CRT PC Monitor image shaking

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rascard2007

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Feb 12, 2013
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Hi, I´m new in town, so I want to say thanks to alñl the people to take his time to help the others.

I have a 17" CRT monitor branded as Haier (el cheapo, I think) tha was working fine, but from a few days on the image starts to shake horizontally (i think) so the monitor is almost imposible to be read, even the "NO SIGNAL" banner is shaking so I think it has to be something inside the monitor.

I´ve surfing the web and found a reference about something called ´X-mas tree effect´ but no other reference or explanation about how to solve it.

so I need any clue about how to solve this problem or at least where I can look inside the monitor or what component I must check

many thanks in advance

SAMH
 
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Third vote for moving on. There is just too much risk poking around inside a CRT.

I can't find anything regarding a CRT and the Christmas Tree Effect, but I can say that poking around the monitor's guts will figuratively light YOU up like a Christmas Tree.

In reality it's not that dramatic, you might get a shower of sparks, but most of the time it's a loud bang, like a gunshot, and then you're dead, dying, or wishing for the former. Low end estimates are the tube carrying 20 thousand volts in capacitance for hours or days, or even longer depending on how well isolated it is.

If you can find a H-hold trimmer, use a plastic flathead if you have it, or something insulated, and only if it has a hole in the case to access it, as you...
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kanewolf

kanewolf

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May 29, 2013
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You will need a complete schematic, a digital volt meter, a soldering station, and maybe an oscilloscope to really troubleshoot a problem like this.... There is also the chance of a nice electrical shock inside a CRT cabinet. Fixing a CRT isn't something most people are equipped to do. A different monitor is the SAFE and probably more reliable route.
 
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hunter315

hunter315

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May 12, 2009
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Ever worked on high voltage electronics before? Are you going to have a friend with you in case you poke wrong and get nailed?

If the answer to either of those questions is no, do NOT open that monitor. CRTs have a large high voltage capacitor in them that feeds the tube, in many it does not discharge within a reasonable amount of time(days) so there is a fair amount of risk in working in it if you don't know what is what and how to safely discharge that capacitor.


The safe place to start is to look for a V-hold and H-hold knob on the monitor, it sounds like your vertical and horizontal holds may not be right anymore which results in the image rolling across the screen strangely. If those can't fix it, then its just time to drop $100 and move up to the year 2000 and get an LCD screen.
 
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Saberus

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Aug 23, 2013
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Third vote for moving on. There is just too much risk poking around inside a CRT.

I can't find anything regarding a CRT and the Christmas Tree Effect, but I can say that poking around the monitor's guts will figuratively light YOU up like a Christmas Tree.

In reality it's not that dramatic, you might get a shower of sparks, but most of the time it's a loud bang, like a gunshot, and then you're dead, dying, or wishing for the former. Low end estimates are the tube carrying 20 thousand volts in capacitance for hours or days, or even longer depending on how well isolated it is.

If you can find a H-hold trimmer, use a plastic flathead if you have it, or something insulated, and only if it has a hole in the case to access it, as you need to have the monitor on to properly adjust. If you have to get the case off to reach the h-hold, it's better to find a professional if you can. But the cost of the repair might be close to the cost of a new flat panel that has comparable size, resolution, and refresh rates.
 
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