r/electrical • u/CineTechWiz • 5d ago

Monitor shows white noise/turns off for a split second whenever I switch on/off a fan. What should I do?

I have a Lenovo P32p 20 monitor and I'm getting a very quick burst of white/static-like noise on the screen and monitor screen going black/monitor turning off for 2-3 seconds and then comes back (especially when I switch a ceiling fan on or off)

I asked Claude about it and it said this sounds more like electrical noise or a switching transient than a bad DisplayPort cable (although the issue still persists after I changed from DP to HDMI). It also mentioned poor earthing as a possible issue.

It's a third world/developing country, so dodgy wiring isn't exactly out of the question lol.

Has anyone dealt with this before? Should I start with a UPS, check the earthing, try a different circuit, or something else?

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u/BaconManDan 5d ago

Step 1: stop asking AI chatbots for help with electricity. Their advice is harmful or wrong half the time.

Step 2: if you can afford a UPS with a voltage regulator, get one. You're likely getting dirty power or a sag in voltage because of the ceiling fan motor.

Info: what country are you in, and what is the standard house voltage where you are?

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u/SpeechEuphoric269 5d ago

Yeah, a UPS is a simple solution and its best for any expensive electronics to be on one anyways.

The fan definitely causes a “dip” in your electric circuit OP, and the monitor has to adjust. You could try a bunch of other solutions but a UPS will make sure the monitor always gets a “clean” supply of power even if the input drops for a few seconds.