Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

[Joztu]

Hello,

Please I need help on how to fix a 2020 MacBook Pro M1 A2338 for which it's keyboard and trackpad aren't working at all

I've done thorough inspection on the board and didn't find any corrosion, checked a few things but since I'm new to MacBook repairs, I'm lost at the moment

System works fine save for the keyboard and trackpad that won't work

Would appreciate any kinda help

[mon2]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

Hi.

1) post pics of the keyboard cable connectors.

2) first check should be to confirm the keyboard cable contacts are clean and the flat fpc cable is firmly inserted inside the typical blade connector. Have not worked with this model but should be a black blade style that you lift most likely from the back side to release or insert the flat cable. Down the latch to secure it.

Check if there is a white topside stripe on this cable.

The cable may be defective and needs to be replaced.

Either way, work on these checks only after power is off and battery connector / screw is removed. Otherwise, power is present on the board and can cause permanent damage.

[Joztu]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

hello, here’s the attached image, checked the cable and it seems to be in good condition

Thanks

[mon2]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

Test with an external keyboard or mouse to see if that works ok. You may require a usb-c hub with usb-A connectors to mate the external keyboard or mouse.

Test with another OS booting from usb media to rule out the OS as a fault.

[rediii]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

is the keyboard working pre os?

[Joztu]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

is the keyboard working pre os?

Not at all

[Joztu]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

Test with an external keyboard or mouse to see if that works ok. You may require a usb-c hub with usb-A connectors to mate the external keyboard or mouse.

Test with another OS booting from usb media to rule out the OS as a fault.

Ive tried external keyboard and Logitech mouse, all works fine, also tried an Apple external mouse, works too but the main keyboard and mouse aren't responsive

[mon2]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

On the cabling, is the trackpad cable separate or with the keyboard?

That is, can you remove the trackpad cable and still test the keyboard? Do not force the removal of the trackpad cable unless it is socketed.

[Joztu]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

On the cabling, is the trackpad cable separate or with the keyboard?

That is, can you remove the trackpad cable and still test the keyboard? Do not force the removal of the trackpad cable unless it is socketed.

Trackpad cable is different from the keypad, tried the option,

tested keyboard alone, no luck, tired trackpad alone, no luck as well, both aren't showing signs of life

meanwhile, no light on the keyboard as well, was trying to trace the backlight voltage of the kbd (maybe reverse engineering, testing all the options available to me), but since I don't even know the voltage I should be looking for, it makes the fix harder, was trying to follow the path of a 2017 MacBook that works fine, but both boards are totally distinct from what I've seen on their schematics

[sayumin]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

Did you remove the trackpad from C case, and check the back of the trackpad?
Is it clear at the back of trackpad?

Keyboard working need KBD_INT_L, I2C_KBD_SDA, and I2C_KBD_SCL, which are come through JT400.

Maybe there is a water damage at the back of the trackpad, which cause the problem.
OR, check the voltage of these three line. normal voltage?

[notmymacbook]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

My daughter's A2338 MBP has the same symptoms--keyboard and trackpad stopped working simultaneously. It sounds like a motherboard failure since both bombed at the same time, IMO. Just wondering what your final outcome was?

I already replaced the trackpad with no luck so it seems futile to spend hours replacing the keyboard if it's the motherboard.

[oxonater]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

Motherboard issue for sure replaced a number of these for failing trackpad and keyboard, however on some instances it has been the top-case as it was telling the machine it was night night time which of course shuts down any ancillary components OXY !

[UngaBungaMacbook]

Re: Help needed: 2020 MacBook Pro M1 A2338 (keyboard and trackpad not working)

you can check the voltages on JT400, do you have PPBUS_AON, IPD_LID_OPEN1v8, if yes it might be issue with some I2C lanes or some logic chips from the other side. Usually for me it has been the trackpad connector issues, either 1 lane is not connected or not getting enable signal