If your HTC 7 trophy mobile phone volume keys not working then 1st check buttons,
if thy are ok but problem still then make Jumpers red line make jumper
HTC 7 Trophy Volume buttons not working
HTC 7 Trophy Volume buttons problem
HTC 7 Trophy Volume buttons problem solution
HTC 7 Trophy Volume key
http://repairphone24.blogspot.com/2014/12/htc-7-trophy-voluime-keys-jumpers.html[http://repairphone24.blogspot.com/2014/12/htc-7-trophy-voluime-keys-jumpers.html]