iMac G3 CRT clicking?

[Findfamiliar]

I recently bought an iMac G3 off of Offerup. The iMac has been occasionally making loud clicking noises that are accompanied by the picture on the CRT either flickering or jumping. How would I get this fixed? Are there any places that would service the CRT on my iMac?


Here's a video:

 

[DeltaMac]

That's probably an analog/video board.

hmm...
HV parts that are more than 20 years old...
Maybe you'll get lucky on that.

 

[MacTech68]

Poor solder joints or bad earthing could cause this.

However, the most common reason on the tray loading iMac is a Flyback transformer intermittently shorting internally. One day, it will short permanently and stops the machine from booting up as the power supply will shut off part way through bootup.