out.


    But as far as I can see, the computer isn't having much of an issue and the monitor also does this when plugged into a separate source that is not a surge protector.
  3. The power/wiring in the house is the problem.
  4. Best answer
    You have three possibilities:
    1- the display's PSU is excessively sensitive to electrical noise
    2- your fans are putting out excessive start-up noise
    3- you have an electrical wiring fault such as a weak electrical connection that arcs from surge current your fans draw during start-up or just excessive losses through such a weak connection causing line voltage to dip below the minimum your display needs to stay happy

    A good UPS would be able to tell you if it is switching in due to noise, surges, brownouts and possibly other line voltage issues. If the display can gracefully handle getting switched between battery and line power, that should rule out option #1.
  5. jdotjdot7 said:
    But as far as I can see, the computer isn't having much of an issue

    Your PC's PSU simply has wider tolerances than your display does.
  6. InvalidError said:
    You have three possibilities:
    1- the display's PSU is excessively sensitive to electrical noise
    2- your fans are putting out excessive start-up noise
    3- you have an electrical wiring fault such as a weak electrical connection that arcs from surge current your fans draw during start-up or just excessive losses through such a weak connection causing line voltage to dip below the minimum your display needs to stay happy

    A good UPS would be able to tell you if it is switching in due to noise, surges, brownouts and possibly other line voltage issues. If the display can gracefully handle getting switched between battery and line power, that should rule out option #1.


    I had heard that a UPS might be able to solved the problem, so basically, if that doesn't work, then I'd likely need to get an electrician.
  7. Putting in a UPS doesn't solve the problem, it just smooths out the weirdness.

    The problem is likely the house wiring.
  8. jdotjdot7 said:
    I had heard that a UPS might be able to solved the problem, so basically, if that doesn't work, then I'd likely need to get an electrician.

    An UPS should not be necessary under normal circumstances so if the UPS "works," it proves that your "normal" circumstances are abnormal and should be looked at.

    Your wiring issue could be as simple as a loose connection in one of the electrical boxes between the breaker and your outlet. Usually, power is daisy-chained through and fanned-out from ceiling light boxes. Those should not be too hard to check. If you find a wire nut that has wires with brittle or discolored insulation near them, you probably found your problem - assuming you are comfortable with that level of electrical work and your local code allows trivial DIY jobs like those.
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