Black Screen Power On Chime No External Video Macbook Pro 15 Retina Display Mid 2015

Chosen Solution

I have the startup chime & laptop powers upDo not see icons by shining light on screenBrightness all the way upTwice the screen came up for 2 minutes, then went blackI have done the PRAM/NVRAM & SMC reset many timesI have re-seated the video cable to logic boardI have removed & re-connected hard driveIf the power is low I see the low-battery flashing indicator on screenConnect HDMI to external monitor does not work

Well, that not good ;-{ Your logic board has issues within the PCH logic. You’ll need a new logic board. Depending on which you have it will be the Intergraded (IG) or Discreet Graphics (DG). These are the low end models: IG - MacBook Pro 15" Retina (Mid 2015, Integrated Graphics) 2.5 GHz 16 GB RAM Logic BoardDG - MacBook Pro 15" Retina (Mid 2015, Dual Graphics) 2.5 GHz Logic Board Here’s the guide: MacBook Pro 15" Retina Display Mid 2015 Logic Board Replacement