trying to duplicate my screen to smart tv

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It could be because the integrated graphics in the laptop usually only supports resolutions like 1280x720 and 4k might just be too much for it to run. Connect your computer to the TV with an HDMI. When you get it to connect with the TV, go to the bottom right of the screen of the laptop where the bar is. Click on the arrow pointing up, and the click "Intel HD Graphics". Click "Graphics Properties" and then double click "display". In display, click "Multiple Displays" and then click "clone displays". Then click "Apply" and then "Yes". Then go to "General Settings" and match the laptops and TV's resolution and refresh rate. I recommend upping the resolution of the laptop to it safe max, but lowering the TV's resolution to match the laptop's could work too. Now that the laptops resolution matches the TV's, unplug the HDMI cable and try to connect with Bluetooth. I don't know how to fix the Bluetooth problem but I think that the resolution of the two being drastically different might have been part of the problem of the video not displaying. I don't really know what I'm doing but t worked for me so hopefully this works for you too!

Thank you, KK, for your involvement. The thing is I found the solution yesterday... and it consists in disconnecting the tv from WIFI... the laptop connects instantly to the qled AFTER I have disconnected it from WIFI... It is not a convenient solution since connecting back the qled means to re-enter the password... which is annoying and pretty difficult by remote-control... however, it works... so, If I need to make a presentation now I have the means. Additionally, I must say, the live connection is much better comparing with a Chromecast one... that's it! Issue solved! Hallelujah!