LENOVO LEGION 5 15ACH6H Thermal Paste Change Complete Guide | Honeywell PTM7950

[@PulsarTECH]

Thanks for watching! 😊 If you enjoyed the video, please Like, Comment, and Subscribe for more content! Your support means a lot. If you'd like to support the channel further, consider using Super Thanks! 🚀

[@rhen4short]

Hey man, Lenovo Legion 5 user here. It's been 3 years and I haven't opened up my laptop since purchasing it and your tutorial helped me a lot with cleaning my own Legion 5. Before opening it, my CPU temps were reaching a maximum of 100 degrees celsius while playing games and an average of 60 degrees celsius with non gaming activities such as browsing, watching movies, talking to friends, etc. And right now it's on an average of 45-50 degrees on idle. I found out that there's a lot of dust on the fans that were definitely clogging the airflow. I'd like to say thank you for uploading this tutorial video of yours. Now I can buy games on the upcoming steam sale. Thanks again!

[@PulsarTECH]

Awesome! That's a huge improvement. Glad it helped with your gaming.

[@VanDannyCyrus]

You've mentioned the trick with the power button, that's great. Thank you!

[@PulsarTECH]

You bet! Glad it was helpful.

[@engineeringcanada]

Wow, this is the most detailed guide for changing thermal paste on Lenovo on YT. Keep it up!

[@PulsarTECH]

You're welcome, I try to make this video so that anybody can do it on their own, even without much experience. But of course, you need to be very careful.

[@HyperSpeed249]

Thanks, this will be a perfect guide for me when I need to disassemble the laptop.

[@PulsarTECH]

Great to hear!

[@harrydijkstra9936]

Downside of many laptops are the fans integrated under the heatsink which doesn't allow cleaning the cooling stack without removing it from the board. Genuine PTM is basically a forever good material and only cleaning the fans and stack brings the original performance back. There are alot of counterfeits like relabeled PTM3180 and PCM8500 or even worse, regular paste rolled between plastic sheets.

[@PulsarTECH]

I 100% agree, can't think of a worse design for the fans. Why can't they be accessing from the top so that you don't have to change thermal interface every time you want to clean the fans. That's one of the reason why I didn't want to do earlier but seeing the temps climbing so high I had to do it no matter what. By the way, I've got another video after this where I have achieved much better cooling results, check it out if you're interested: kzbin.info/www/bejne/d37Xf62Xd9t6aqc

[@JohnnieTheRabbit-ro1jh]

I repasted my Lenovo Pro 5 With 4070 mobile and Ryzen 9 7945HX with Thermal Grizzly Kryonaut Extreme with a Thermal Conductivity of 14,2 W/mk. And reapplied the thermal pads, a little bit of the thermal pad on VRM's was not applied that good. Temps on crossload are a bit lower now. Maybe I will use Gelid Extrema pads with 15 W/mk pads on VRM's. Max 65 on GPU and max 80 on CPU. GPU can go op to 120 watts and CPU 60 watts (undervolt -25 Curve optimizer and lenovo vantage max 60 watts. It can boost to 105 watts in crossloads, well that's way too much wattage for Ryzen 9 7945HX. Thermal design is rated for 200 watts crossload. I followed your steps!

[@PulsarTECH]

Great, thanks for sharing your experience and feedback!

[@TuanTran-qk9my]

You are using that thermal paste not correctly, the 7950sp paste need around 24 hours for drying the solvent of this paste to change into the final form not the same as the PTM7950 Pad which had been dried normally before shipping. You also used too much paste, it will cause the longer time to heat treat the paste and more difficult during the next time you clean the dry paste.

[@PulsarTECH]

Hi, thanks for your valuable observations. Indeed, I have had to take a different approach to fix this issue. Luckily, everything worked out great. More on that in my next video, but it has increased the results in Cinebench R23 and reduced rendering time on that same video by 2 minutes!

[@premabhakti4034]

Yeah, that's way too much dust. But the problem is you that you can't get there without removing the whole thermal interface and consequently changing the thermal paste each time.

[@PulsarTECH]

Absolutely, that's a major downside of this laptop's cooling design. Easy access to clean the fans is crucial to maintain good air flow.

[@ontheroad1930]

Well done 👍 Everything in details. How often do you recommend changing thermo paste?

[@PulsarTECH]

Usually once a year would be good when cleaning the fans.

