Unhappy [Q] Capacitive buttons are not working ?

I have HTC One X+ 64gb Telus which is rooted,s-off and boot loader unlocked. I am using Elegancia 6.2.0. I don't know what happened to it. Suddenly Capacitive buttons are not working as light are working. In past it never dropped and I Nevar sit on it. I don't know why it happened. Now i am using LMT launcher from which I am not satisfied and thinking about repairing it. In my city there are no HTC service center but there is a collection point(I don't know what it is??? ) . I searched about this on Internet and found that it may be problem of Digitizer. So, My questions are:

1. By replacing LCD+Digitizer would solve this problem? If yes, then which variant should I buy SHARP or SONY version? As mine is Telus version.
2. Should I go to Collection Point in my city ?
3. Or should I take risk of doing dis-assembly of it ?
4. Or Should I buy a LCD+Digitizer from internet and do replacement by local mobile repairs?

PS: I bought it 2 months ago from ebay and it doesn't have manufacturer warranty. And sorry for my bad english

MY WORKS -
u-nexia | power unleashed [ROM] micromax ninja a87
Boot sound and animation in MICROMAX ninja a87
[Patch] WiFi error/bug fixed in MICROMAX ninja a87



SIGMATEL(CHINA PHONE) > Samsung GTS-3370(CORBY 3G) > Micromax A87(NINJA 4) > HTC SENSATION XE(LOST) > HTC ONE X PLUS(TELUS)