My TCL 55 smart tv loses the wifi signal. This worked for almost two years and I know the signal is great at about 50mbps. Started about a month ago, now works 15 minutes.

The issue you're describing with your TCL 55-inch QLED Smart TV, model U55X9006, where you can hear audio but the screen is black, could be caused by a problem with the backlight or the backlight driver.
Here are some steps you can try to troubleshoot the problem:

1. Check the backlight settings: Make sure that the backlight settings on the TV are set correctly and that the backlight is not turned off.
2. Check the backlight driver: The backlight driver is responsible for controlling the backlight, so check that it is functioning properly.
3. Check the backlight inverter: The backlight inverter is responsible for providing power to the backlight, so check that it is functioning properly.
4. Check the video signal cable: Make sure that the video signal cable is securely connected and that there are no damaged or loose wires.
5. Check the T-con board: The T-con board is responsible for controlling the video signal, so check that it is functioning properly.
6. Inspect the screen: Check the screen for any visible damage.
7. Contact TCL customer service: If the above steps did not resolve the problem, it is best to contact TCL customer service for further assistance and repair options.

Question edited for clarity.
Question moved from Cooktops!

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If everything else is working then it must be the WIFI module on the tv. Now you should be able to use a USB device to update the firmware on the tv if yu have already done so just to see if that works

If you need further help, reach me via phone at https://www.6ya.com/expert/steven_a67ead41eb5fc62a

you have to have either a SMART TV or a TV with USB PORTS. Basically if your TV is more than 2 years old it may not work.
I have a 55 inch LG and a 55 inch Phillips and they work great for getting on the internet and adding a external hard drive. Plus you might be able to use RUKU and other usb devices on the newer TV's
If you decide to get a SMART TV I would suggest a wireless usb keyboard with touchpad. Have fun.

Hi,
It might be easier to use the connection gateway on the wi fi router, once pressed you will have a few minutes to connect the TV to the temporarily unsecured router gateway

Your other devices all buffer the signals internally. Your TV does not. Any disruptions in the continuity of the wireless signal show up as pauses and breaks in the streaming.

You can spend time trying to diagnose, and then changing WiFi channels But quite honestly, if you have neighbours who don't know or care about wireless then any fix you do will be undone because they'll just trample over your signal again.

Either go with a bit of cable (Ethernet cable) from the router to the TV, or buy some Ethernet of Power adapters (Homeplugs) and use them. Beware though, homeplugs radiate quite a bit of energy because they use the unshielded mains cable for transmission. They aren't as quick either as Ethernet cable direct because of the lag from the encryption/decryption and error correct processing.

Check your router to see if the MAC Filtering feature is in use. If it is then you will need to add the TV's MAC address to the list of permitted devices before the connection will complete.