MacBook Pro weird fans, power and keyboard backlight behavior
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.
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.
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:
Resetting SMC and NVRAM doesn’t help.
Reinstalling or restore from Time Machine doesn’t help either.
I guess it’s an SMC or logic board issue. I would be grateful if anyone can help me with diagnosis or repairing. Thanks.
Hi, people. I did get it fixed and it’s not the battery. I guess it’s worth mentioning here.
I was able to find a repair shop in Shenzhen, China. After opening the bottom, the shop took less than one minute to identify the issue. They told me it’s a broken “IO“ but didn’t give me more details.
The part replacement and labor was US$105 in total. The “IO” part was out of stock. I had to wait 2 weeks. Everything’s normal now and after my inspection, it’s not the IO board that was replaced, nor the battery. I wasn’t sure what was replaced.