I’ve had my S9 Bluetooth headphones for a few years and they have always worked great. A couple days ago the volume down button stopped working. The volume was at it’s maximum setting and when paired with my T-mobile HD2 the phone’s volume doesn’t effect the headphones making them basically unusable.
A quick Google search brought up a bunch of posts about the others who have had this same problem within weeks of purchase. The main cause seems to be perspiration and I have to admit that mine were getting plenty of that when they failed. The S9 headphones are great because you can easily wear them under over the ear headphones when you need to block out noise from a mower or chainsaw while listing to the most recent episode of No Agenda (in the morning). Anyway, in a closed space like that they get plenty of perspiration.
With nothing to lose (don’t try this if yours are under warranty), I dismantled the side of the S9 with the failed button. With a pick or a fingernail remove the rubber piece with the buttons marked on it. It isn’t connected to anything so you can just carefully pull it off.
Once you have that off, you need to remove the screw that holds the headphone to the band. With that done, peel up the flexible circuit that was exposed then you removed the rubber buttons. Then, gently work the earpiece from the band. As you separate the earpiece from the band you will pull the lexible circuit you peeled off through a slot.
Use a pick to gently separate the circuit board from the rest of the earpiece. You should end up with something like the photo above except for that your wire connections will be covered with glue. I used a heat gun and tweezers to remove the glue. My original intent was to expose these to test the failed button’s function by jumping the correct leads to determine if the problem was actually in the flexible button circuit. While removing the glue I discovered that exposed portions of the wires were very close to touching in a couple places. I found that separating these wires fixed my down volume button. You can test this by pinching the correct por3tion of the flexible button circuit and listening for the beep in the earphone. You don’t need to be paired to a phone to test this.
To better insulate the wires I cut a small portion of heat shrink tube and placed it between the rows of wires. If everything is still working, carefully reassemble the S9. Be very careful with the wires that go to the earphone speaker. I managed to pinch one of these the first time I put it back together and it was a real pain to solder it back together.
I’m not sure if this is the same issue that everyone else is having and I have only tested this for about an hour so far so your mileage may vary. If they stop working again I will update this post.