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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Backlight / screen problem

MacBook Pro a1502 - 2015

I have a weird problem.

I replaced a logic board on a MacBook a1502. Year 2015. Problem. Was liquid spill, on the bad board everything would work when plugged in , but it would not work on the battery.

I replaced the logic board , and everything was fine. Few days later Customer dropped laptop while it was on from sofa. Nothing was fiscally broken but the screen went black ,.

It works on a external monitor through HDMI ,

The backlight of the LCD actually comes on, but it only comes on after boot, but no display. During boot cannot see apple logo even if I put light to it.

So, to check if was board or screen I took the old board which was still working ,but only plugged to power, and same problem happened. So I thought screen is bad.

Order new screen assembly, installed it, now I get no backlight at all , I can see apple.logo during boot, the desktop icons and everything but no backlight at all..

Took the old board, installed it ,same problem.

This is driving me nuts, could it be that the bad screen had some kind of short and it actually damaged both boards ?

Or maybe the new screen I got, is a factory defective unit ?

Thanks for any suggestions

Answered! View the answer I have this problem too

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There is a possibility the LCD you received was defective, its is however much more likely that the (I think 2 off the top of my head) cables between the LCD and the Motherboard got pinched or yanked in a way that weakened them enough that the fall the laptop experienced 'finished the job' so to speak.

I would recommend ordering a set of LCD/Backlight cables (they'll probably be pulled out of another laptop, they are exceedingly difficult to find new) and testing the new MB with the new cables and the old LCD.

P.S.

This info comes from going through the same extremely frustrating experience you're experiencing, only I ordered 2x new LCDs and 2x new cable sets before I got it over with

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Thanks for your reply, the problem was actually a bad new LCD I received. I sent it back and order a new one and it worked. This was actually the first time I have received a bad brand new LCD.

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I am Not a Computer Repair Specialist, yet anyways lol but with the help of this site, google, & youtube, I'm sure that i will be soon enough, But aside from that I am a Certified Electrician and just reading your the Synopsis of your problem, I am almost 100% positive that your Diagnosis is a Electrical Short, Find the Short and Replace that component, wire, or connector and your problem is Solved, Good luck, Hope you figure it out, and when you do I would greatly appreciate if you would be able to inform me on what is that you find out, Problem & Solution, Thanks

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Thanks for your reply. the problem was actually a defective LCD I received.

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Daniel Matos will be eternally grateful.
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