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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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2.5ghz DG card, replaced LCD panel from a 2.8IG card, all are mid 2015

So I attempted an LCD replacement from a mid 2015 BTO integrated graphics card, replacement Lcd was to be installed in my mid 2015 dual graphics card.

All the connections were the same nothing was different, except after powering on the display there is no light, although you can see the desktop folders icons and etc.

Nothing leads me to believe that the display was defective in any way shape or form as it works in the previous machine MBP.

My question is are the displays different for the discrete versus the integrated graphics card?

Of course I did all the necessary resets, SMC PRAM!! Ugg

Otherwise the machine works perfectly on an external display, It also recognizes the retina display but it won’t allow me to adjust the brightness.

Update (12/27/2018)

A small drop from 6”... lol

Display went dead but everything else works.

Update (12/28/2018)

So here’s to images I found I’m not sure of the location of this fuse, The zoomed in image is of my logic board, The other is from a thread I found here.

Any help is greatly appreciated!!

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To start with the display assemblies are the same across the mid 2015 IG & DG models.

Can you tell us a bit more here on why you are replacing the display.

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Hello,

Did you replace the LCD panel, or the entire display assembly?

You could have gotten a defective part, but it could just as easily be a problem with the backlight output on the board (you can blow the backlight fuse if the laptop is on when the connector is removed / inserted).

I would disconnect the battery, remove the LCD cable, check the end for damage, and reinsert it if it looks OK.

If you are comfortable with using a multimeter and probing small things you could check for backlight output voltage.

I wouldn’t attempt this if you are not comfortable however, as it is relativity easy to slip and short something out with the probe tips.

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It was the whole assembly, with the clamshell.

The clamshell I replaced Came from a mid 2015 2.8.

The only difference is 1 had an integrated graphics card and the other discret graphics card.

I’m going to swap it out to a different computer and see if it works on that one.

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From the sounds of it you need to replace the backlight fuse on the logic board and you should be OK, I’m assuming the system was running at the time so the backlight logic was shorted out which is why the backlight is still out with the other display.

I wouldn’t waste the effort swapping the display around again. The display is more likely OK, its the logic board its self that needs repairs.

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No the computer was closed when it fell, It would be nice to know if it was just the fuse, but I’m sure something like that isn’t very easy to fix either.

It sucks because I just had back surgery and now the next few months are going to be pretty boring.

Do you have any links to a DIY fix for the fuse?

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No, you didn't follow, a closed lid is not the same as cold-stone off.

It would be best to get your system to someone with the needed tools and skills to replace the very tiny fuse link.

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I searched the web.

What side of the logic board is the fuse on?

Any DIY projects that outline the details?

I can’t find one!!

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You'll need to get the schematics and board view for your system. Even still this is not always cut and dry. You might have a coil, capacitor or the buck driver chip failure. This will need deeper diagnostics to be sure.

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