SCREECHING NOISE - SONY WH-1000XM4 - Can I FIX them?

Hi, in this 'Tea Break Fix' video I attempt to fix 2 sets of SONY WH-1000XM4 Noise Cancelling Headphones that make a high pitched screeching sound. These are expensive well loved headphones, but unfortunately they have developed a fault. They were part of an Amazon returns package and both pairs have the same issue. Are they fixable? Let's find out. If you would like to support these videos, please click here   / mymatevince   Remember that this is just for entertainment and I am not an expert in these repairs. The processes in the video may not be the best way, the correct way or the safest way to fix these things. I do love fault finding and trying to fix broken things, so I hope that comes across in this 'Trying to FIX' series. Many thanks, Vince.