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Current version by: Starry Chiu ,

Title:

MacBook Pro weird fans, power and keyboard backlight behavior

Text:

So I have been using this laptop for around 6 years. This one evening I opened the lid and it did not wake from sleep. I pressed the keyboard several times but it did not have any responses.[br]responses.
So I have been using this laptop for around 6 years. This one evening I opened the lid and it did not wake from sleep. I pressed the keyboard several times but it did not have any responses.[br]responses.
 
And I long pressed the power button to do a hard shutdown. Then I managed to power it on by short pressed the power button again. However I heard fan running at full speed constantly. The keyboard backlight wasn’t on and overall system performance was about 50% slower than usual. In Activity Monitor I saw nothing using much of the CPU.
 
I reset the SMC and NVRAM and solved the issue. But after a few days I noticed that when closed the lid it puts the laptop to shutdown,as I had to press the power button after opening the lid to use it. And I saw the login screen instead of the lock screen.
 
At that point, resetting the SMC and NVRAM won’t help. It gets worse after a few days:
 
Its fans run at full speed all the time.[br]time.
Its fans run at full speed all the time.[br]time.
 
Keyboard backlight doesn’t work and does not have related options in System Preferences.
 
I see a noticeable impact on system performance.
 
Closing the lid does not put it to sleep (the Apple logo still glows)
 
When not using I have to power it off. And I can only power it on by long press the power button for 5 seconds and a short press on power button.
 
coconutBattery shows abnormal battery info:
 
[image|1787452]
 
Resetting SMC and NVRAM doesn’t help.
 
Reinstalling or restore from Time Machine doesn’t help either.
 
[br]
 
 
I guess it’s an SMC or logic board issue. I would be grateful if anyone can help me with diagnosis or repairing. Thanks.

Device:

MacBook Pro 13" Retina Display Late 2012

Status:

open

Original post by: Starry Chiu ,

Title:

MacBook Pro weird fans, power and keyboard backlight behavior

Text:

So I have been using this laptop for around 6 years. This one evening I opened the lid and it did not wake from sleep. I pressed the keyboard several times but it did not have any responses.[br]

And I long pressed the power button to do a hard shutdown. Then I managed to power it on by short pressed the power button again. However I heard fan running at full speed constantly. The keyboard backlight wasn’t on and overall system performance was about 50% slower than usual. In Activity Monitor I saw nothing using much of the CPU.

I reset the SMC and NVRAM and solved the issue. But after a few days I noticed that when closed the lid it puts the laptop to shutdown,as I had to press the power button after opening the lid to use it. And I saw the login screen instead of the lock screen.

At that point, resetting the SMC and NVRAM won’t help. It gets worse after a few days:

Its fans run at full speed all the time.[br]

Keyboard backlight doesn’t work and does not have related options in System Preferences.

I see a noticeable impact on system performance.

Closing the lid does not put it to sleep (the Apple logo still glows)

When not using I have to power it off. And I can only power it on by long press the power button for 5 seconds and a short press on power button.

Resetting SMC and NVRAM doesn’t help.

Reinstalling or restore from Time Machine doesn’t help either.

[br]

I guess it’s an SMC or logic board issue. I would be grateful if anyone can help me with diagnosis or repairing. Thanks.

Device:

MacBook Pro 13" Retina Display Late 2012

Status:

open