Screen Wont Turn On, Even with New Screen. Phone got hot.

Hi Guys,

so i got this iPhone 6+ that the screen suddenly gone blank, i thought it was the LCD, so i bought new LCD and place it, but then it's the same, no picture coming out,

when the phone plugged, it vibrate every 5-10s, i know this is the code that telling "LCD is not working"

but i tried another LCD and its the same,

whats more is, when the LCD connector is plugged, it got really warm around the connector area,

any insight on what might have broken here? IC display or?

Thank You in Advance