THL W8+ gets hot on the back side after falliing down

Hi mit THL w8 felt of the couch. since i cant charge the accu in the phone.
only with a extra charger.. if i use the original charger on the phone it will suck the accu to 0% ..
kinda wierd..

Tryed diffrent charger and accu.. even buyed a new one.

so if i place my (external charged) accu into the phone,

i can start it and use it about 20sec until the back side get really hot (near sim slot 1) and it reboots.

so it looks like something is broken maybe someone got a page for spare parts or
knew the problem to get it fixed

thx
haufe