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Model A1502 / 2.6 GHz (Turbo Boost up to 3.1 GHz) or 2.8 GHz (Turbo Boost up to 3.3 GHz) dual-core Intel Core i7 processor with 4MB shared L3 cache.

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Backlight stuck to full brightness

Hello everyone,

I just got a recent issue with my macbook. I went for a ssd swap and everything went fine, except I lost the ssd screw. Somehow in my bag my ssd popped out of its connector and I had to do a hard shutdown when I woke it then got a question mark at boot.

Opened it up, put the ssd back in place (it had badly shifted out), and everything seemed fine, untill I noticed I could not longer adjust brightness and it was stuck to full.

My question is the following : I have some basic soldering equipement and skills and would like to try and fix it myself.

First step is I am going to mesure the resistance on the backlight fuse, but if it had blown i wouldnt have any backlight, am I right ?

If the backlight IC was dead, could it be the problem ?

Or is a more likely culprit the FCP connector data pin that sends backlight intensity change commands ?

I did try both smc and nvram reset to no avail.

Thank in advance for the troubleshooting help.

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What are you using for an SSD here?


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Solução escolhida

You appear to be mixing a lot of things here.

The backlight logic is controlled by the iSight unit. Here’s the connector:

Block Image

More likely the LVDS cable or the logic board connector has an issue. Disconnect the battery and then disconnect the LVDS connector as outlined in MacBook Pro 13" Retina Display Mid 2014 Display Assembly Replacement in Step 11. Take some detailed pics of the logic board connector and the cable ends.

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Hello! Thanks for all these precisions !

It ended well, I just had to do a power cycle ! Unplugged the battery for a bit, purged the juice and when I booted up it was working again, go figure !

Thanks alot !


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