I realize your post is a few years old, but I’m posting this because it might help another.
I'm a technician working on a customer computer; and what I’ve found might help you with the overheat issue. The computer is a 15” HP Pavilion Laptop. Model number 15-ba057ca. He reported a problem with the fan running fast and noisy. The fan was replaced but the problem still exists. The computer shuts down and on startup reports a thermal event occurred. I opened it up, replaced the thermal paste (Arctic5) and put the machine back together. It was running but a few hours into doing other maintenance (software updates, malware scan, etc.) the machine shut down on me and when restarted it reported a thermal event again (error code 90).
I don't give up easy. I did some research on the HP site and there were suggestions to update the BIOS. I restarted the machine, went to the hp support site, downloaded the BIOS update and started the install from within WIndows. The machine restarted to do the BIOS update and things were going ok, but about a quarter of the way through, the machine shut down and went to a completely white screen. I left it for a half hour or so, no change. Couldn't shut it off with the power button, so pulled the AC power and battery out to shut it down.
When restarted, it went to a black screen. Thought I had bricked the thing. Did some more research and found that the Windows key, plus V (or B) is a method that might work to restore the BIOS. Didn't seem to work. Left it alone for the night. In the morning, pushed the power button and left it alone for a couple minutes, then the BIOS restore screen came up and it proceeded to restore the BIOS. I thought Great! About 25% of the way through though, the machine shut down and went to a white screen again. Something isn't right. Pulled power and battery again, let it sit for a while then plugged it back in. Powered on, BIOS started to restore a couple minutes later, and failed again at about 22%. At that point I was getting a bit frustrated. I pulled the bottom cover off again, exposing the heat sink/fan/processor and tried a restart. Again, the machine fired up, the BIOS was getting restored, but failed again in the same way. At that point I touched the copper heat sink at the processor, hot as !&&*. A few inches away on the copper tube though, cold! The heat sink isn't conducting heat!
More research and found that this is a common problem with some HP laptops. Search YouTube for HP Laptop Heat Pipe Failure. Apparently there is a liquid in the pipe that works through evaporation/condensation/capillary action to transfer the heat. I've ordered another heat pipe off Ebay, but because I'm Canadian (on a border city), and the border is closed right now due to the Covid epidemic, I can't run across to pick up the part until the border reopens (international shipping, plus brokerage fees is a wallet killer LOL). It will be a month or more to get the part and see if that is in fact my problem with this machine.
I’m wondering how widespread this problem is. Is HP aware of these Heat Pipes failing? Seems to me that this is a manufacturing flaw. A heat pipe, being an enclosed system should never fail, at least not before the actual laptop becomes antique. If this is indeed an engineering/manufacturing flaw HP should be coming forward with free warranty replacment parts at the very least, even if the machine is beyond the standard warranty period.
Just an update: Aug 27. I did receive the replacement heatsink/pipe and put it into the customers machine a couple months ago. I just spoke with the customer and it has been running flawlessly since he got it back.
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