I have a Dell Inspiron 17 5748 running Windows 10 1709 (Fall Creators Update). A good year ago I was able to wirelessly duplicate my laptop's screen to a Samsung UE40J6200 TV. I remember having to install an Intel wireless card and the need to install a piece of software called Intel WiDi to make it work.
I didn't use the functionality for a while and have reinstalled Windows 10 on that laptop since. I looked for the WiDi drivers and found that Intel has discontinued the product saying that Windows now has good Miracast support that can be used instead. The additional bonus would be that an Intel wireless card is no longer required.
Unfortunately I haven't been able to use it with this laptop since then. Whenever I put my TV in the "screen mirroring" mode, the laptop is able to see the TV when choosing the function to connect to a wireless display. The laptop seems to be able to connect and usually the TV will show the laptop's display for about 5 seconds before the image either freezes or the connection is dropped.
What I have tried so far:
- Updated wireless card drivers to latest version
- Updated graphics card drivers to the latest version on the Dell website
- Updated graphics card drivers to the latest version from Intel (using a manual installation option because apparently Dell blocks the installation of the generic Intel drivers now)
- Tried a different Windows 10 machine (a Cherrytrail tablet with a Realtek wireless card. This works fine although the tablet doesn't have the latest Windows updates)
- Tried a Windows 10 Mobile device. This works fine.
- Verified that the driver and hardware supports a wireless display using dxdiag (using these instructions: How to check if your PC supports Miracast
- Verified that the system supports a wireless display using an alternate method (netsh wlan sho d command in a command prompt)
- Connected laptop and TV to my 2.4GHz wireless network instead of having the laptop on the 5GHz network and the TV connected with a wire (this shouldn't matter as Miracast uses WiFi Direct)
I'm now at my wits end as to what I can try next. Google tells me many people complain about Miracast being broken after certain Windows 10 updates but there is never a definite solution available.
The relevant hardware:
- Core i5 5200U with Intel HD Graphics 5500
- Intel AC7265 wireless card
- Samsung UE40J6200 TV
- Wireless network running on my provider's router (5GHz 802.11AC with a 40MHz wide channel on free channels, 2.4GHz 802.11N with a 20MHz channel and having interference from neighbor's access points)
Update on April 5 2019: Still no luck in getting this to work, even with the latest Windows 10 updates. The screen stays black. Using Miracast with a Nokia 6 phone running Android 9 works flawlessly.
Best Answer
The problem might be drivers or BIOS. You may find these at :
The firmware of the TV at the Samsung site, where the latest is apparently version 1510.4 from 2017.09.26. The TV can also update itself if connected to the Internet.
The latest Dell drivers and BIOS for your motherboard at the page of Support for Inspiron 5748 - Drivers & downloads​
The latest Intel drivers.
You may also verify in Device Manager the make of the driver of the Miracast device and search for an update.
If all your drivers and firmware are up to date but the problem persists, the problem is then with Windows 10 version 1709, and you will have to wait for Microsoft to fix it. I don't recommend downgrading to an earlier version of Windows, as some have advocated, because of security concerns, and also because Windows will update itself automatically back to version 1709.