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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)

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.

this is what I did to get miracast to work.
go to all settings-system-shared experience.
turn on nearby sharing so your computer can find the tv.
turn off nearby sharing then use connect to connect to the tv.

For me the issue was resolved by manually setting the interface metric for IPv4 and IPv6 to high numbers (100 and 99) for the Microsoft Wi-Fi Direct Virtual Adapter and the Palo Alto Networks Global Protect (PANGP VPN) connection. I have Windows 10 build 1803, updated display drivers, wi-fi drivers, BIOS, docking station firmware, etc... (I tried many many things before resolving this).

Windows Settings->Network & Internet->Status->Change adpater options

For me, the Miracast display connection was called "Local Area Connection 2", and the PANGP connection was called "Ethernet 2". Right click on the one that represents your Miracast connection, select Properties, highlight Internet Protocal Version 4 (TCP/IPv4) and select properties, click on Advanced, unselect Automatic Metric and type 100 in the Interface Metric box. Click Ok twice, then do the same thing for Internet Protocol Version 6 (TCP/IPv6). I did the same for PANGP, but used the number 99 - for no real good reason, just saying what worked - other numbers probably will work...

Review the ifIndex and InterfaceMetric for all connections by opening a Administrator Powershell terminal (Windows key-X then select "Windows Powershell (Admin)"). Type "Get-NetIPInterface".

tl:dr

This happens because your Smart TV is not getting assigned an (or correct) address via the WI-Fi Direct connection.

Solution

You need to manually set up an IP(v4) address on the Wi-Fi Direct interface/adapter

Having faced the same issue, I did a quick but thorough investigation on this issue, and I too did the majority of troubleshooting steps you did. The question which I had successfully led me to the solution: Why is is I can project the screen only using my android device but not my PC (running Windows)?

I did a comparison on all prerequisites that were needed for a successful connection (i.e wireless chipset support, operating system support, and driver support) and realised I had overlooked one simple thing - the actual connection protocol i.e (wi-fi direct):

An IP address must be setup manually on the interface used to miracast,in this case the Microsoft Wi-Fi Direct Virtual Adapter (similar to WIDI driver)

In Android this is done automatically;

the WiFiP2pMangerclass (provides the API for managing Wi-Fi
peer-to-peer connectivity) assigns IP address to every Group Owner
which is 192.168.49.1, and uses the 192.168.49.0/24 pool in DHCP to
assign addresses to devices that join the Group Owner.

Simply go to Network connections and click properties of the Wi-fi direct virtual adapter and input IP address and subnet:

If your miracast software is not working properly you can get the MicrosoftWireless Display Adapter on Windows store which enhances funtionality of the adapter or perhaps has some patches of some sort: