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09-21-2020

AE

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Not detecting monitor from usb c hub

2020-09-21, 10:11 AM

Hello, I have a lenovo yoga s740, and I mostly connect it to my monitor using an external usb c hub using its thunderbolt port. It was working perfectly yesterday, but I woke up today and the monitor wasn't being detected for some reason. I have tried the hub and hdmi cable on another laptop and it works perfectly on the other monitor. Additionally, I have also tried to connect my phone to the thunderbolt port to make sure the problem isn't port related, and it was successful as the connection was working fine. So, I am really not sure how to approach this problem.

Thank You in Advance!

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1001 Posts

03-11-2020

NO

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Re:Not detecting monitor from usb c hub

2020-09-21, 10:53 AM

@ Elghoul12 wrote:
 

 

Hello, I have a lenovo yoga s740, and I mostly connect it to my monitor using an external usb c hub using its thunderbolt port. It was working perfectly yesterday, but I woke up today and the monitor wasn't being detected for some reason. I have tried the hub and hdmi cable on another laptop and it works perfectly on the other monitor. Additionally, I have also tried to connect my phone to the thunderbolt port to make sure the problem isn't port related, and it was successful as the connection was working fine. So, I am really not sure how to approach this problem.

Thank You in Advance!

 

 

Hi Elghoul12,

 

Welcome to the Community Forums.

 

Are you able to try to connect directly to the USB-C on the s740 ? Just to make sure we are talking about a issue with the s740 or not. 

Could you also check the "Windows Update" section of your device to see if any Windows update happen during the date in question of when the monitor stopped working.

 

Try to first uninstall and reinstall any display drivers on the s740:

 

Step 1. Uninstall the Display drivers + drivers.

- Press the Windows key + X , Select "Device Manager"

- Expand "Display Adapters"  

- Right click the display adapter (Intel/AMD/Nvidia) and select "Uninstall"

- If prompted to uninstall drivers associated with this device, tick the box and continue.

- Perform a complete restart of the computer to let Windows install the most generic drivers for the device.

- Then download and install the newest drivers for your device from the Support Page

**Just plot in the serial number of the device and hit enter, might have to press it twice, then head to Drivers & Software and Display and Video Graphics

 

Could be a static build up inside the device that is interfering with certain motherboard connections/circuitry.

 

Step 2. Static Discharge

- Remove all cables attached to the device (power, hdmi, external mouse/keyboard, etc)

- Ensure device is switched OFF

- Hold down power button for 40 seconds

- Re-attach all cables

- Connect the AC adapter, then let the device charge for 2 minutes before starting it back up.

 

In the event there was a Windows Update during the date in question where the problem occurred, then I'd suggest trying to do a Windows Update rollback or use a restore point.

 

Step 3. Rolling back to a previous Win 10 Version:

- Open the Windows 10 Settings Menu by clicking the gear icon in the Windows Start menu, or by pressing “Windows + I” keys.

- Click “Update & security”

- Click the “Recovery” tab on the sidebar.

- Under “Go back to the previous version of Windows 10,” click “Get started.”

- If this is not available, then there should always be a "restore point" you can choose from "System Recovery"

- Click the Windows key and type "System Recovery" and click "Recovery" in the list.  

- Select "Open System Restore" - Click "Next" and select the latest "Restore point" where the device was working.

**Note: System Restore Points will only remove Apps and Programs installed after the selected Restore Point date. It will not remove word/text files or pictures etc.

 

Step 4. Disable Automatic Hardware drivers update

- Right click the Windows Icon, select the "Search" Function.

- Type "Control Panel" and select "Small icons" or "Large Icons" in the "View By" top right.

- Click the "System Icon"

- Navigate to "Advanced System Settings" -> "Hardware"

- Click "Device Installation Settings" and Select "No"

**This will prevent Windows from interfering with your hardware drivers in future updates, but keep crucial security updates rolling.

 

If these steps do not fix the issue, and the hub, cables , monitor functions on other devices as you've explained, then I'd suggest performing a factory reset of the device, as we do not know how far in the Windows update has messed with drivers:

 

Step 5. OKR - One Key Recovery

**This is a complete factory reset of the computer

**Loss of data can occur, so we advise you to backup your data if possible.

 

- Completely shut down the device.  

- Press the Novo Button :  It is the small reset hole on most devices that you need a unfolded paperclip to reach.  

- In case you do not own a device with a OKR button. You can also find out where it is or what reset function it is for your device at the support page under.

 

Knowledge Base & Guides -> User Guides -> And clicking the User guide(Not HTML one) in the list -> Ctrl+F to search the document for "Reset" and/or "Novo Button" / "Novo Hole"

 

- When the system boots up, a menu will appear, select System recovery and follow the recovery process.

- When entering the Windows environment again. Perform step 4 before allowing any Windows updates.

 

Hope this helps.

 

Regards

 

Voithos

 

 

 

 



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