Keyboard works only before OS boots, but not after

Question

MacBook Pro 13" Retina Display Early 2015

The March 2015 update of Apple's 13" MacBook Pro Retina Display, model A1502, features fifth-generation Intel Core i5 and i7 processors and introduces the Force Touch trackpad.

1185 Perguntas Visualizar todos

Alex222 @alex22254662

Rep: 275

3

14

Postado: 20 de abr de 2018

Opções

Keyboard works only before OS boots, but not after

The laptop's keyboard responds when I press the power button. It also responds when I press Alt upon startup, to choose the startup disk.

However, it stops being recognised at all time, after the system boots.

Also, the trackpad fails to be recognised at all times: before AND after boot.

What is wrong here?

Is it a hardware problem?

EDIT I cleaned the connectors and here is the result: the keyboard WORKS all the time. But the trackpad never works.

Both external mouse and keyboard work.

However, The trackpad cable should not be to blame because it worked normally with the previous logic board that was in this laptop.

NOTE I just found out both Thunderbolt ports are not recognised, and the wifi card is not working (but Bluetooth works). Don't know if it's linked to the trackpad in any way

Respondido! Ver a resposta Também tenho esse problema

Esta é uma boa pergunta?

Sim Não

Pontuação 0

4 comentários

Do you have a USB keyboard and mouse to try out?

20 de abr de 2018 por Dan

Can you give us some background here on the system. Did you have a liquid spill at some point? Did you bang or drop the system?

21 de abr de 2018 por Dan

Does this laptop have water damage?

21 de abr de 2018 por Ethan Leroux

Haven't found any trace of water. No sticker has been triggered, and no apparent trace on the board

21 de abr de 2018 por Alex222

Adicionar um comentário

1 resposta

Solução escolhida

Reece @reecee

Rep: 34,8 mil

eFix Ltd (UK)

8

52

62

Postado: 20 de abr de 2018

Opções

Most likely the trackpad cable, common failure in this model. If the trackpad is not recognised, only the power button on the keyboard will work when in an OS, no other keys will work.

Try a trackpad cable first, take it from there

Esta resposta foi útil?

Sim Não

Pontuação 3

7 comentários:

You beat me to it ;-}

I was hoping Alex would have verified the external keyboard & mouse worked which then verifies the ribbon cable is bad.

20 de abr de 2018 por Dan

Hi there, thanks for your response. I cleaned the connectors and here is the result: the keyboard WORKS all the time. But the trackpad never works.

Both external mouse and keyboard work.

However, The trackpad cable should not be to blame because it worked normally with the previous logic board that was in this laptop.

Not sure what is wrong here...

21 de abr de 2018 por Alex222

I just found out both Thunderbolt ports are not recognised, and the wifi card is not working (but Bluetooth works). Don't know if it's linked to the trackpad in any way

21 de abr de 2018 por Alex222

Nope, ThunderBolt ports are likely an issue with the circuit or possibly corrosion around the through hole soldering (in which case, the ports will need to be replaced) and the WiFi card has likely failed; sometimes either WiFi or BT can fail and the other function will be working.

21 de abr de 2018 por Reece

I agree with @reecee - Sounds like your environment is very humid so you've got a bit of corrosion damage here (thats if the system didn't get wet some how).

21 de abr de 2018 por Dan

Exibir mais 2 comentários

Adicionar um comentário

Can you give us some background here on the system. Did you have a liquid spill at some point? Did you bang or drop the system? — Dan
Haven't found any trace of water. No sticker has been triggered, and no apparent trace on the board — Alex222
You beat me to it ;-}

I was hoping Alex would have verified the external keyboard & mouse worked which then verifies the ribbon cable is bad. — Dan
Hi there, thanks for your response. I cleaned the connectors and here is the result: the keyboard WORKS all the time. But the trackpad never works.

Both external mouse and keyboard work.

However, The trackpad cable should not be to blame because it worked normally with the previous logic board that was in this laptop.

Not sure what is wrong here... — Alex222
I just found out both Thunderbolt ports are not recognised, and the wifi card is not working (but Bluetooth works). Don't know if it's linked to the trackpad in any way — Alex222
Nope, ThunderBolt ports are likely an issue with the circuit or possibly corrosion around the through hole soldering (in which case, the ports will need to be replaced) and the WiFi card has likely failed; sometimes either WiFi or BT can fail and the other function will be working. — Reece
I agree with @reecee - Sounds like your environment is very humid so you've got a bit of corrosion damage here (thats if the system didn't get wet some how). — Dan

MacBook Pro 13" Retina Display Early 2015

Keyboard works only before OS boots, but not after

1 resposta

Adicionar a sua resposta