I put this in a box for many months and pulled it out today and managed to fix it so I thought I should report what was ultimately the problem:
-
There are two circuit boards that sit outside the seals of the cups - the buttons on the lefthand cup and the usb board on the righthand cup. I suspected these were the problem but could never find anything. My final attempt before giving up was to pull the ribbon cables and doublecheck the individual contacts.
+
There are two PCBs that sit outside the main seals of the cups - the buttons on the lefthand cup and the usb board on the righthand cup. I suspected these were the problem but could never find anything. My final attempt before giving up was to pull the ribbon cables and doublecheck the individual contacts.
I did not take a picture however, the two leftmost contacts of the ribbon cable between the main board and the usb board (at the usb board end) were visually (but very subtly) shorted across. A quick scrub with IPA removed the corrosion and when put back together the headphones work perfectly (I am using them as I type this). I ended up with a spare screw which belongs somewhere in my right cup but I am not pulling it apart again to find out where it goes.
Hi,
I put this in a box for many months and pulled it out today and managed to fix it so I thought I should report what was ultimately the problem:
There are two circuit boards that sit outside the seals of the cups - the buttons on the lefthand cup and the usb board on the righthand cup. I suspected these were the problem but could never find anything. My final attempt before giving up was to pull the ribbon cables and doublecheck the individual contacts.
I did not take a picture however, the two leftmost contacts of the ribbon cable between the main board and the usb board (at the usb board end) were visually (but very subtly) shorted across. A quick scrub with IPA removed the corrosion and when put back together the headphones work perfectly (I am using them as I type this). I ended up with a spare screw which belongs somewhere in my right cup but I am not pulling it apart again to find out where it goes.