iPhone 6 has no power
I have an iPhone 6 with no power. Not sure what's the issue with it. I tried to hard reset it (Power/home) and got no response. I tried getting it to be seen in iTunes and or DFU mode and nothing. I've let it charge with multiple different cables for 1 hour+. I opened it and it has no signs of water damage nor tampering. Any ideas?
Update: replaced original battery and the motherboard heated up but screen didn't turn on and didn't sense in iTunes.
Max S さんによる