My TCL C845K TV can't connect with WIFI

[P_h]

Hello,

My TV can't connect to the WIFI and after many troubleshooting methods, from what the manufacture said is that the TV needs to have between 36-48mhz, but 44 is best MHZ frequency connection. 

Using 128.168.1.1 expert settings I can only select 20mhz/40mhz or 20mhz only and it seems the TV can't pick this up. I just bought the TV and would rather end my contract with Vodafone as their support is very bad. 

Would purchasing my own router be a solution or is there a setting I'm missing? 

It would seem the TV can only pick up the 2.4ghz channel after toggling different settings, when I do a hard reset of the router and TV the connection works for a while extremely well then it will suddenly stop working. Toggling different settings have different results sometimes the TV can't detect the WIFI at all and other times it will connect but there will be no Internet connection. 

My older Samsung TV couldn't pick up a great connection but it was just about bearable as its quite old I believe it was using the 20mhz connection semi-successfully. All my other devices work fine particularly my MacBook Air M1 has always been super fast. 

[P_h]

Cheers, I checked the connections and it still doesn't work. The TV should be 5ghz compatible but it can just about hold a 2.4ghz connection.

My older 5 year old Samsung TV can easily hold a strong connection and stream 4k content whereas the TCL can't even stream 240p.

My other devices are fine and I checked the ISP settings, toggled various settings like DNS, updated firmware, changed the ehternet cable, rebooted all devices, checked permissions. 

I believe the TV and Vodafone are just not compatible and it must be a setting I cannot change. When I hot-spot my O2 phone sim it easily connects and fast. 

[Cynric]

@P_h  Do you another device to test on 2.4GHz?

Do you have a WiFi scanner to see if a neighbour has a strong signal on the same 2.4GHz channel number?

Can you change the 2.4GHz channel number?

[P_h]

I noticed with the Vodafone wifi hub the ability to change channels only appeared after I rebooted the whole router. When I do I changed to various recommend channels which I found on these forums. 

I will try a wifi scanner but I'm anticipating it won't reveal much since my old TV can connect to the 2.4ghx perfectly fine. Thanks for that!

All my devices I tested can easily connect to the 2.4ghz and work perfectly such as my Macbook M1, pixel 7 phone and smart home devices. 

I will be recieving the same replacement TV which I hope will work in 2 days. If it doesn't I might try another brand TV and hope for that.

I just really wanted it to work as the TCL C845K is actually a great TV and it's the specific one I wanted. 

[Cmdr-Starker]

When the Google TV with Chromecast came out that suffered from the same problem however, you couldn't see the 5GHz Wifi Network at all.  Google eventually resolved the problem with a Firmware update.

Most decent third party routers give you the option to change the 5GHz Bandwidth, such as ASUS.

[CrimsonLiar]

Right about now, I'd be setting up a temporary WiFi hotspot on your mobile phone using a different SSID and password  (try 5GHz first then 2.4GHz).  You can then see if it's just that the TV is struggling with WiFi in general - it can happen!

[P_h]

Thanks, I think this brings some more clarity on the situation, the TV does seem to run stock google TV software android TV OS 11. My 5 year old Samsung TV can easily run 4K content so it does seem to be some issue with the TV software at this point. 

I exchanged the TV with the same one and surprisingly this one is slightly better but sometimes unusable as the internet will connect now but very slowly. It still can't find and connect to a 5ghz connection. 

I tried the usual troubleshooting methods like splitting SSID bands, static DNS settings, changing bandwidth frequency, rebooting router, rebooting TV etc..

Doing some searches online can't seem to find any topics on this specific software and TV and Vodafone and TCL support is really poor. TCL just say it's probably faulty so return it for a fix.