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.

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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.