If the TV says 'Server Cannot Be Reached/No Internet Connection', it means that the TV has no internet access. Please follow the below methods to do the troubleshooting:
Check whether the TV connects to the wifi network successfully. You could check the internet connection on the TV: Settings --> Network & Internet --> Check Internet Connection:
2. Confirm whether the wifi network has internet access. You could check it on your mobile phone or laptop.
3. Change another wifi network on the TV.
4. Check whether the Time and Date are correct on the TV.
5. Try to restore the TV back to the factory settings.
Press the Settings 
button on the TV remote, then select Settings --> System --> About --> Reset --> Factory Reset:
If the issue can’t be resolved, please feel free to call the TCL hotline for further help.
