Quoted from Cserold:
Screwed around with the TV coil today. Bent the brackets so that the coil was nice and snug. Verified that coil does NOT make sound when firing from the diagnostics. Listen to the God awful sound this thing makes: » YouTube video
Here are pics of the coil. Couldn't figure out how to get the plunger out of the coil or remove the coil from the bracket. Can anybody tell if the plunger is in upside down or not?
Was able to fix the loud buzzing sound when the ball is exiting from behind the TV on the upper play field. Updating to latest code didn't solve or reduce the intensity of the sound. Also, the plunger was not in upside down (this was the issue for several others with same problem). As many thought, it was all from vibration from the coil inside the metal bracket that is welded to the TV.
Here is what I did to fix it:
- Put a piece of this foam (http://www.marcospecialties.com/pinball-parts/626-5078-00) between the top of the coil and the metal bracket
- wrapped a zip tie around the entire metal bracket holding the coil and cinched it down as tight as a could to prevent the coil from future bending
- hand tightened all the screws attaching the bracket to the TV and the screws attaching the TV to the UPF.
There is no audible sound occurring now. Thanks for all the input and suggestions and hopefully this helps others with this problem.