This display was never designed to be opened for repair, even Sony itself doesnt open it to repair it...they just replace it 100%. The only way to get it open, is to break it open...which is neither clean or neat. It also means that you will probibly break the display even more.
Sony does not support repair questions from consumers for home electronics. SONY just BARELY supplies support for Vendors, and none of it very technical. All Sony will tell you is to take it to a authorised service center, where they will charge you about 60% of the units overall price to repair.
The best way to fix devices like this, is to watch EBay for the same unit, that isnt working, but in a different way than yours isnt working. Use the unit to scalp parts from, although small, compact items like Cameras are VERY VERY difficult to repair...or even open without a LOT of experience.