Astro Nano MS9 high pitch ringing

[Suzuki_Bison]

So the monitor inside my astro is omitting a high-frequency tone. I was working with an arcade-tech friend of mine who thinks it could need a re-cap, or possibly could be a voltage issue, but we're not 100% sure. The ringing seems to change pitch when the flyback is touched or nudged (we were sure to test this safely).
Anyone else ever experienced this before?

 

[rewrite]

If it has screws that mount the flyback to the chassis, try tightening them down a bit. The flyback vibrating can make a god-awful whining sound.

 

[Suzuki_Bison]

Ill definitely look into this!! Also, I have to correct myself that the monitor actually is an MS8-29, not the MS9.

 

[gunblade]

normally a noisy coil down the side of the flyback

 

[Suzuki_Bison]

normally a noisy coil down the side of the flyback

i heard this can be the issue as well, would a cap-kit solve this (planning on recap anyway) or is the coil something totally separate I need to purchase?

 

[gunblade]

i desolder the coil and check if its fully intact then resolder and use a hot glue gun to hold in place using the heatshield as the glue anchor point to the coil- it helps prevent vibration and should quieten the coil down significantly

 

[Suzuki_Bison]

Ill let you know what I find, ordering a cap kit this week!! Thanks again!

 

[stj]

check all large parts or parts bolted to anything for cracked solder joints.