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Not able to left click. Firmware issue?

I have a Late 2013 15” MacBook Pro that won’t left click. Right clicking works just fine. Note that the physical clicking movement works fineThis happened randomly about a year ago. After getting a $500 estimate from several different places to replace the top case, I put it in a cupboard and got a new MacBook.

Fast forward to today… I’m bored. I picked up a new top case on eBay and installed it myself. But now, the issue persists.

The weird throng about this is I can’t left click with anything. External USB mouse, external Bluetooth mouse, nothing.

Ive noticed that it I can left click with an external mouse in the boot menu but only sometimes with the internal trackpad.

The other weird thing is if I disconnect the trackpad cable from the logic board, I can use an external mouse with no issues.

I suppose its possible both top cases have the same issue but I find that unlikely.


Here are the things I’ve tried:

Resetting SMC

Installing a new SSD

Re-installing MacOS

Installing all available updates


Can this be a firmware issue? If so, how can I fixit it?

Thanks in advance!

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I think your real issue is a messed up Trackpad cable I would have replaced that alone 15” Macbook Pro retina Trackpad Cable, Apple P/N 821-1904 or the full Trackpad MacBook Pro 15" Retina (Late 2013-Mid 2014) Trackpad

This is not a logic board firmware issue.

MacBook Pro 15" Retina (Late 2013-Mid 2014) Trackpad Image

Product

MacBook Pro 15" Retina (Late 2013-Mid 2014) Trackpad

$69.99

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2 Comments:

So you think both top cases have the same issue?

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The uppercase typically doesn't come with the Battery, Trackpad cable or the Trackpad its self as a proper Apple part. As an example 15" MacBook Pro retina Top Case & Keyboard

If your's came with a trackpad I would swap out your original trackpad over. to see what it does then. There is firmware within the chip thats on the trackpad cable which maybe your issue.

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