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Legion Y720 fans not working

2017-07-16, 14:12 PM


Brandnew Y720.



While installing software on desktop .. Lags and Crash.

Starting a game ... crash after one minute.


Cause: The two fans are not moving at all, not even on startup (Bios)


Installed Companion, updated all drivers, updated BIOS to recent 4GCN25WW according to Companion.

Installed Nerve Sense .. even with Extreme Cooling Option set to ON .. fans do not move.

Tried Companion HArdware test which does not find issues.


Problem still not solved.


Has anyone any experiences how to fix that or just send the machine back ?


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Re: Legion Y720 fans not working

2017-07-17, 10:50 AM

Hi there, Jawhatever               -


Thank you for writing in to the Lenovo Forum - happy to have you here today.


You can also start by flushing out all static, AC adaptor and hold down power button for about 15 seconds.

I would recommend contacting Lenovo service centres for better assistance.


Schedule a Call-back for faster support

English 24 hours a day 7 days/week 

During business hours, you may also engage with live chat support.


Update us how it goes.





Kindly note- Please mark the Answer as "Accept as solution" if information provided is helpful.

Give Kudos to a post which you think is helpful and reply oriented


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Re: Legion Y720 fans not working

2017-07-17, 15:29 PM

If this is a new purchase, you can get the machine replaced from the seller.


If it has been more than 30 days, then you need to open a Repair case with Support team and send in your laptop.

Please click on Support link on top of this page, enter your laptop information and follow the instructions.

Thank you.

Current System - Lenovo Y720
Y720 REVIEW - Youtube Link (Opens in New Tab)
If your experience was good today, please feel free to give KUDOS. It Ain't Over, 'til it's over.

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Re: Legion Y720 fans not working

2017-07-18, 18:40 PM

Hi, short update.


I was not sure if the error was not caused by a clean install of Win10 Pro or driver issues.


So, after downloading the recovery image yesterday and re-installing the system to delivery state (Win10 Home) today I am pretty sure that there is a hardware issue.


After re-installation from recovery I installed Service Bridge and Compagnion, updated them too and than ran some tests.


HeavyLoad CPU-Test and a Hardware Diagnostics Tool.

After ap 5 minutes of >95% CPU-load the core temperatures went up to 90°C and Thermal CPU-throtteling kicked in... no movement from fans all the way.


This is where I ended the test. While tinkering around I also noted that the side-HDMI had no function (or does not like my monitor)

2nd monitor detected and screen resolution adjustable .. but nothing shown on screen.





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