[@brandonl4511]

My temps run around 90c... I'm scared for the amount of dust I'm about to find in there lol

[@PulsarTECH]

Hi, if the laptop was like mine with no cleaning for about 3 years, it will be dusty there no doubt about it. But it your thermals never get above 90C, that means the cooling system can handle it pretty well. Either your CPU power doesn't get to 60W or your cooling system is in a superb condition. In my opinion, I would keep an eye on the temperatures and if it stays below 90-95C during intensive use, I wouldn't even bother with thermal interface change. I have got another video where I have achieved much better results. Check it out if you like: kzbin.info/www/bejne/d37Xf62Xd9t6aqc

[@JohnnieTheRabbit-ro1jh]

Hey my ryzen 9 7945HX can go op to 100c and 105 watts in crossload. Thats what too much while gaming. Limit to 60 watt and reapply thermal paste can help.

[@JohnnieTheRabbit-ro1jh]

It is also possible to undervolt the Ryzen 7 5800H with AMD APU TUNING UTILITY to get better performance and lower voltages and same wattage.

[@PulsarTECH]

I haven't done it myself but yes, undervolting the Ryzen 7 5800H using the AMD APU Tuning Utility (or other tools like Ryzen Controller) can help you achieve better performance by improving power efficiency while maintaining the same wattage. Undervolting reduces the voltage supplied to the CPU, which can lower power consumption and reduce heat output. This might help you maintain higher sustained performance, particularly during long tasks or heavy loads, as the CPU may not throttle as quickly due to heat. While undervolting is generally safe, it's essential to test the stability after adjustments, as too low a voltage could cause system instability. Start with small increments and stress-test the system to ensure stability before proceeding further. By the way, in my next video, I achieved much better results-check it out if you haven't yet! kzbin.info/www/bejne/d37Xf62Xd9t6aqc

[@JohnnieTheRabbit-ro1jh]

@PulsarTECH yeah I undervolted my ryzen 9 7945hx. It works.

[@PulsarTECH]

@@JohnnieTheRabbit-ro1jh great!

[@bunnybag]

I've the same laptop, and my 5800H produces Cinebench score of around 14K, but at temperatures near 95°C I'm sure that you were not using the Performance Mode of the laptop.

[@bunnybag]

If that's not the case then maybe you didn't wait for the curing time of this paste. You'll have better results once the paste actually takes it time to settle in Which is around 15-20 hours at room temperature. What I also like to do is stress test for a minute or two, then stop it for a while, and then repeat. Basically I try to switch from very high to ambient and back to very high so that the Phase Change can occur multiple times, and all the gaps get filled.

[@PulsarTECH]

You are correct; I was not using Performance mode. 95°C isn't bad for Performance mode; I think it’s the upper limit for how hot you want your CPU to get. Anything higher needs to be addressed. By the way, in my next video, I achieved much better results-check it out if you haven't yet! kzbin.info/www/bejne/d37Xf62Xd9t6aqc

[@PulsarTECH]

Thanks for the advice. I have tried to run some stress tests for a bit, maybe not enough though, but after 2 weeks or so, I don't think there was much difference, so I have decided to undergo another thermal interface upgrade.

[@tinosqindis1184]

Well detailed disassembly.When running r23 benchmark which performance mode where you using?

[@tinosqindis1184]

Is it quite mode ,or normal mode or performance mode

[@PulsarTECH]

It was in the balanced mode. Actually, today, I've upgraded my thermal interface again and achieved much greater results than before. I will be working on a new video, hopefully it will be out soon, the results are so satisfying. Stay tuned!

[@RedCroc-sr6cc]

Wonder if it's normal for the laptop CPU temperature to reach over 100C when both CPU and GPU are loaded 100%? Thanks for this guide.

[@PulsarTECH]

Could be, but I think it should stay below 100C. My next step would be to change thermal pads for the liquid ones and use the same Phase-change thermal paste to see if it will make a difference.

[@chongys9901]

Ur cpu temp constantly running 100 degrees or just few of the core running to 100degree sometime ? It thermal throttling, I have same issue as well , I think the best suit thermal paste for legion is ptm 7950 , because before I apply new thermal paste , it won't have this happen , this only happen after I'm apply new thermal paste , I have to order one and reapply again 😂 but gpu is okay to use thermal paste

[@PulsarTECH]

​@@chongys9901 I have just posted a new video on my channel where I have fixed this overheating issue completely, check it out. kzbin.info/www/bejne/d37Xf62Xd9t6aqc

[@sleet9289]

Why remove the ssd cards? is that necessary to change the thermal paste?

[@ragerr6060]

Can you give me the link to buy honeywell ptm for other countries or the link you bought from, and how much amount of thermal paste you bought (thickness)

[@ashmaterial]

thats not how you apply paste mate. it should be small amount

[@ragerr6060]

how to identify if the Honeywell is original or from verified seller

[@PulsarTECH]

Well, there ain't any scratch code like on a Gelid or Thermalright products where you can verify its authenticity. My suggestion would be to buy it from a trusted local market place or shop.