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2.2 GHz (Turbo Boost up to 3.4 GHz), 2.5 GHz (Turbo Boost up to 3.7 GHz), or 2.8 GHz (Turbo Boost up to 4.0 GHz) quad-core Intel Core i7 processor with 6 MB shared L3 cache.

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Black screen, power on chime, no external video

  • I have the startup chime & laptop powers up
  • Do not see icons by shining light on screen
  • Brightness all the way up
  • Twice the screen came up for 2 minutes, then went black
  • I have done the PRAM/NVRAM & SMC reset many times
  • I have re-seated the video cable to logic board
  • I have removed & re-connected hard drive
  • If the power is low I see the low-battery flashing indicator on screen
  • Connect HDMI to external monitor does not work
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What happens when you press the D key do you enter into diagnostics?

Reference: Mac startup key combinations

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

Thank you for responding, same blank/black screen.

- Tried holding down D and starting up: I hear the chime but screen stays black

- Pressed & held D after chime....same result as above

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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:

Here's the guide: MacBook Pro 15" Retina Display Mid 2015 Logic Board Replacement

crwdns2886500:0MacBook Pro 15" Retina (Mid 2015, Dual Graphics) 2.5 GHz Logic Boardcrwdne2886500:0

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MacBook Pro 15" Retina (Mid 2015, Dual Graphics) 2.5 GHz Logic Board

$349.99

crwdns2886500:0MacBook Pro 15" Retina (Mid 2015, Integrated Graphics) 2.5 GHz 16 GB RAM Logic Boardcrwdne2886500:0

crwdns2934075:0crwdne2934075:0

MacBook Pro 15" Retina (Mid 2015, Integrated Graphics) 2.5 GHz 16 GB RAM Logic Board

$299.99

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