Singing monitor?

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Neorichieb1971

B. Jenet's Firstmate
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I've heard a number of descriptions on this one...whiny...whisling...singing... high pitched noise/squeal...changes frequencies all the time & if I rap it on the side of the cabinet, it will stop for awhile, but start up again, so what's my trouble? Wellll.....
Flyback resonation is caused by the flyback being loosened from the ferrite core. There are several things you can do to stop it, but the easiest & what should work for you can be done with the monitor off.

Take a toothpick & look for a separation of the flyback from the ferrite core in the center...most times you will see what appears to be a cardboard tube/sleeve around this & sometimes they are real tight & other times you can see right into it...any place you see that looks like you can start the toothpick into the core to act as a wedge, do so with either end. Once you have it wedged in there you can try your monitor again & if it has stopped resonating, you can power down & snip the excess toothpick off flush with the top of the flyback's sleeve.

If room does not permit this procedure, your only alternative is to remove the flyback & try to wedge the bottom & reinstall. Sometimes just removing & reinstalling without doing anything else, will cure this problem. Repositioning becomes the cure.

Happy Gaming.....
Click to expand...


My Capcom impress does this. Its like a whining high pitched sound that is quite an ear sore. It does not affect the sound of the game itself and is possibly not even coming from the speakers. Its not even consistant.

Anyways, I am having trouble with my monitor that starts shaking violently at the bottom (At the right when in TATE).

Some Italian guy has told me that he had the same problem with his and a Cap kit replacement did not fix it. Can this whiney sound be the cause and will Bobroberts quotation above fix my shuddering monitor?

Its not doing it all the time, but it will do it at some stage during every game. It seems like a sync problem to me. Need help on this one.

If I take it to a TV repair shop, is this something that is familar to them? Will they be able to fix it? What costs are associated with such a fix?


Thanks for your help.
 
ttooddddyy

ttooddddyy

PNG FTW,
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Sounds like you have an inductor (coil or transformer) ringing, it occurs when the ferrite core in a coil for example oscillates, the result of this mechanical oscillation is the anoying high pitch whistle.

Some have said the deflection yoke can cause this, but Ive never experienced that after years of working on TVs and monitors.

On older monitors there are sometimes width and/or line linearity coils which are reknowned for ringing. A fix is to poor a little correction fluid between the core and former, or maybe a little epoxy, it secures the core so it is unable to physically oscillate.

A cap kit is not likely to fix it imho.

What monitor is in this cab.
 
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Neorichieb1971

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The monitor is a Toshiba 9502 I think. It is a 27" (aka 29")


I don't mind the singing sound that much, I was just wondering if the singing sound will cause the symptoms that I am describing where the screen starts to randomly wobble or shudder on the bottom.

From cold, the monitor is usually stable.. it only starts about 5-7 minutes later and will usually only last 10-15 seconds, then it stabilizes again for a while before doing it again. When I bought the cab it did not do it at all.


The picture is pretty good, not as good as my other cabs though. I am thinking it requires a focus adjustment in the back to sharpen it up a bit.
 
ttooddddyy

ttooddddyy

PNG FTW,
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there is a good chance a cap kit would fix the "wobbly picture" problem.

I would try that first and tackle the whistle later.

You could check for poor connections and mounting of inductors at the same time.
 
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Neorichieb1971

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Joined
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Thanks Toddyyy.

I am going to try and fix it within a few weeks. I will let you know how it goes.
 
N

Nightmare Tony

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The whistle is the high frequency oscillator/horiztonal frequency going nutso.

Before even THINKING of working o a monitror, READ UP on safety and handling of monitors. They can have VERY high voltage which stays on for up 5to DAYS. Even a single discharging will NOT knock it out completely (I should know, I was working on a donkey kong cabiunet, discharged the monitor, and 3 minutes later, accidently toughted the anode and got through back against a wall. Its made me VERY monitor shy since then...)

Monitors are DANGEROUS. When in doubt, get someone who knows what they are doing with it. Seriously.
 
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