Keyboard works only before OS boots, but not after

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MacBook Pro（13 英寸，配备 Retina 显示屏2015 年初期）

2015年3月更新的 13 英寸 MacBook Pro 配备 Retina 显示屏，型号为A1502，采用第五代英特尔酷睿 i5 和 i7 处理器，并配备 Force Touch触控板。

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Alex222 @alex22254662

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发帖于: 2018年4月20日

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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

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

由 Dan 完成的 2018年4月20日

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?

由 Dan 完成的 2018年4月21日

Does this laptop have water damage?

由 Ethan Leroux 完成的 2018年4月21日

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

由 Alex222 完成的 2018年4月21日

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Reece @reecee

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发帖于: 2018年4月20日

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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

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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.

由 Dan 完成的 2018年4月20日

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...

由 Alex222 完成的 2018年4月21日

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

由 Alex222 完成的 2018年4月21日

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.

由 Reece 完成的 2018年4月21日

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).

由 Dan 完成的 2018年4月21日

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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 英寸，配备 Retina 显示屏2015 年初期）

Keyboard works only before OS boots, but not after

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