My Volume Button Stopped Working It Will Only Go Down Not Up

I had the same issue. I had to actually take apart the headphone to turn it up. If you can get the up/down switch out, there's a small button underneath to turn it up. Then leave the switch out so you don't accidently turn it down again. Not a good solution, but the only one i came up with.

I had the same problem.  The volume up button has stuck or the entire volume up switch has broken off main board when pressed too hard (what happened in my case).

Take thin bladed pocket knife and pop out volume toggle button.  If switch has broken off then take a flat piece of metal or small flat head screw driver and complete the circuit (touch the two white/grey rectacles on either side of the gold place where the switch used to be attached) while headphones are on so you can hear volume going up.  When turned up all the way, take a dremel tool and grind away the button on the piece you popped out, that contacts the volume down switch so that it won't happen again.  Now pop in the toggle button so it looks complete.  

Fixed!