Released October 24, 2011 / 2.2, 2.4, or 2.5 GHz Quad-core Intel Core i7 Processor

250 Questions View all

Built-in Keyboard and Trackpad not Working After Logic Board Swap

Hi, so I have been repairing computers for my family for a while so this is extra frustrating to me. Trying to fix one macbook pro, couldn't tell if it was the keyboard or the logic board, so I removed the logic board and put it in a laptop where everything was working properly (no issues). Was able to turn on the laptop after the logic board swap, and so I put the original logic board back in the known good laptop and thought that would be that, but no the machine had other plans for me...

The keyboard and the trackpad are now not being recognized by the laptop! Connecting a USB mouse and keyboard allows me to log in and see that everything else appears to be fine. However, what is really maddening/puzzling is that on top of the power button still working, I reset the PRAM AND the SMC with the built-in keyboard and in BOTH cases, that worked.

When I did the keyboard combination for resetting the PRAM, the laptop rebooted again, and made the chime a second time, and when I reset the SMC, the battery indicator light briefly flashed a different colour. So, how can the keyboard work for those multiple key combinations but typing one letter at a time does nothing?

Of course I tried reseating the keyboard cable several times, but the trackpad is really puzzling because its connector is just a socket, so it plugs in quite easily. Also, to answer your obvious question, no there appears to be no damage to these connectors, I even looked with a magnifying glass. Only indication I have in OS X that something is amiss is when I go to "Accessibility" in System Preferences and click on keyboard, the top option to use "F1, F2 etc as regular function keys keeps appearing and disappearing every second, alternating back and forth, back and forth.

Other than that, if I use USB keyboard and mouse I can use the laptop normally. Please help, I feel like such an idiot, both of these laptops are out of warranty. Thank you.

Answered! View the answer I have this problem too

Is this a good question?

Score 0

Comments:

Can you fill us in on what the second system is. Some of the models use different keyboards & trackpads so you may not be able to swap out the logic board without also swapping out these as well (assuming they are working).

by

Hi Dan, thanks for trying to help. The other system was a Macbook Pro Late 2011 logic board as well. Just to be clear, the problem that I'm describing above is with the laptop that prior to me doing this, had no problems of any kind.

by

Add a comment
Black Friday
Broken doesn't stand a chance.

1 Answer

Chosen Solution

Sorry for taking a while to get back to you. I had to do some searching. Apple at one time had an internal keyboard & trackpad update which had some keyboard & trackpad improvements sadly I don't seem to find it.

For now lets check what the systems firmware is here: About EFI and SMC firmware updates for Intel-based Mac computers. Make sure your at the level listed or newer.

Can you tell me the keyboard firmware levels between the two systems. Are they the same or different?

Go to About This Mac, then System report. Slide down to USB and click on Apple Internal Keyboard what is both the Product ID & Version?

Was this answer helpful?

Score 2
Add a comment

Add your answer

Sergei Ludwig will be eternally grateful.
View Statistics:

Past 24 Hours: 1

Past 7 Days: 5

Past 30 Days: 27

All Time: 534