"Disposable" laptop HP 250 G5 50% throttling even in idle mode, how to treat?

Question

laptops

The problem is the following.
We bought a laptop HP 250 G5
OS win8.1, Hard drive - 128GB flash, 4GB RAM.
Slowed down, but you can live.
Next to the laptop, a cup of boiling water "exploded" (there was no sugar, maximum tea leaves).
It flooded pretty well. The case is out of warranty, so I broke all the seals and unscrewed the case.
Soaked as much as possible, allowed to dry.
Enabled. Can't see hard.
Ok, got it. He took off the hard one, everything seems to be dry. I removed the adapter board (or controller?). There is water. Ok, dried, collected, earned.
But strong brakes began.
The first suspicions were on the disk, repeated disassembly did not give anything.
I noticed that online video slows down the most, while disk io is not particularly noticeable in the task manager. Began to sin on percent. Installed AIDA64. Aida shows that even in idle time we have up to 50% throttling.
I assume that the cooler is dead. I understand.
I can't find a cooler. It appears to be fanless.
I change the thermal paste out of grief. Doesn't help of course.
According to Aida, the temperature is 40-44, throttling is from 40 to 100%.
Forty degrees for throttling is not enough, of course, but it seems like Hades does not see the most accurate sensor.
In which direction to dig at least?
With grief, I think I will upgrade to win10 and new drivers, update the BIOS, but I don’t really believe that it will help. After all, everything was ok before the flood. It did not differ in high speed, but the laptop was taken so that the wife could give lessons to foreigners on Skype and work with documents, and he more than coped with this, and now the Skype video is turning into a slideshow.

Answer 1

Once water gets into it, anything can happen to it. Maybe the conductive paths have oxidized and more resistance has appeared, or maybe something else. Now it’s either guessing or taking it to a service center and repairing it for $$$