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Thread: Burning smell?

  1. #1
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    Post Burning smell?

    This is sort of off-topic (I do a lot of that kinda posting though).

    I have a couple of monitors here that are emitting a strange phosphorus odor when they run. Is this normal? I've never had one do this before, and they're both rather old/****ed with.

  2. #2
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    ok, it is producing a burning smell but, is it getting very hot or producing smoke, if not then you don't have a problem. sometimes with age and the dust and other debris settling in electric devices you may start to get a fun smell, that is hardly noticable unless you put your nose to the machine and try to smell something... Are you smelling this sent from far away or only when you put your nose by the screen. If you can only smell it from close up then don't worry about it b/c as i said many devices do that (go smell the back of your TV and you shall see).

    but anyway i would not worry yet

  3. #3
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    Several times I've bought new monitors and they've put off a very distinct chemical burning spell.

    Once it was so severe that before we realized what was wrong, but my father and myself were puking. We returned that particular monitor. The replacement for it (and other new monitors we've gotten) had the same smell, but much weaker.

    In all cases, I kept the area well ventilated for a few days and the smell went away. I can only guess that there's some chemical coating on some of the parts put on during the manufacturing process and when you first run the computer, it takes a little while to burn it off.

    My advice: _Ventilation_ and keep it running for a few days. If it's still real bad, I wouldn't use it.
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  4. #4
    Retired Admin Aaron Cake's Avatar
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    Cool

    The insulation on the HV cable from the flyback transformer had broken down and is allowing corona formation. You can wrap the wire in HV tape to try to cure the problem, or replace the flyback (expensive). Another possibility is that the deguassing coil is stuck on. This is really bad, as it forms a short accross 120V. Perhaps the relay is stuck? If you can't fix it, just disconnect the coil as it really isn't that necessary.

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  5. #5
    Bj
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    Just be a bit wary. If they have been "****ed with" they may not have the over voltage shutdown circuit working properly. Basically this means if your HT supply is above it's normal threshold, say 28KV, it will produce dangerous amounts of xray radiation. This has been known to cause the "ozone" burning smell. Be very careful when twidling pots and the like in monitors and TV sets, you could be doing some serious damage to you.....

    But apart from that, Aaron is right, it sounds like your HT cable has broken down, or the flyback has an internal arcing problem. I don't think it would be the deguassing coil, as the load from it would blow the internal fuse after about 30mins usually anyway.

    Just be careful if you play, nasty voltages in there...
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  6. #6
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    I had a monitor die on me at work about a month ago... I was working on some code and the image started twitching and jumping around and then it went black. I checked the VGA cable and everything was fine. About a minute later the monitor started smoking! I quickly unplugged it and tried it again and it wouldn't power on

    I guess that's what I get for getting a cheap off-brand monitor.
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  7. #7
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    Well, the first one (generic 14" VGA) stopped doing it after a couple seconds, so I assume I just jiggled something around in there that I shouldn't have. It's been working fine otherwise. The other one I haven't tried again. I don't think the latter (a 20" Wyse) has had anything done to it. I took a look inside and everything looks like it's where it should be (rather, nothing looks missing or obviously broken), but if it keeps up the smell I may just junk it.

  8. #8
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    I should note that it's not exactly a burning smell, but like I said, kinda phosphorus. Like fireworks, but not as strong.

  9. #9
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    As Aaron stated a corona may be forming due to the deterioration of or missing insulation on the HV lead. Try turning off the lights in the room with the monitor on and see if you see any purplish or bluish light inside the monitor through the vents.

    What you are most likely smelling is ozone given off when HV ionizes the air around the part that's not insulated. Also, there could be arcing inside the case from some of the HV components to the chassis.

    ... or another possiblity is the monitors are just very dirty inside and are making a smell similar to when a gas heater is fired up after not being used for a long time. You might try shooting some "air in a can" inside it to blow out some of the dust. It would be a good idea to do this with the monitor off, too.


    ...just some ideas.


    --Jason
    Jason Johnson
    Yorba Linda, California
    http://www.m2pc.com

    MPC Phase IV - *** PENDING ***

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