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Monitor is SNAPPING!

I've had a Sylvania F90 19" monitor for about 5 or 6 years now, without any problems until this past month. Occasionally, a loud SNAP will will come from the monitor, and the screen will "jump" at the same time. Lately, the snapping sound has become very frequent, sometimes happening 7 or 8 times in quick succession! When this happens, I shut down the computer ASAP.
I asked a friend about this, and he suggested that I take the cover off and blow the dirt out. I removed the plastic cover and used some compressed air, but did not try to remove the metal shielding covering the components (and I won't remove it!). My friend said that a part might be going bad inside the unit.

Does anyone have any idea what might be happening to my monitor? I'd like to have some idea what is going on before I cart it off to a repair shop with no knowledge of the possibilites before I take it there.

Thank you in advance!

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Monitors can KILL you!

In reply to: Monitor is SNAPPING!

First, I must write that LETHAL VOLTAGES exist in the monitor years aften being unplugged.

If you go inside and kill yourself, you were warned and can't complain to me about it. (Love that sentance!)


The issue of arcing in TeleVisions (TVs) has been around for decades. It's usually as you suspect the buildup of dust or some conductive path that breaks down once in awhile. A good TV shop tech would know where to look and could clean the path up to give the TV/Monitor a few more months of service. But once the arcing starts, the pathways are laid down and the carbon that is deposited sets the eventual failure into an inevitable event.

Best of luck,

Be safe,


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A Wild Guess

In reply to: Monitor is SNAPPING!

Since the flyback transformer produces about 30,000 volts to charge your crt face to direct the guns electron flow, that may be the problem. The flyback is coupled to the CRT by a thick insulated wire attached by a clip to a hole cast in the CRT. Sometimes the insulation breaks down on this thick wire due to heat and cracks in the insulation causes the voltage to jump to a nearby ground, or follows a dust trail to ground. Disassembly of the chasis to get to the wire and replace or re-coat maybe the answer. Warning, there is many capacitors that charge up and retain the voltage long after the set is shut down and will cause pain if touched. proper discharging of the set must be done before working on it.

A leaky capacitor can also cause the same snap, as well as the flyback transformer itself, so ther are quite a few posibilities. Generally a shop test will cost from 75-100 bucks with a replacement of the flyback at 80 bucks so you are looking at a possible 200 buck repair. Used 19in monitors in fair condition are selling at shows for aroud 100 bucks.


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Re: Monitor is SNAPPING!

In reply to: Monitor is SNAPPING!

Since, it seems to work after the snapping, I *think* your wire from the tube to the HV pot has leaked(its the wire coming from the top of the tube, usually red in color(sparkplug size)). What that means is the wire covering has broken down and the voltage literally jumps to the nearest contact, not good. Check for "tracking" a telltale sign sign of discharges and/or discolored wire with a small hole. This is serious stuff and while you can inspect it, I thought you could fix it w/o possible harm. That voltage is stored for a llllllooooonnnnnggg time and takes awhile to discharge after power off. -OR- a componet on the monitor bd. is breaking down. In either case, repair or replace is your choice. If any warranty, use it.

Blowing out dust may help as dust cruds can allow a path for discharges or shorts to develope. The voltages are in the 50,000+ range, so all due care.

good luck -----Willy

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