This isn’t my video, but is exactly how I’ve fixed the issue. Basically, follow this guide to step 9 for just the left ear cup (at first), then skip to step 17 and confirm that the part in step 17 is broken/affected (you can’t see if your pair has the issue until you remove the part). The part won’t be completely broken, but you’ll see an obvious split that has developed due to the swivel action over time. There’s a prescient comment in the info text (beside the italicized i within a circle) that basically predicts this issue. Remove the part, repair it as per the video, and reassemble. Some notes:
All affected units that I have repaired had three amber LED blinks followed by no white upon reset and no amount of “tricks” could overcome this
All units previously developed sporadic issues over time that became progressively more frequent
Cleaning headband connectors, freezing, and resetting while wearing all worked for a brief period of time
(The temporary fixes make perfect sense when you realize how the issue develops over time)
As I previously mentioned, only the left earcup has been affected in the units I’ve seen - not sure if this is always the case
The repair is almost guaranteed to be temporary if the units continue to be swiveled - although no units have been returned to me so far
Disassembly and repair requires specialized screwdrivers and driver bits (screwdrivers will be too long to properly reach some screws), a microscope (the connections are ~0.2mm wide), temperature-controlled soldering iron with a 0.2mm micro soldering tip, 0.2mm repair wire, X-acto knife, solder paste and/or flux and solder
My repair uses a far shorter repair wire than in the video as ongoing flexibility is paramount
Some repair shops and individuals will have this equipment and will be able to carry out the repair, which now takes me about an hour from start to finish, with the majority of time spent micro soldering and testing for electrical shorts
Sincerely hope that this information helps; the units are so good when they work that they become endearing, and I’m gutted when perfectly good electronics have to be thrown away
