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Thank you for your information.

So far I haven't found any suspicious electrolytic capacitors.

I heated the Northbridge with a heat gun.
Unfortunately nothing has changed.
The Northbridge has a cooler with a small fan.

I didn't know the abbreviation BGA.
There are so many shortcuts in computers.

I'll search and experiment more later.
(When it's not so cold in my workspace anymore  )

Thank you.