So far, i Suspected is Digitizer's pasal la.. but Hair Dryer also can

[But u need the thin hair wire to separate the stupid blardy Digitizer man..

]
And so what i do is,
-go Amazon bought the part
[LCD+Digitizer, which damaged my wallet around MYR 370]
-got your precision screw set

OR
PM abang ECTT's for the tools [which u may find it at garage sales la

]
n
Just remember, when u opening the back cover... use the guitar pick/deplastizer tol opened it..the step is damn
till battery***
u really need care about it,
unscrew the housing den u unscrew whole the rest den
unscrew battery-> den use guitar picks to popped that out {NVR USE SCREW to pop that battery soc coz i damaged the shit battery Sockets w the minus screw n need wait till next Mon go LG KJ repair the shiet :-x ]
and then
popped the rest ...
den replace the heck of the LCD+digitizer
n screw it all the shit n turn on n see
ta-da u r done your job..
but if u wanna replace your digitizer... is quite kind wasted around 45 mins..[20-30 mins to defuse the glue n take away the damaged digitizer; apply 3M digitizer panel (1 kind of the little layer stuff) + the special glue to re-glue the LCD panel, refuse again till around is fully sticked like "magnet pole"

]
den test n see
n another ta-da job for you

whew finally got a time to mess around opening it. i agree the back cover is a pain in the ass to open, always sked the cover will break lol. but whew managed to open it again. (first time open just to look inside)
i managed to get hold of a hairdryer this time. quite hard to pry the battery out but hairdryer does help!
done with that, took out the motherboard cover and tried to detach and attach the digitizer socket. yup confirmed now digitizer problem.