Joust Monitor - High Pitched Whine

Madaracs

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Wells Gardner 19K4901 - High Pitched Whine

I've got a Wells Gardner 19K4901 which recently had some cap work done to it. The chassis is nice and clean and the monitor is relatively bright and clear.

8312656467_da7bf2bd6d_b.jpg


However, this little puppy:

8312655549_85aff6faf4_b.jpg


The flyback is making noise. It emits a very high pitched whine...she sounds tired and angry. Also, if I apply a little pressure on the focus knob the sound goes away. Anyway, can this part be easily replaced? (not a novice--and pretty good with a soldering iron.) Should I let it go until it dies?
 
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try pushing down on the metal bracket with the M on it.

if the wining stops then you have a loose ferrite core and that is ok.
you will need to secure it back down with a tooth pic or r some non conductive glue.

otherwise if it only does it wile pushing on the focus knob then i would replace the fly.

Peace
Buffett
 
no but i could make one if i had a camera.

what kind of camera do y'all recommend.

i want it to be able to not show the refresh lines of the monitor so i can make other videos as well showing how to adjust colors and wite balance your monitor.

other wise BOB Roberts has a little rite up about it for a G07 fly back but they're all about the same as far as tooth picking them.
i can't find his link but it is there somewhere

Peace
Buffett
 
A noisy flyback is not unusual. It is NOT an indication that there's anything wrong with it, if you replace it with a brand new one you may well find that it does the same thing.
 
try pushing down on the metal bracket with the M on it.

if the wining stops then you have a loose ferrite core and that is ok.
you will need to secure it back down with a tooth pic or r some non conductive glue.

Pushing on the M stopped it. So now I want to figure out how to tighten that ferrite core up...
 
To tighten up a ferrite coil, you could use a Quantum Screwdriver, or a molecular wrench.

Sorry. Those old quantum mechanics jokes creep in from time to time. (Read Science Made Stupid! Learn to make your Own Nuclear Reactor out of a plastic trash can, to heat your hot tub!).

Seriously, non-conductive glue (RTV, allowing time for it to cure / degass to allow it to get rid of the VOCs (volitile organic compounds)) or a non-conductive glue, or wedge it tighter with plastic shim stock from your local hobby shop.

Or a toothpick.
 

Thanks, I discharged the monitor and bent the bracket in the above photo a little bit to apply more pressure and reattached. Everything is working good now. Though I'm pretty sure I need a new flyback.

The 4900s chassis layout isn't that great. The horizontal width coil is in a precarious place on the chassis and is difficult to adjust while the monitor is running, additionally, there is an ever so slight bend/fold in the screen on the right side. I think I read a thread that modessitt has on fixing that so I'm going to read up and order parts.

But for now, Joust is running and that's all I care about. :)
 
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We had a thread over in the Neo forums about the flyback whine. The pics in the tutorials online were pretty bad so I took a new pic and labeled it. Maybe this will help:

2h3pjbm.jpg


Then you just snip the toothpick closer to the flyback once you confirm that the whine (ferrite core resonance) goes away.
 
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