Looking for some help whit monitor whining noise.

[Nevermore]

Hey everyone.
I just purchase another arcade for my home, the pictur of the monitor is fine but i get a screeching whining noise.
I went and did some research and i found the culprit, i will attach a photo (if i can figure out how to do that 😂).
The arcade was made by a french manufacturer called n.style but for the life of me i cant find the manual pdf.
I already had another arcade monitor die on me and i had to replace it with a lcd monitor until i can find a suitable replacement, so i would hate to lose abother one.
Your help is greatly apriciated 😉😁

[Nevermore]

From what i have been able to deduce, this must be the with coil.
Its connected to a little board in front of it with a adjustment knob for the width.
So i went looking online and saw people mentioning putting a toothpick inbetween the core and the shell to keep it from oscilating.
The only probem i have is that the whole thing is shielded of by a plastic cover.
I tried to genty take of the cover, but it wasnt budging so i gigured to not force it.
I looked to see if i could reach it trough the bottom but i cant.
Does anyone have a idea that could work out?, i kinda bumed.
I kinda got burned on this arcade, but for what its worth i want to give it a second life but the thing really is a tottal hackjob.
If anyone has any toughts pleas let me know, and if you need more info or pictures i am more than willing to provide the info.
Cheers guys

[princess prin prin]

That's the horizontal linearity coil. It has a magnet on top oriented for optimal linearity and glued. You need to desolder and clean the coil as a whole. Then brush some coil varnish on the winding, let it dry, mount the coil back on the chassis and hope the issue has gone or improved.

[Nevermore]

Allright, i could give that a shot.
I never desoldered anything in my life, but i think i have some spare parts laying around that i could do a testrun on.
I think its both soldered to the bottom and to the pod on the board next to it.
I am kinda skiddish when it comes to stuff like this, just dont want to make the problem worse then what i started outh with 😂.

[Nevermore]

That's the horizontal linearity coil. It has a magnet on top oriented for optimal linearity and glued. You need to desolder and clean the coil as a whole. Then brush some coil varnish on the winding, let it dry, mount the coil back on the chassis and hope the issue has gone or improved.

just to dot the i's ans cross the t's, cleaning probably is best done using 90%+ cleaning alcohol correct?.

[princess prin prin]

Two solder points on the bottom. Dry brush it or use a degreaser and water.

[MKFan4Life]

I think you got confused about the toothpick. Correct me if I am wrong, but that was a trick Bob Roberts mentioned once to quieten down "singing" flyback transformers with loose cores isn't it? I have one of those in a K7400 that went down. Got a new flyback for it and need to get that replaced soon. I could put pressure against the flyback with a plastic tool and it would change it's tune, so it makes sense a toothpick shoved underneath at the correct spot might quieten one down a bit.