Dead iPhone 5 but recognized on itunes

hello everyone!

i have dead iphone 5

but it recognized when i conected to itunes on notebook

-it no sound indicator when i charge it but it warm that indicate the battery was charged

- no vibrate when i slide the silent switch button

-i already replace with new lcd screen but still same

-i try restored in DFU mode with itunes, and succesfully restored but nothing happens, the phone still dead

for the last, the battery drain fast in stanby before it was dead

from 80% in the night to 20% in the morning

maybe it have serious problem on hardaware like ic cpu or another?