Earphone cracked open, noise cancelling makes high pitch sound now.

I tried this and mine are now working perfectly again

https://www.youtube.com/watch?v=JPp12Cnx...

I had the same problem today. I pulled the ear bud apart further to see if there was any exposed wires or other metal parts touching. I’m not sure if just moving it around caused the squealing to stop, but I then held it tightly together to see if in the position everything was in would cause the squealing. Once I verified that it would not I filled the cracks in with super glue and let it dry (10-15 sec). Seems to be working normally now.

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tried isolating cables with no improvement

The air leak in the ear chamber creates this problem. Seal casing with a silicone glue. While in cancellation noise mode, block the ear bud. It will make a shrilling sound. With your other hand, sandwich the casing. The sound will disappear because your ear chamber is air tight.

it's not even charging