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The March 2015 update of Apple's 13" MacBook Pro Retina Display, model A1502, features fifth-generation Intel Core i5 and i7 processors and introduces the Force Touch trackpad.

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MacBook Pro no backlight after PRAM reset

The MacBook was displaying vertical lines like these:

https://encrypted-tbn0.gstatic.com/image...

The sounds and system were responding normally, even cursor movement caused changes in the vertical lines.

A PRAM reset was performed, after which the display simply stopped working, no backlight. The system can still be accessed through an external monitor.

In the system information, the internal display seems to not be recognized. I tried removing and reinserting the display into the logic board, but it didn't work.

I need to know if the problem is with the display or with the MacBook. If it's with the display, I'll look into whether I can replace it."

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Did you follow this way of resetting the PRAM ?

https://www.macworld.com/article/224955/...

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What happens when you use an external display in clamshell mode? If the external display is working the. The display needs replacing as either the LCD panel is damaged or the T-CON has failed.

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