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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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Is this a failing GPU?

Please check the photo below.

Is this a failing GPU?

If so, this kind of fault seems rare on those Retina 13-inch 2015.

I tried to plug an external monitor, and it shows plain grey, nothing else on screen.

Would that be solved by reballing?

How can I go about this?

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A1502 never fails for Video. This issue is a screen issue. If the external monitor shows plain grey could be that is asking for the password or your thunderbolt id dirty.

in case your logic board is defective could be a filter communicating pch with screen or just water damaged. take it to someone that can do a quick check.

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Yes, your logic board has died. Sadly, your system does not have dual GPU’s. The Intel CPU has it incorporated within it.

Time for a new logic board sorry ;-{

Here's the IFIXIT guide you’ll need to follow: MacBook Pro 13" Retina Display Early 2015 Logic Board Replacement within the guide you’ll find the possible replacement logic boards.

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if you get it reballed would it work? how does it fail?

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Same here today. After 1-2 Minutes the Display of my A1502 shows only cryptic artefacts. Could reballing of GPU will fix this problem?

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This is a RAM issue it can be fixed.

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