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Old 03-27-2012, 11:02 AM   #1
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Monitor Hums While Off.

So, this morning I shut down my PC before work, and after everything was off I noticed a humming/hissing sound. It took a long time to track it down, but eventually I figured out that it was coming from my LCD monitor. When I turned it on again the noise stopped. Turning it off made the sound come back. I unhooked both the VGA and power cables, and the noise was still present.

Does anyone know what could be causing this, and should I be concerned?
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Old 03-27-2012, 11:14 AM   #2
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Gateway monitor?
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Old 03-27-2012, 11:21 AM   #3
PathMaster
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Unplug from power and press, then hold the power button for 20 seconds. Still making the noise?
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Old 03-27-2012, 11:23 AM   #4
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Could be a capacitor not discharging on shutdown. Does the sound go away after a while? Trying pushing the power button with no power cable- that might discharge it. You may have a cap discharging through something it shouldn't. This could be very bad, or nothing at all to worry about. Check for recalls on the model
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Old 03-27-2012, 11:56 AM   #5
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My LG 19' Started to do this. Light hum, that you wouldn't notice until you got really close. So I just physically unplug the power cable when I'm done with the screen
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Old 03-27-2012, 12:03 PM   #6
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Old 03-27-2012, 01:14 PM   #7
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It could be an internal powe supply issue
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Old 03-27-2012, 03:29 PM   #8
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Could be a capacitor not discharging on shutdown. Does the sound go away after a while? Trying pushing the power button with no power cable- that might discharge it. You may have a cap discharging through something it shouldn't. This could be very bad, or nothing at all to worry about. Check for recalls on the model
I unplugged it, then hit the power button, and that made the noise stop. But once I had plugged it back in, turned it on, then turned it off again, the noise had returned.
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Old 03-27-2012, 07:49 PM   #9
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Sounds like it could be a capacitor discharging through something. This is new, right? If it is still under warranty I'd say give the manufacturer a call. Otherwise this could be a sign the monitor is dying. It might last for a long time - but something is not right in there. It probably isn't a safety hazard, but in theory it could be. If I were you I'd keep using it but unplug it when I went away for a few days.
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Old 03-27-2012, 08:14 PM   #10
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It's a couple of years old now, so it's out of warranty, unfortunately. I may call LG about it tomorrow anyway, if I have the time. Thanks for the help!
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Old 04-05-2012, 10:27 PM   #11
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I have an opposite problem, my monitor has an audible hum when it's on. This buzzing noise. I believe it may be a fan, because I smoke in front of it, it probably built up residue.

It has those weird star shaped screws though, so I can't open it to look at it. Plus, I hate cleaning up my PC fans, they're always caked with dark orangish gunk that's pretty much tar caked dust. Blegh. Makes me think of quitting smoking, since my lungs probably look worse. And I can't quit yet, because of a certain situation (long story).
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Old 04-22-2012, 05:26 PM   #12
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Star shaped? Might be torx heads
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Old 04-23-2012, 01:18 PM   #13
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If it's humming, you should teach it to sing.
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Old 04-27-2012, 09:20 PM   #14
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For the time being, put it on a switch and turn off the power when not in use. If it is a capacitance issue, it could lead to a spark if it powers up strangely.
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