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Lenovo Yoga 720 15IKB USB-C to HDMI Adapter weird behaviour

2018-10-01, 1:36 AM

Hi, I have been using my Lenovo Yoga 720 15" laptop for almost 5 months.


I having an issue similar to other Yoga 720, 920 users experienced. I cycled through probably all subjects releated and tried possible solutions but couldn't get anywhere.


I had the following USB-C to HDMI Adapter : 


... delivered with product.


A HDMI to VGA (With Audio (USB to Audio Jack)) Adapter : (Tested and works fine on another PC)

A Standart HDMI to VGA Adapter : (Tested and works fine on another PC)


An Acer monitor : https://www.acer.com/ac/en/NZ/content/model/UM.WW3SA.001 (1920 x 1080)


Previously tried adding "USB-C to HDMI" and "HDMI to VGA" adapters end to end, managed to extend my old PCs display. 


Lenovo device detects the monitor for a couple of seconds, refreshes the screen and losts connection( can't detect anymore ). detects and undetects, and so on. This process cycles/loops through over and over again. And "No Signal" message displays at the monitor whole time.


I updated my Intel Drivers using following Link : 


... rebooted. (Only solved screen refreshing problem)



Windows Update (Installed recent updated and rebooted).

Lenovo Vantage Hardware Diagnostics (All tests passed).

Lenovo Vantage Update System (Everything was up to date)

... nothing changed


Lenovo "USB-C to HDMI" product description did not listed monitors with resolution 1920x1080 on the list of supported (Only 1920x1200 and 1920x1440). Is this might be the problem? Is there any other one experienced this or similar problem. Is there any possible method to determine if problem caused by Thunderbolt/USB-C port itself? Any suggestions? 


Thank you for your attention.


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Re: Lenovo Yoga 720 15IKB USB-C to HDMI Adapter weird behaviour

2018-10-01, 9:38 AM

Welcome to the Community Forums!

We'll have to consider that you're trying to convert the Digital Video Out signal comming from the laptop into an analog signal for your monitor, and plus that the cable is only 1920x1200 and 1920x1440. This may somehow provide us the possibility of a compatibility issue. You could try to lower down the resolution of the laptop through the steps in this link: https://www.thewindowsclub.com/change-screen-resolution-windows-10-2 . Or atleast try to connect the laptop using the USB-C to HDMI cable to an HDMI monitor.

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