HTC One - near impossible PHONE to fix! :(
"While the display can be lifted, it can't be removed without first disconnecting the display ribbon cables, which are routed underneath the case assembly," said Miroslav Djuric, iFixit's chief information architect. Once the display is removed, the next step is to pull out the motherboard assembly, which is attached to the rear shell of the One. IFixit calls this an "arduous and daunting task."