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Does not boot, black screen, no caps-lock light

MacBook has recently stopped booting, no liquid or impact damage. The trackpad is clickable however the screen remains black and the caps-lock does not light when tapped some minutes after boot. The CPU heats up. Interestingly when connected to another MacBook (Pro) by USB-C (for example to attempt target disk mode) the trackpad is no longer clickable.

I’ve swapped out the uppercase and display to a spare to see if it’s an issue there along with disconnecting the keyboard but the issue persists which suggests to me it’s an issue with the logic board.

Anyone have experience of this before and what might have gone wrong on the logic board?

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What does an external monitor show you (TB3 to HDMI dongle)? If it doesn’t show anything then the logic board has failed.

Update (05/05/2020)

You’ll need to find someone which has the skills to diagnose what has failed on your logic board or just replace it! MacBook 12" Retina (2017) 1.2 GHz Logic Board. Here’s the guide to replace it Retina MacBook 2017 Logic Board Replacement

MacBook 12" Retina (2017) 1.2 GHz Logic Board Image

Product

MacBook 12" Retina (2017) 1.2 GHz Logic Board

$349.99

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Nothing on an external monitor.

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jgarnham will be eternally grateful.
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