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4 Posts

12-14-2019

CH

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USB-C port not working on YOGA S740

2019-12-27, 20:55 PM

My system is up to date (Windows Update & Vantage) and I recently installed the latest BIOS (BYCN30WW).

 

The BIOS update seems to have broken my USB-C port. I was using it to plug in to a hub where I have a monitor and an SD card reader connected but now, none of them seems to be detected or powered.

 

It look like there isn't any power being delivered to the USB-C port at all and nothing shows in the device manager. The regular USB ports are working just fine.

 

I tried to manually update the thunderbolt driver using the one provided on the product page, I tried rebooting multiple times but none of those have worked.

 

Can you help me resolve this issue ? Do I have to ask for a replacement unit ?

 

 

Thank you

 

 

 

 

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25 Posts

12-14-2019

US

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Re: USB-C port not working on YOGA S740

2019-12-27, 22:32 PM

Where did you find this BIOS update, I couldn't find it on lenovo site. Do you have the release notes?

 

Edit: Oh ok it's for the 14", not my 15". I hate that they don't tell you what they actually changed when they reference internal defect tracking numbers.

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4 Posts

12-14-2019

CH

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Re: USB-C port not working on YOGA S740

2019-12-27, 22:34 PM

I got it through Lenovo Vantage but you can also find it here : https://support.lenovo.com/ar/en/downloads/DS541438

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25 Posts

12-14-2019

US

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Re: USB-C port not working on YOGA S740

2019-12-27, 22:39 PM

Yeah thanks, I got excited for a second that they fixed the battery drain issue I have.

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2 Posts

01-03-2020

KR

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Re: USB-C port not working on YOGA S740

2020-01-03, 16:25 PM

I experienced same problem.

In first, the Thunderbolt port was working well.

But after BIOS Update, the port is not working.

 

The laptop cannot detect any devices on USB-C port.

 

How can I the BIOS rollback with previous version?

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1 Posts

01-04-2020

DE

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  • Message 6 of 47

Re: USB-C port not working on YOGA S740

2020-01-04, 11:52 AM

I had the same issue (USB-C port didn't work after BIOS-Update. Somehow, it worked the first start after the update, but since the next restart, it has not been working).

So, I solved it by installing the previous BIOS-Version.

 

On my device, the install file of the previous BIOS-Version is located in "C:\BIOS\BYCN29WW".
I have disabled the Rollback Prevention in the BIOS-Settings before the installation, but I'm not sure if it's necessary. (see here)

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2 Posts

01-03-2020

KR

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  • Message 7 of 47

Re: USB-C port not working on YOGA S740

2020-01-04, 13:16 PM

Thanks, Tscherny,

 

Today, I visited Lenovo Service Center, and I got another solution.

Even though the latest BIOS version installed on the laptop, the Thunderbolt port will

work properly if the BIOS HW Reset.

 

It means, the battery cable open and then re-connect will make it correct.

 

Now My laptop installed bycn30ww and USB-C is working well.

 

I think the BIOS rollback is better solution because you don't need to open back case.

 

 

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3 Posts

01-05-2020

HR

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  • Message 8 of 47

Re: USB-C port not working on YOGA S740

2020-01-05, 13:14 PM

My update to BYCN30WW worked.

 

After that I installed Linux and I am using HDMI + USB mouse adapter via USB-C adapter.

S740-14IIL
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2 Posts

12-16-2019

DK

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  • Message 9 of 47

Re:USB-C port not working on YOGA S740

2020-03-08, 8:23 AM

This keeps happening to me both with bios 30 and 31. 

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2 Posts

03-09-2020

PT

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  • Message 10 of 47

Re:USB-C port not working on YOGA S740

2020-03-09, 21:20 PM

Hello! I'm having the same problem.

 

When i bought the laptop it had the BYCN26WW bios version. After some time the port stopped working. I then updated the bios to the BYCN31WW and it fixed the problem.

Today it stopped working again and I reverted the Bios version to BYCN26WW. The port now works again.

 

It seems that updating/reverting the bios version may be resetting some configurations. 

 

JC

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