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Released June 2012 / Core i7 processor with Turbo Boost / Up to 1 GB GDDR5 Video RAM

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How can I tell if my MacBook Pro has a bad display or GPU?

My MacBook Pro Unibody Mid-2012 is having really weird distorted colors. I tried programming the Mac to only use integrated graphics and that issue was still there. Although, when I connected that MacBook Pro to my desktop mac using "Screen Sharing" the display of the MacBook Pro looked perfectly fine on my desktop Mac. Also, some "ghosting" happens on the screen. This is making me think that maybe the display is at fault because if it were the GPU, those distorted colors would show up on the desktop Mac as well, right? Is this a bad display or GPU?

Also, I had to charge this machine with a 60W Magsafe Charger while the computer was powered off because I did not have an 85W Magsafe Charger lying around. When I came back, the computer was on and it was really hot. Could this have caused it?

Update: Computer is now chiming, but the display is no longer working. It's just a black screen. I noticed that when I put a flash light behind where the apple logo is, I can see the screen dimly.

Update 2: From the looks of my research, it looks like my backlight went bad. How can I tell if this is an issue from the actual screen assembly itself or the logic board?

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Using screen sharing doesn't help in testing the screen as the displays data stream goes over the network not through the GPU logic.

What you should try doing here is connecting an external monitor via the Thunderbolt port using a Thunderbolt or mini DisplayPort cable to HDMI or VGA adapter.

It does sound like you have a backlight issue here as well. What worries me is the system overheated we should check the battery here if you have the external display working or can use screen sharing to your MacBook Pro you'll need to install this great app on your MacBook Pro first. CoconutBattery past a screenshot of the main window so we can review things Voeg afbeeldingen toe aan een bestaande vraag

Once we get an idea on the battery we can see what needs fixing.

Update (04/07/2018)

You'll need an Ohm meter to check the fuse. Here's the location:

Block Image

If its good then your displays backlight LED driver is blown, which is just to the left of the fuse.

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The battery appears to be perfectly fine. From the looks of it, it looks like my GPU is fine and that the backlight went bad. Although, how can I tell if it's the display itself or if its the backlight circuit on the logic board?

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@thekingcameron by looking at the external monitor

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So if the screen shows up on the external monitor, I’ll just need to buy a new display? I don’t need to do a board repair or anything?

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No, this is a logic board issue not the display. The chain of events is the power for the backlight LED's is through this logic to the display.

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%#*@ it. Well, I guess I just need to suck it up and take it to the Apple store tomorrow and see what they can do.

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@thekingcameron yes that is the fuse. Now you have to check it for continuity and check if you get power on it when your computer is on. Careful that you do not shorten anything else out. If your fuse is good than you have to troubleshoot the complete backlight circuit. You need the schematic, the board view and a good meter to do that.

Also, check and post some images of your LVDS connector. Looks a bit odd on one of your images. This may not be a straight forward fix or diagnostic....so be prepared.

We should also see if the expert on here @reecee is going to pick this up.

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Cameron Torres zal eeuwig dankbaar zijn.
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