Re: QC 35-I is Turning On By Itself
As I promised, quick update on the switch fix:
So I removed the old switch slider and spring, used 96% ethyl alcohol to clean the bottom part of the switch left on the PCB (filled it with alcohol, let soak for a few minutes, then used tiny cotton wool balls and a pair of pointy tweezers to clean the contacts, then dried it off using compressed air).
Then I took apart a new switch, put the internals into the old housing on the PCB. Then I put the cover of the new switch on, and noticed it is a bit loose, apparently it is not possible to remove the top cover without bending it slightly, and when putting back this way it won't be as snug as it needs to be. So I removed it again, straightened it using needle-nose pliers and put everything back together. I'm using it for a few days and it is working perfectly. Should it break again, I have some spare switches, so I can repeat this process any time.
So, as I thought, the bottom of the switch is the same, they only changed the top parts to make is more stiff. The above process is not much harder than bending back the prongs as recommended above, and gives perfect results, all you need is to buy a new switch (or maybe 10 if you are in the EU..) from Mouser in the $1-$2 price range + shipping.
Also, it seems there is no point in unsoldering the switch and replacing with a new one, only if you are more comfortable with this than taking the switch apart..
If you are only bending the prongs back without replacing the insides, still be careful with the cover, it needs to be straight. If is it bent even slightly, if will not hold the slider down and the problem will appear again.