Lenovo A850+ had digitalizer problem (different than others issue)

After I not use my Lenovo A850+,I put at cold place because micro usb port totally broke.After I repair micro usb port at shop,the digitalizer acting weird and it got phantom touch and dead spot.

I try something and I realise half of digitalizer only had problem.I guess maybe CPU heating only at top digitalizer (problem is at mid and bottom digitalizer stay cold and not heat up).

I take and use the ligher to burn the digitalizer and it works for me but can hold for about 3 minutes.

Someone,I need buy new device or it has a chance to replace new digitalizer and the problem is gone?
I use this device for playing games,eg:gta sa

Sorry for my terrible english.Super duper bad and making my teacher dizzy.