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2 Posts

04-29-2020

United States of America

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Yoga S740-14IIL USB-C to HDMI not working anymore

2020-04-29, 16:14 PM

Hello everyone,

 

I use a second monitor via the USB-C/HDMI multi adapter (Elando). This has worked wonderfully so far. But since a few days the second monitor is suddenly no longer recognized.

I haven't changed anything, except that a few updates have been done by Windows and Lenovo.

It doesn't seem to be the adapter. The USB ports are still working. I've already tried another adapter from another brand. Same problem.

I checked all drivers. These are up to date.

 

Any ideas?

 

Thank you for your help

 

Dirk

 

 

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1 Posts

05-01-2020

United States of America

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Re:Yoga S740-14IIL USB-C to HDMI not working anymore

2020-05-01, 8:38 AM

Hi,

 

I have same issue, my yoga is just 4 months old and I was using I-TEC USB-C Metal Low Profile 4K Tripple Display (also 4 months old..) for my two monitors. Yesterday I came back from work, where everything was working fine and today in the morning, USB-C connector is not working. 

I tried verificate every usb devices in the device manager and install every windows and lenovo update, but nothing helped.

 

It's really frustrating since the devices are still quite new and suddenly stop working.

 

Best Regards,

Trapper

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5 Posts

03-25-2020

Germany

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  • Message 3 of 14

Re:Yoga S740-14IIL USB-C to HDMI not working anymore

2020-05-01, 9:08 AM

have a look in the following thread. More of us seem to have the problem. Reinstall the BIOS helps temporarily

https://forums.lenovo.com/t5/Lenovo-Yoga-Series-Notebooks/USB-C-port-not-working-on-YOGA-S740/m-p/4612858

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2 Posts

04-25-2020

Denmark

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  • Message 4 of 14

Re:Yoga S740-14IIL USB-C to HDMI not working anymore

2020-05-01, 13:06 PM

I am having a DELL monitor connected to USB-C which is also my charger, I noticed usb-c often do not work after laptop have been in hibernate. 

 

So far solution have been to:

1. unplug usb-c

2. put laptop back in hibernate 

3. wake laptop up

4. finally attached usb-c

 

Now I have however enabled usb always ON in Lenovo Vantage, this have been working for 2-3 days now.

 

Would however prefer Lenovo fixed it

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2 Posts

04-29-2020

United States of America

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  • Message 5 of 14

Re:Yoga S740-14IIL USB-C to HDMI not working anymore

2020-05-13, 17:57 PM

Hi, thank you for your help.

 

Meanwhile the Lenovo Support gave me a sollution. It´s easier than expected:

 

The symptoms you have described point to an error that may have been caused by a slight voltage spike. Therefore a residual current discharge is necessary. This discharge eliminates residual current in the internal components of your notebook.

 

1. switch off your notebook. 

2. Now disconnect all devices from your notebook (printer, scanner, hard drives).

3. remove the memory card in the card reader, even if it is inserted 

4. Disconnect the power cable from the device. 

5. Now press and hold the power button on the notebook for about 60 seconds.

6 Next, plug the power cable back into the device.

7. you can now switch on the notebook again.

 

 

Now it´s working fine again without problems.

 

Cheers 

Dirk

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3 Posts

08-20-2020

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  • Message 6 of 14

Re:Yoga S740-14IIL USB-C to HDMI not working anymore

2020-08-21, 15:46 PM

Thank you very much, I applied this way ant it works.

I really appreciate you and your idea.

 

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3 Posts

08-20-2020

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  • Message 7 of 14

Re:Yoga S740-14IIL USB-C to HDMI not working anymore

2020-08-22, 0:42 AM

USB C worked then after SD the laptop , the same exercise should be applied again which is not serious solution. So, What is the cause of this failure to not allow USB c to not be responded during  labtop startup ? is it software issue or hard ware issue ???we need support by Lenovo

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14 Posts

12-02-2015

United States

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  • Message 8 of 14

Re:Yoga S740-14IIL USB-C to HDMI not working anymore

2020-08-23, 15:18 PM

I have the same issue with a C740-14IML, my video out is not working, Its was all working after i applied some windows updates(maybe not related), then I shutdown later in the day and unplugged the power, now no video out when powered on, charging the laptop works via the port but no video out and I think there is no power out being supplied, this is the front usb-c port, the one for video display.  I check edfor updates again  and there was a bios update for to BNCN38WW from 37 via vantage but that did not help.

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4 Posts

08-30-2020

Australia

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  • Message 9 of 14

Re:Yoga S740-14IIL USB-C to HDMI not working anymore

2020-08-30, 6:35 AM

Sadly did not work for me, but thank you for posting anyway.

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1 Posts

11-08-2020

Germany

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  • Message 10 of 14

Re:Yoga S740-14IIL USB-C to HDMI not working anymore

2020-11-08, 16:42 PM

I have the same problem, suddenly my computer doesn't detect the external Monitor anymore. I am using usb-c display Port cable, the cable works fine. What I see under the device manager is Billboard 2.0  

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