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.
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3 commentaires
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).
par Dan
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.
par Sergei Ludwig
Hello, i just installed a logic board on my mac air (from you i think)...it was great for a couple of hours but then downloaded newer os thus began the glitching...i ordered an external wired keyboard as i can’t log in but external devices and mac charger work...also when resetting PRAM works also and mac reboots...will download “the fix” when my keyboard comes and see if this fixes the glitches. Thanx. Bridgett
par Bridgett Bridgett