Wi-Fi & connectivity

[Austin1]

When My tcl roku tv searches for Wi-Fi connections it doesn't pop up any Wi-Fi networks or anything it just asks to scan again I’ve rest my Wi-Fi tried other wifi networks an reset the router itself including turning wifi ping on and off on the tv but nothing works. Also it recognizes when I connect my ps5 through the hdmi but continuously says no signal on every wifi port but usb works. I’ve tried everything except taking it apart. 

[makaiguy]

@Austin1-

See if this helps:

There are some router setting issues that can prevent establishing Roku wifi connections. And to make matters worse, some of them can be caused by recently-reported router updates. These have primarily been reported with routers supplied by internet providers (Comcast/Xfinity, Cox, and AT&T so far), but it's possible they could also occur with other internet providers or user-owned routers that have received similar updates

• ROKU CANNOT FIND LOCAL WIFI NETWORK AT ALL
  If you have one of these situations, see "Reconfiguring Router", below.
   
  A) Some recent router updates have turned off dual band routers' use of the 2.4 GHz band. Some Roku models, notably Roku Express/Express+ (model numbers below 3940) and Premiere/Premiere+ (model numbers below 4620), are lower end units with single band Wi-Fi radios that only support the 2.4 GHz band. They, and many other devices of all sorts that are 2.4 GHz only, can't even see the 5 GHz band, let alone connect to it. If you have 2.4 GHz only Roku model and a dual band router with both 2.4 and 5 GHz bands, be sure the router's 2.4 GHz band is turned on.
   
  B) In the 2.4 GHz WiFi band, all Rokus support channels 1-11, as are used in North America. If your router supports 2.4 GHz channels outside this range make sure your router is set to use a channel in this range and that you aren't using an auto setting that could select channels outside this range.
   
  C) Rokus with dual-band wifi radios can connect to the 5 GHz wifi band in two ranges of channel numbers, 36-48, and 149-165. Specifically they do NOT support the "DFS" channels 50-64 and 100-144. Many home use modems do not include the DFS channels but some do, so be sure your modem is set to NOT use DFS channels. If your router supports DFS channels and you can't turn them off, make sure you aren't using an auto setting that could select DFS channels.

Reconfiguring Router
Thanks to forum user @AvsGunnar  for providing the links below to instructions for reconfiguring router settings for the listed internet suppliers. If you can't do this yourself, you may need to contact your internet provider to make these changes for you:

• Xfinity / Comcast → ( https://www.xfinity.com/support/articles/change-wifi-mode-admin-tool-xfinity-xfi ) with a walkthrough ( https://community.roku.com/t5/Network-Wireless-Wired-Connections/Error-014-30-stuck-for-three-days/m...)
  
  
• Cox → (https://www.cox.com/residential/support/managing-your-in-home-network-with-my-wifi.html)
  
  
• AT&T → (https://www.att.com/support/article/u-verse-high-speed-internet/KM1046172). You can select your appropriate router from the drop down menu.

If your problem was not caused by any of the above, often a restart of the router (even if other devices are still connecting) followed by a restart of the Roku will allow the connection to be reestablished. Depending on your Roku model and Roku version number you'll find the "System restart" option under either "Settings > System > Power" or "Settings > System", or if more convenient you can just remove the Roku's power for a few seconds and let it restart.

[renojim]

@Austin1, check the Wireless MAC address displayed under Settings->Network->About.  If it's all zeros, you may have a hardware failure.

[tizlaney]

I have this same issue.  Seems like my TCL Roku TV is shot.    It was purchased new in December 2018.  Any ideas on what is going on?

Here is what happened and what I have tried:

Was watching TV (streaming via YouTube TV - on WiFi) and started loosing connection to wifi.

• Power cycled wifi (ISP modem and TP Link mesh system) - NO LUCK
• Rebooted TV (pulled cord - and via system menu) - NO LUCK
• Reset Network settings from system menu - NO LUCK
• Tried ETHERNET cable from switch to TV (known good cable & port)- NO LUCK
• Tried Secret WIFI menu reset , enabling, etc (YouTube videos) NO LUCK
• Tried plugging in ROKU Ultra box (old but works) 
  • TV detects Ultra and even automatically names the HDMI input "ROKU" but it constantly ask if the device is "powered on" - (I tried ALL 4 HDMI inputs - same result) - WILL NOT WORK
  • I tested the same HDMI cable with MY LAPTOP and it works perfectly fine as designed displaying my laptop on the screen. (ALL 4 Inputs WORK with Laptop)  (I also tested this on 2 other TCL Roku TVs and the Ultra works perfectly as designed when plugged into an HDMI on TCL Roku TV)
• MAC Address is showing all ZEROS 0.0.0.0 (I believe this to be my issue indicating hardware failure)

SUMMARY

• Wifi and Ethernet DO NOT WORK - MAC id is 0.0.0.0
• HDMI (4 ports) WORK for any device other than ROKU Ultra 
• ROKU Ultra WORKS on all my other devices 
• ALL CABLES are "known good"

If my ROKU Ultra would work I could salvage this TV but since it will not work on this specific TV it has me baffled.

other notes

• tried on 2.4g and 5g (no luck on either)
• tried connecting to mobile hotspot on my phone (no luck)
• tried ethernet to switch, to router, and directly into the modem (no luck on any)

[renojim]

@tizlaney, as you suspected, the all zeros MAC address is your network problem and almost certainly indicates a hardware failure.  It should list separate MAC addresses for wired and wireless (at least my other Roku devices do).  They're both all zeros?  You'll never be able to connect to anything with an all zero MAC address.

I can't imagine why the Ultra wouldn't work.  Maybe try taking it to another TV and force the display mode to 720p (not automatic).

A last resort would be a factory reset.

[tizlaney]

Factory resets have been done several times.

Interestingly I also just purchased a Express 4k+ that will ALSO NOT WORK on this TV.

I tested it on the other 4 TVs I have (3 are TCL Roku) and all 4 work perfect....just not the one in question...its so strange.

I type this from the parking lot of WalMart....guess new TV will be coming out with me.

Thanks for the comment.