Solved My 5GHZ wifi network is no longer appearing on 4 computers and Smart TV


CalypsoArt

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I have been using 5ghz wireless for years. All my computers have been using it, and streaming to my smart TV. Yesterday the TV reported "no wireless connection. " However, I was able to connect to the router's 2.4 ghz network. Checking my computers, (4) all no longer show my 5 ghz wireless network. I unplugged to reset the router, but no go, 5 ghz has disappeared from all the machines and the TV. This cannot be a problem with the machines. Is it possible for a router to lose 5 ghz without affecting the 2.4 ghz?
 

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System One

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Try3

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Is it possible for a router to lose 5 ghz without affecting the 2.4 ghz?
Yes.
Routers have separate on/off settings for their 2.4GHz & 5GHz [5.0/5.8GHz] networks.
- But nobody except you should have been able to use the router's password-protected [Admin] setup facilities to turn off the 5GHz band network.​
- If you have never changed that router Admin password from the default set up by its maker then you might well have been hacked.​
- You should change that Admin password without delay. And write it down because resetting the whole router is the only way of coping with a forgotten password.​

If you want to double-check what WiFi networks [of all bands] a computer's WiFi adapter can detect as you are checking & adjusting the router's settings, you can use
NirSoft WiFiInfoView

Best of luck,
Denis
 

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cereberus

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Yes.
Routers have separate on/off settings for their 2.4GHz & 5GHz [5.0/5.8GHz] networks.
- But nobody except you should have been able to use the router's password-protected [Admin] setup facilities to turn off the 5GHz band network.​
- If you have never changed that router Admin password from the default set up by its maker then you might well have been hacked.​
- You should change that Admin password without delay. And write it down because resetting the whole router is the only way of coping with a forgotten password.​

If you want to double-check what WiFi networks [of all bands] a computer's WiFi adapter can detect as you are checking & adjusting the router's settings, you can use
NirSoft WiFiInfoView

Best of luck,
Denis
This is not always true. Some routers now use a single wifi ssid that connects automatically to 2.4 or 5GHZ depending on signal strength.

I had a router which used to have separate settings but ISP (largest UK ISP} did a firmware update and you could no longer tell which band you were connected to without looking more closely at the signals.

There were many complaints as people kept getting connected to 2.4 GHZ and suffered reduced speeds.

The ISP claimed the change was made to make life easier for customers as they did not need to know about bands any more.

Of course, once firmware was updated, you could not reverse it.

Fortunately, in my case, I had the previous generation router which had separate settings and I went back to using that router.

So it is possible the OP is connecting to 5 GHZ without realising it as router no longer shows a separate wifi ssid.

On my older router, you could select to have separate wifi ssids or a common SSID and fortunately the option was never removed. However, it did reset to default of common SSID on one occasion (I suspect there was a firmware update and it just reset default setting i.e. sloppy update).

Of course, this all this may not apply to OP, but worth checking.
 

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    Yep, Laptop has one.
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hsehestedt

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If you want to verify for sure what band you are connected to, go into settings and view the hardware properties. That will show you details such as the WiFi protocol in use, the link speed, and what network band is in use (2.4Ghz, 5Ghz, or 6Ghz).

Image2.jpg
Image1.jpg
 

My Computers

System One System Two

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    Windows 11 21H2
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    PC/Desktop
    Manufacturer/Model
    Home Built
    CPU
    Intel i7-11700K
    Motherboard
    ASUS Prime Z590-A
    Memory
    128GB Crucial Ballistix 3200MHz DRAM
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    Realtek (on motherboard)
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    HP Envy 32
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    1 x 1TB NVMe Gen 4 x 4 SSD
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    Noctua NH-D15 chromax.black cooler + 10 case fans
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    CODE backlit mechanical keyboard
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    Logitech MX Master 3
    Internet Speed
    300Mb down / 20Mb up
    Browser
    Chromium Edge
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    Windows Defender
    Other Info
    Additional options installed:
    WiFi 6E PCIe adapter
    ASUS ThunderboltEX 4 PCIe adapter
  • Operating System
    Windows 11 21H2
    Computer type
    Laptop
    Manufacturer/Model
    HP Spectre x360 15-BL012DX
    CPU
    Intel i7-7500U
    Memory
    32GB
    Graphics card(s)
    Dual Intel HD 620 and Nvidia GeForce 940MX
    Sound Card
    Built-in Realtek HD Audio
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    4k 15-inch
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glasskuter

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Is it possible for a router to lose 5 ghz without affecting the 2.4 ghz
Yes, it is possible. As others have stated, the circuitry and settings of the router control the band you can connect to. It's not common, but the circuitry controlling one band or the other can fail. Also, other networks close by can interfere as can other electronic devices in your home. Try changing the channel within the router settings to see if it makes a difference.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro 22H2 22621.382
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Optiplex 7080
    CPU
    i9-10900 10 core 20 threads
    Motherboard
    DELL 0J37VM
    Memory
    32 gb
    Graphics Card(s)
    none-Intel UHD Graphics 630
    Sound Card
    Integrated Realtek
    Monitor(s) Displays
    Benq 27
    Screen Resolution
    2560x1440
    Hard Drives
    256 m.2 2230-256+1 tb hdd
    PSU
    500w
    Case
    MT
    Cooling
    Dell Premium
    Keyboard
    Logitech wired
    Mouse
    Logitech wireless
    Internet Speed
    so slow I'm too embarrassed to tell
    Browser
    Firefox
    Antivirus
    Defender+MWB Premium
  • Operating System
    Windows 10 Pro 21H2
    Computer type
    PC/Desktop
    Manufacturer/Model
    Dell Optiplex 9020
    CPU
    i7-4770
    Memory
    24 gb
    Monitor(s) Displays
    Benq 27
    Screen Resolution
    2560x1440
    Hard Drives
    256 gb Toshiba BG4 M.2 NVE SSB and 1 tb hdd
    PSU
    500w
    Case
    MT
    Cooling
    Dell factory
    Mouse
    Logitech wireless
    Keyboard
    Logitech wired
    Internet Speed
    still not telling
    Browser
    Firefox
    Antivirus
    Defender+MWB Premium

CalypsoArt

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OS
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Replaced the modem and router with Motorola MG7700 combo unit. I now have 5ghz and 2.4 ghz working. I will add, the old system ran really hot! I wondered if what seemed to me to be excessive heat eventually became to much for the unit? At any rate, the old equipment was circa 2014. So I expect the new to be a good update.

Thanks to all.
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    Home Built
    CPU
    Ryzen 5600X
    Motherboard
    ROG STRIX B550-I
    Memory
    16GB 3200
    Graphics Card(s)
    GTX 1060 6GB
    Sound Card
    Onboard Realtek
    Monitor(s) Displays
    Dual Dell U3014
    Screen Resolution
    2560x1600
    Hard Drives
    Samsung EVO m.2 500GB x2
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