If you can arrange T6 or T7 screw driver open the case of the phone carefully.if you are getting panic or afraid than please dont proceed.
materials you required are-
3.spirit/IPA & hair dryer.
4.T6 or T7 screw dryer.
open back case & remove battery,sim card & sd card.
remove all screws mostly 6 nos & keep them safely.
once you have done this try to remove lcd display,keypad carefully.
now take tooth brush & dip it IPA/spirit ans start cleaning pcb.(green colour board).
After 10-15 mins use hair dryer on board in three turns & dont heat up the pcb only warm.
wait for the 30 mins & turn on the phone.
it will work for sure