You locked the issue down! Yes, your logic board has a problem! The retina series have a more complex display logic than the older unibody systems or even the newer USB-C systems.
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Unlike the older 2012 which only had one mini DisplayPort to switch the display output either extending your desktop or mirroring. The retina series have two Thunderbolt ports as well as a HDMI port and to add to this each TB port can support two independent images extending your desktop times two and the HDMI can also mirror! All this switching and muxing off of the graphics is a lot of work and we still have two versions of graphics the intergraded Intel CPU graphics engine and if you bought the dual graphics (dedicated) model you have even more complexity!
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Unlike the older unibody 2012 which only had one mini DisplayPort to switch the display output either extending your desktop or mirroring. The retina series have two Thunderbolt ports as well as a HDMI port and to add to this each TB port can support two independent images extending your desktop times two and the HDMI can also mirror!
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As you are able to get the display to operatically work is a good sign as you logic board is repairable! Someone with deeper skills and the needed tools/parts can fix your logic board!
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All this switching and muxing off of the graphics signal feed is a lot of work and we still have two graphics systems! The intergraded Intel CPU graphics engine and the dedicated GPU you have even more complexity!
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The other option is just replacing your logic board [https://www.ifixit.com/Guide/MacBook+Pro+15-Inch+Retina+Display+Early+2013+Logic+Board+Replacement/17052]. While expensive it is the easier way and depending where you live it might be your only option.
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As you are able to get the display to work sporadically it’s a good sign as you logic board is repairable! Someone with deeper skills and the needed tools/parts can fix your logic board! Apple won’t do that, people like Louis Rossmann in NY could.
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The other option is just replacing your logic board [guide|17052]. While expensive it is the easier way and depending where you live it might be your only option. Its not overly hard as long as you have the needed tools and a good work area.
You locked the issue down! Yes, your logic board has a problem! The retina series have a more complex display logic than the older unibody systems or even the newer USB-C systems.
Unlike the older 2012 which only had one mini DisplayPort to switch the display output either extending your desktop or mirroring. The retina series have two Thunderbolt ports as well as a HDMI port and to add to this each TB port can support two independent images extending your desktop times two and the HDMI can also mirror! All this switching and muxing off of the graphics is a lot of work and we still have two versions of graphics the intergraded Intel CPU graphics engine and if you bought the dual graphics (dedicated) model you have even more complexity!
-
As you are able to get the display to operatically work is a good sign as you logic board is repairable! Someone with deeper skills and the needed tools/parts can fix your logic board! The other option is just replacing your logic board. While expensive it is the easier way.
+
As you are able to get the display to operatically work is a good sign as you logic board is repairable! Someone with deeper skills and the needed tools/parts can fix your logic board!
+
+
The other option is just replacing your logic board [https://www.ifixit.com/Guide/MacBook+Pro+15-Inch+Retina+Display+Early+2013+Logic+Board+Replacement/17052]. While expensive it is the easier way and depending where you live it might be your only option.
You locked the issue down! Yes, your logic board has a problem! The retina series have a more complex display logic than the older unibody systems or even the newer USB-C systems.
Unlike the older 2012 which only had one mini DisplayPort to switch the display output either extending your desktop or mirroring. The retina series have two Thunderbolt ports as well as a HDMI port and to add to this each TB port can support two independent images extending your desktop times two and the HDMI can also mirror! All this switching and muxing off of the graphics is a lot of work and we still have two versions of graphics the intergraded Intel CPU graphics engine and if you bought the dual graphics (dedicated) model you have even more complexity!
As you are able to get the display to operatically work is a good sign as you logic board is repairable! Someone with deeper skills and the needed tools/parts can fix your logic board! The other option is just replacing your logic board. While expensive it is the easier way.