Question about ViewSonic P225f (Beige) 22" CRT Monitor

1 Answer

Viewsonic P225f CRT - clicking "short circuit" sound, shrinks and expands

WARNING: This is a fairly obscure problem.

I have a Viewsonic P225f CRT monitor, the 22" version. The model number is VCDTS22074-1M. The manufacture date was April 2002.

Conditions: The monitor is on. At any resolution, and any vertical refresh rate, this problem is currently present. It is somewhat sporadic, that is, the monitor can go for a while without having this happen to it. Through my own research, it may be caused by "dirty" electricity(I am currently renting in a very old house).

Possible Related Problem:
http://sci.tech-archive.net/Archive/sci.electronics.repair/2005-09/msg01772.html

Problem: Basically, when the monitor is on, I hear a distinct "sparking" or "short-circuiting" sound. The CRT continually turns/clicks and shrinks and expands at a very irregular, almost random, rate. It does it even when turning on or off, now, as well. Sometimes it displays a clean, perfect picture for 10 minutes before doing it once or twice, and then it doesn't happen again for 20 minutes. Other times, like right now, it keeps clicking every second or two.

It is very possible that this is due to dust build-up in within the monitor itself, as I purchased this from a man who stored it in his garage for some time. I will try the air compressor and edit this post to see if that fixes my problem.

If you have further knowledge about CRT tech in general, you might know what is going on here. Please fill me in! Thank you.

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  • p1agu3
    p1agu3 Sep 15, 2008

    Hmm. Well, I thoroughly cleaned out the inside of my CRT, and it's still doing the same thing. Dust is likely not causing the issue. After doing more reading, etc, I still don't really have a clue what could be doing this.

    I looked for bad solder joints, but I didn't really see any. It's definitely coming from the back of the monitor, though. I'd just love to see a repair manual for CRT monitors so I can troubleshoot properly. Either way, I'll keep commenting and documenting my findings.


  • p1agu3
    p1agu3 Oct 14, 2008

    It looks like this problem could be due to "dirty" power coming in to the monitor. I've ordered an automatic voltage regulator that works in the same way as a powerstrip; hopefully this will eliminate my problems. I'll post again with an update when I figure it out!

  • p1agu3
    p1agu3 Jan 30, 2009

    UPDATE: I dusted the monitor out and bought an Auto Voltage Regulator from Newegg. Neither fixed the problems, though they seemed to happen less often with the clean power I was sending to the unit.

    It still had the problems, however, and I assumed it was still a problem with the power in this house, so I sold it for $75.

    The person who bought it from me smelled burning and heard a sickening crunch a few days ago when it finally went.

    Problem was never solved...good luck to others with similar frustrations.


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Just on a whim I'd say open er up and dust it out , and look for bad solder joints.

That means get out your soldering gun and have a look around the board.

what you described is "intermitant failure" sparking sounds , that prety much indicates a bad solder joint some place , not dirty power , if you suspect dirty power , you can buy a little UPS voltage regulator 6 outlet , those little things can really do the trick when it comes to dirty power because
they can regulate the voltage ALMOST like a full blown UPS backup unit without the battery.

You sound like a smart person who understands power has to be clean , and you seem to understand that intermitant failure is like performing a ( shock test ) where you actually tap on the
device to see if something is loose.

if something IS loose thats like saying open circuit , so that means get in there and have a look for a bad solder joint , I'll bet dollars to donuts it's a bad solder joint at the plug of the monitor , thats because thats where the point of contact is with the power cable , and we tend to wiggle the power cables on our monitors which causes arcing and sparking , if you get my meaning.

I have every confidence you can trouble shoot this problem with just the simple things I've told you.

Go get em tiger.

Shalom >:D<

Posted on Sep 12, 2008

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