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2.0GHz, 2.3GHz, or 2.6GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.8GHz) with 6MB shared L3 cache.

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It does not turn on unless I hold power down for about 5-8 seconds

If I open the laptop and physically unplug the battery and I start with only the power adaptor, it works. Otherwise, I need to keep the button down for 6 seconds. But! The kernel_task uses 400% CPU and the laptop is very slow.

The onboard diagnostic that returns "No issues found. ADP000".

iStat stays that the battery is always using 18.2A (Charger BMON - I think it is SMC register IB0R).

The board does not have noticeable water damage. I started measuring voltages on the logic board but I need some help. I would be able to substitute a resistor or a capacitor, maybe even an IC if necessary.

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help us with some more details like battery is not charging laptop is starting slowley or its too much slow

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Battery charges fine. Only when the battery connector is connected on the board the laptop is super slow. Otherwise it works fine. I think the SMC thinks that there is really a 18.2A current from the battery and it slow everything down to prevent damages.

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Did you have a liquid spill or sit your system down on a wet surface?

While diagnostics is useful it has its limits! If you understand digital electronics we use the term inner-world and outer-world. Diagnostics is mostly limited to inner-world conditions. So analog devices or power being outer-world are just not tested. It also won’t test OS or application issues.

‘kernel_task uses 400% CPU’ tends to be a software level issue. What happens when you boot up under an external bootable drive?

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I reinstalled from scratch. I still have the same problem. Alt-R also load very slow (animations are super slow).

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Re "‘kernel_task uses 400% CPU’ tends to be a software level issue."

Weird. All what I read say that it is usually a hardware issue detected from the SMC.

I do not remember any liquid spills. It I had any in the past, I cleaned them up quickly and I did not have problem for a while. Looking at the board, I cannot see any clear signs of spills on both sides.

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Ralph Fix will be eternally grateful.
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