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I have a CRT Monitor that was working properly, a day ago, we had a storm and I didn't notice that I didn't close the door properly (which has the PC next to it),

when I returned I checked if anything in the Room was wet, but nothing was wet at all (everything was just cold, I suspect humidity),

but then I opened the PC and noticed that the Monitor (it has holes in its outer-skeleton for some reason) is too blurry as if I had a bad eye vision, so I restarted and it got from 100% of bad to 90%, then I left it for like half an hour and it returned to normal but only 80% of the screen's top,

next day I opened it again and same problem, but this time it took less time to return normal (nearly 20 minutes),

also I would like to mention that I've kept using the Degauss functionality multiple times, I feel that it helps to speed up the process

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    Split the problem in two. Can you try another monitor? and does another monitor work? That is half the problem (other half is the computer)
    – anon
    Commented Mar 13, 2020 at 14:44
  • @John can't try another monitor, but noticed now that the monitor has a sound inside of it as if something's moving.
    – Jack Nebula
    Commented Mar 13, 2020 at 14:46
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    To add to John's comment - I wouldn't give this more than 20 minutes of testing. If another screen works, then put the old dear out to grass. A cheap 2nd hand LCD would save you the money in electricity bills inside 6 months.
    – Tetsujin
    Commented Mar 13, 2020 at 14:46
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    "the monitor has a sound inside of it as if something's moving" Coils for sweeping the beam across (horizontal sweep) and up/down (vertical sweep) have likely loosened and are vibrating and screwing up the sweep accuracy
    – anon
    Commented Mar 13, 2020 at 15:08
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    BTW, holes are for ventilation. CRT's use vacuum-tube (valve) technology, with heated filaments.
    – DrMoishe Pippik
    Commented Mar 13, 2020 at 15:27

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