Chosen Solution
I just replaced the logic board on my sister’s Macbook Pro 15” mid 2015 Retina. Now the left side Control, Option, and Shift keys are not functioning. The keys do not register in the keyboard viewer. The replacement logic board was purchased from iFixit, so I’m assuming it should be fully functional. I’ve tested in safe mode, a new admin profile, and even booting from another MacOS installation on a USB stick.I’ve reset the NVRAM.I’ve reset the SMC (by unplugging the battery and holding the power since the necessary keys do not work).I’ve re-seated the keyboard connector multiple times (and the trackpad connector for good measure). Questions: Is there anything left to try?Which piece of hardware should I be looking at?
The bad Magsafe charger explains why the old board stopped charging, too bad, it was a very expensive charger in the end although the charging circuit could be fixed by a component level repair, that comes cheaper than a replacement. However, I never experienced a keyboard going bad as a side issue of a faulty charging circuit, the problem must be somewhere else. Shift, control, option and power buttons have a double function in a keyboard as they’re connected to the SMC for reset and other system toggles. Unless you had a spill, big or small in the past, or keyboard has gone bad out of the blue, there might be a board SMC issue. I’d try if a SMC reset works as a first thing. As a second step I’d try again your old board to double check there isn’t a keyboard failure. I know it’s a headache but a KB replacement on a retina is a big job and a topcase replacement pretty expensive..investing a couple hours work in troubleshooting seems to me the best option.
The Keyboard is for Replacement. you need to buy New Keyboard.
