Question Weird CPU temperatures on Acer Nitro ANV15-41

[RubyTheFlareon]

A month ago I've purchased a brand-new Acer Nitro ANV15-41 with Ryzen 7 7735HS. I was very happy with the purchase and it was a smooth ride, until I had to turn it into the service shop for a screen matrix replacement. After said matrix was replaced and I booted my laptop at home and used it for about 5 minutes in a non-resource intensive program (like Word), I heard the coolers spin up wild before it slowed back down about 5 seconds later. After a few of such "bursts" I decided to check the temps in UEFI. 5 seconds after booting, after being in a cold room the temperature shown in UEFI (it said "System temperature", but I assume it is CPU temp.) rapidly rose and capped at 90 celcius. I downloaded OCCT to monitor the temps more closely. After loading ANY program (like browser, Discord, Word or any other app really) the temperature immediately spiked to 87 degrees and died off just as quick back to normal 40-45. Now, a day after that with just my browser with two tabs on the temp in OCCT is persistent at 70-73 degrees. During all these measurements and work with the laptop the CPU load as per the Task Manager never exceeded 25%, neither there were any pressure on RAM (around 40% usage) and GPU (0-20% usage). This really only occurs when the laptop is powered from the network (when working off the battery the temp spikes are insignificant, from 45 to around 55 degrees), although the UEFI says that it's 90 degrees when working both from network and the battery. In my paranoia I checked the laptop innards and everything was sealed, so I don't think that they could have put another faulty CPU in there instead of my new one. Could they have somehow disrupted the power supply when replacing the screen matrix?

 

[Roland Of Gilead]

A month ago I've purchased a brand-new Acer Nitro ANV15-41 with Ryzen 7 7735HS. I was very happy with the purchase and it was a smooth ride, until I had to turn it into the service shop for a screen matrix replacement. After said matrix was replaced and I booted my laptop at home and used it for about 5 minutes in a non-resource intensive program (like Word), I heard the coolers spin up wild before it slowed back down about 5 seconds later. After a few of such "bursts" I decided to check the temps in UEFI. 5 seconds after booting, after being in a cold room the temperature shown in UEFI (it said "System temperature", but I assume it is CPU temp.) rapidly rose and capped at 90 celcius. I downloaded OCCT to monitor the temps more closely. After loading ANY program (like browser, Discord, Word or any other app really) the temperature immediately spiked to 87 degrees and died off just as quick back to normal 40-45. Now, a day after that with just my browser with two tabs on the temp in OCCT is persistent at 70-73 degrees. During all these measurements and work with the laptop the CPU load as per the Task Manager never exceeded 25%, neither there were any pressure on RAM (around 40% usage) and GPU (0-20% usage). This really only occurs when the laptop is powered from the network (when working off the battery the temp spikes are insignificant, from 45 to around 55 degrees), although the UEFI says that it's 90 degrees when working both from network and the battery. In my paranoia I checked the laptop innards and everything was sealed, so I don't think that they could have put another faulty CPU in there instead of my new one. Could they have somehow disrupted the power supply when replacing the screen matrix?

Hey there,

Hmmm. Something smells a little rotten in Denmark here.

If the temps were in check before you let the service team check it, then it's likely something they've done. Was this an Acer repair, or some shop you know that does repairs?

It could be they dislodged the CPU heatpipes or something like that. It wouldn't be possible to switch CPU's as nearly all new laptops have them soldered top the motherboard. I guess it's conceivable they changed that out, but highly unlikely.

It suggests to me, the cooling isn't seated properly, or the cooling pipes/heatsink have been removed and replaced, but without new thermal paste.

It's really hard to know for sure.

 

[RubyTheFlareon]

Hey there,

Hmmm. Something smells a little rotten in Denmark here.

If the temps were in check before you let the service team check it, then it's likely something they've done. Was this an Acer repair, or some shop you know that does repairs?

It could be they dislodged the CPU heatpipes or something like that. It wouldn't be possible to switch CPU's as nearly all new laptops have them soldered top the motherboard. I guess it's conceivable they changed that out, but highly unlikely.

It suggests to me, the cooling isn't seated properly, or the cooling pipes/heatsink have been removed and replaced, but without new thermal paste.

It's really hard to know for sure.

Howdy.

Now that I think of it... When I took the lid off I laid eyes on the heatpipes, they didn't strike me as "brand new". I think they had some scratches and probably patina. I don't really know how they are handled before the assembly of the laptop, so I probably didn't think too much of it. I took a general photo of the laptop's innards, but if you think that you could tell me a bit more, I can take a proper high-res photo of the heatsink.

Also it wasn't an Acer repair shop, it was a shop that was listed on my warranty from the store that I bought the laptop from. Although the warranty seems to be genuine, like something that Acer would issue.

 

[Roland Of Gilead]

Howdy.

Now that I think of it... When I took the lid off I laid eyes on the heatpipes, they didn't strike me as "brand new". I think they had some scratches and probably patina. I don't really know how they are handled before the assembly of the laptop, so I probably didn't think too much of it. I took a general photo of the laptop's innards, but if you think that you could tell me a bit more, I can take a proper high-res photo of the heatsink.

Also it wasn't an Acer repair shop, it was a shop that was listed on my warranty from the store that I bought the laptop from. Although the warranty seems to be genuine, like something that Acer would issue.

Yes, it's no harm to show a pic. I wouldn't expect markings on the heatsink if it hadn't been disturbed. Did you ask them to check the CPU? I guess they could have removed it and repasted for good measure, but, if they did a bad job of it, that might account for the high temps.

The bottom line is, your CPU should not be getting that hot under a very moderate load. Something is amiss.

That you had an unauthorized repair store fix it voids the warranty, I'd imagine. You might contact the repair shop , and explain the issue once more. Get them to test again.

 

[RubyTheFlareon]

Yes, it's no harm to show a pic. I wouldn't expect markings on the heatsink if it hadn't been disturbed. Did you ask them to check the CPU? I guess they could have removed it and repasted for good measure, but, if they did a bad job of it, that might account for the high temps.

The bottom line is, your CPU should not be getting that hot under a very moderate load. Something is amiss.

That you had an unauthorized repair store fix it voids the warranty, I'd imagine. You might contact the repair shop , and explain the issue once more. Get them to test again.

Well, upon closer inspection of the heatpipes I didn't notice anything that could indicate any disturbance, and the sticker on the cooler that overlaps the heatpipe is pretty much intact. I'll put the pictures in the next post.

No, I didn't ask them to check the CPU or anything that would require them to unscrew the bottom lid really (matrix replacement doesn't require it, does it?) and they have also stated that they haven't done anything other than that.

I am just curious if it is even physically possible for the CPU to go from room temperature to 90 celcius in less than 2 seconds. It just seems to me that the problem is with the way CPU registers its own temperature, because the CPU shows high temps both when freshly booted after overnight sleep and after playing videogames for hours and being objectively warm to the touch.

The repair shop address was listed IN the warranty, so I don't think it would be voided.

 

[RubyTheFlareon]

Click for better resolution

https://imgur.com/a/0IWV20S

 

[RAIDGoblin]

it isn't one of those annoying laptops like my friends where you have to take the heat-sink off to get to the screen cable so I wouldn't have thought they had touched it, but it could have still been knocked or something, the only way to be sure it's a temperature monitoring problem is to re-paste it so your absolutely certain it's properly seated, if your not confident doing that yourself you could take it back to the repair shop, or to a different repair shop for a second opinion