12-27-2018 01:53 PM - edited 12-27-2018 01:55 PM
I was able to find it, by opening the laptop and looking for the EC. You might be able to look at a disassembly and write down the EC model from a picture or video.
01-01-2019 06:24 AM - last edited on 01-01-2019 08:11 AM by Majestic
Found a new bios update (Vantage) for my model:
Model: ideapad 720S14-IKB
Old bios: 4VCN46WWV2.12
New bios: 4VCN48WWV2.14
Mod's Edit: Serial number removed from public view to protect member from its unwanted use.
Machine Type Model 80XC0010MX
01-04-2019 07:37 AM
Hi guys, I recently got one with an i7-8550u quite cheap secondhand and I've been playing around tweaking it. Obviously the first thing I noticed was the noisy fan. I've scummed through much of this thread and after applying a few fixes I've now managed to get it to be completely quiet until it hits 70 degrees. I haven't tested it out for too long, but it works after both sleep and restart.
Here's what I did:
1. Updated everything through Lenovo Vantage as well as downloading the BIOS update manually.
2. Set up throttlestop and undervolted the CPU. I managed to get a stable -135mv on core/cache and -80mv on iGPU and system agent. This didn't solve my fan problem, but it did bump up my cinebench score to 650, as well as reducing overall thermals produced causing it to hit 70 degrees later on. Throttlestop is a bit bad in that you need to setup a task scheduler task for it to start with Windows, I have however a guide posted here on another forum if you want to do so.
3. Set the Control Panel Power Plan options(just search "Edit Power plan" in the start menu to get there) to:
4. [Most important] Notebook Fan Control:
Note: As mentioned by other members we lack a specific profile to the 720s. The Lenovo Yoga 2 13 config seems to keep the fans completely idle until it hits the critical temp and then they start at 100% and gradually turns down as the PC cools down. I find this acceptable as the passive cooling seems to be pretty good meaning you'd only hit 70 degrees during high loads. The PC might hit the crit temp during startup and shutdown but should quiet down quickly.
01-15-2019 10:07 PM
You are awesome.
I'm going to try out your methods and see how they work for my model. I'm familiar with overclocking desktops but had not realized Throttlestop allowed us to change voltage settings on our 720s.
I look forward to undervolting, testing stability, and then setting up a fan speed that isn't so unbearable.
01-16-2019 03:15 AM
Glad I could help
I had to decrease my core/cache undervolt to -120mv as I was having some bluescreens in some games even if I ran Prime95 stable for half an hour. It still means I'm able to keep a consistent 4-core turbo boost of almost 3Ghz tho. I don't think undervolting System Agent does anything btw, according to some sources it might cause instability due to faulty sensor readings.
If you wanna squeeze some more power out of your system you could look into overclocking the dGPU in MSI afterburner as well, I haven't had too much time with it, but it does seem like theres' some headrooom in overclocking the GPU, especially on the memory clock part. I'm going to test out stability at some point when I find some time.
Also remember that its the Notebook FanControl fix that actually alters the fan profile. Hope you're able to get the fan under control mate
02-01-2019 03:35 PM
I spent some time with this!
What worked for me is the software Notebook Fan Control like above helped alot.
I also stripped the laptop only around 12 screws and your in! I couldnt belive the amount of thermal paste! it was all over the chip and leaking onto the board both CPU and Graphics! so I cleaned it all off with alchol wipes and put a pea size on both and started to put it back together.
Then i noticed that the vents on the base of the laptop its pretty much blocked up with really tight hairy mesh and a plastic bee hive like mesh. so i decided to blow through it and it actually sounded like a high pitched noise through the mesh! so I risked it and took the hairy mesh off but left the plastic bee hive mesh above both fans.
Now my cpu runs at 38 degrees instead of 45 and is dead silent!!! i mean nothing!!! however there is still a small bug that when it gets to 50 degrees, the fans go full speed but the difference is not high pitched whining and just loudish air flow (this is in a silent room) and its not annyoing anymore.
Hope that helps!
02-02-2019 03:42 AM
I currently have the following notebook: Lenovo Ideapad 720S-15IKB.
I don't know if it's been mentioned here yet, but the fans can be controlled with the program NoteBook FanControl and the "Lenovo Ideapad 710S" profile. I only run one fan at 3.3% (Real 8-10%). The device always stays cool and very quiet. The fans can also be turned off completely.
I also set the core, GPU and cache voltages to -0.150,4 V with ThrottleStop and made other smaller settings. Thus it runs even cooler and more economically.
After a long search finally a device with enough power for me and fan control. Maybe it is also possible for the 14 inch.
02-05-2019 02:08 PM
Hey, I also tried out the tweak with Notebook Fan Control.
Yes, the Notebook stays quiet now but when the fan is supposed to run at full speed it only runs at 10% for me.
So I am now scared that I will damage my Laptop when it is not cooling properly.
You can try it out by setting the critical temperature to a low 35 degrees Celsius and just listen whether the fans actually run at full speed. For me it unfortunately doesnt really work. Maybe there is another EC built in our Laptops?
Anyways, I would like to hear of your experiences!