Macbook A1502 with a non-working keyboard and trackpad

syslan

Member
Macbook keyboard and trackpad not working in OSx

A client brought me a Macbook A1502 with a non-working keyboard and trackpad, but when I decided to test them in another OSs (Linux MX and HBCD in my case) and they work perfectly.

I tested them in High Sierra and Big Sur in safe mode but they didn't work.

Another thing that is happening is that the keyboard is not working on pre-boot, meaning that I can't reset the NVRAM, or even use ALT to boot into another OS, I've been using an extenral keyboard this whole time. The only key combination that is working is SHIFT+CONTROL+OPTION to reset the SMC, but I think that it's working becuse the Macbook is off, as soon as I turn it on, nothing works.

Yes, I've already reset the NVRAM with the external keyboard, and re-seated the keyboard flex and trackpad ribbon and still nothing.
 
Last edited:

2informaticos

Administrator
Staff member
Please correct the typo; no need to repeat the post.
You may also post the 820-xxxx board code at same time...
 

2informaticos

Administrator
Staff member
The strange thing is the KB/TP don't work before, nor after login; two different communications are used.
However, check first TPAD_SPI resistors, R4902-04.
Post U4910 voltages, before and after login.
 
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