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.