iPhone 6 logic board is dead. No water damage. Previous owner said that it showed error 4005 when restored however iPhone does not power on nor detect on iTunes. I have disconnected everything except battery (known good). Followed this video on youtube /watch?v=GHw1WX-CC_Y and everything looks good so i'm guessing that the power management unit is fine. No shorts on vcc_main. What should I check for please?
Note: Phone may have been dropped once as there is a really small bend in the frame.