k300i lcd light dim
 

I got this problem in 2 sets (k300i)
K300i LCD light and charging was ok
but i remove joystick with heatgun
i fixed new joystick
when set power on lcd light is well but after 3 second light dim
battry full but show messege of battry low
but after 10 second show battry full
but light dim every time
now also set not charging
when insert charger in off mode
set on after 2 seconds off on off on off
any one help me
THANKS

First of all clean pcb, if problem still remain just flash the phone. It should help you.
Wish u good luck....