It's puzzling when a computer has access to the global network via a cable, but wireless devices can't connect. Users often assume the problem lies with the ISP, but the presence of a wired connection proves otherwise. This means the backbone is functioning properly, and the problem is localized within the local network.
Most often, the culprit is the router itself, which for some reason has stopped transmitting a radio signal. The problem could also be a software glitch in the operating system of the connected device or an IP address conflict. In rare cases, it may even fail. Wi-Fi module router, although the wired part continues to function normally.
In this article, we'll detail a diagnostic algorithm that will help identify the root cause of the problem. We'll examine equipment settings, possible hardware faults, and software conflicts. Following the instructions will allow you to restore the connection without calling a technician.
Primary diagnostics of the router's condition
The first step should always be a visual assessment of the equipment's condition. Look at the router's front panel: the wireless network indicator (usually labeled WLAN, Wi-Fi, or with an antenna icon) should be lit or blinking. If the indicator light is completely off, the wireless broadcast function may be disabled programmatically via the admin panel or a physical button.
Many modern models are equipped with a separate on/off button for the wireless module. Accidentally pressing it could interrupt the broadcast. It's also worth checking to see if the device is overheating. If the temperature rises critically, router can disable the radio module to protect components while leaving the wired ports active.
⚠️ Attention: If the Wi-Fi indicator flashes at an unnaturally high frequency or, conversely, does not light up after a full reboot, this may indicate a hardware failure of the radio component.
Try a hard reset of the device. Unplug the power cord, wait 15-20 seconds, and then plug it back in. This simple method clears temporary errors in the device's memory. Often, after this procedure wireless network begins to be detected by devices correctly.
Checking wireless settings
If the device is physically functional, it's worth looking into its software. To do this, connect to the router via cable and enter the gateway address (often 192.168.0.1 or 192.168.1.1) in your browser. In the Wireless settings section, make sure "Enable Wireless Radio" is checked.
Pay special attention to channel and channel width selection. Automatic channel selection can sometimes cause conflicts if neighboring routers operate on the same frequency. Try manually changing the channel to 1, 6, or 11 for the 2.4 GHz band. There are more options for the 5 GHz band, but your device's support for these standards is crucial.
- 📶 Opening hours: Make sure you select a mixed mode (for example, 802.11 b/g/n mixed) so that both old and new devices can connect.
- 🔒 Safety: Check the encryption type. WPA2-PSK (AES) is recommended. Outdated WEP or WPA (TKIP) may block connections on modern devices.
- 📡 Hiding SSID: Make sure that the Hide SSID feature is not enabled if you are trying to find the network manually.
Changes take effect only after clicking "Save" or "Apply." Some models require a reboot after changing radio module parameters. If changing the settings doesn't improve the situation, the problem may be deeper.
What is 20/40 MHz channel width?
Channel width affects speed and stability. 20 MHz is more stable in noisy environments (with many neighboring networks), while 40 MHz is faster but more susceptible to interference. If your Wi-Fi is unstable, try forcing it to 20 MHz.
Problems with drivers on your computer
If the network is visible on your smartphone but not on your laptop, or if the laptop is connected via cable but doesn't broadcast Wi-Fi, the problem may be with your network adapter drivers. In Windows Device Manager, find the "Network Adapters" section. If there's a yellow exclamation mark next to the device, the driver is malfunctioning or missing.
You need to uninstall the current driver and reboot the system. Windows will attempt to install the default driver automatically. If this doesn't help, download the latest version from the official website of the motherboard or laptop manufacturer. It's important to use a wired connection to download drivers in this situation.
It's also worth checking your power settings. The system may be turning off the adapter to save power, which can cause crashes. In the adapter properties, under the "Power Management" tab, uncheck "Allow the computer to turn off this device."
☑️ Checking drivers
IP address and DHCP server conflicts
A common reason why there is wired internet but no Wi-Fi is a malfunction DHCP serversThis service automatically assigns IP addresses to connecting devices. If the address pool is exhausted or an error occurs in the lease table, new clients will not be able to access the network.
You can check this by checking the connection status on the problematic device. If the IPv4 address line shows a value like 169.254.x.x, which means the device was unable to obtain an address from the router. In this case, rebooting the router, which clears the address lease table, can help.
| Symptom | Possible cause | Solution |
|---|---|---|
| Address 169.254.xx | DHCP failure | Rebooting the router |
| Limited (no access) | IP conflict | Change static IP or reboot |
| Constant breaks | Interference on the channel | Change the channel in the settings |
| Doesn't see the network | The module is disabled | Checking the router button/settings |
In rare cases, manually entering the IP address, subnet mask, and gateway into the computer's network connection settings can help. However, this is a temporary solution, and it's best to address the root cause in the router's settings.
⚠️ Attention: When manually registering IP addresses, make sure they are not within the range distributed by the router's DHCP server, otherwise an address conflict will occur.
The influence of interference and physical obstacles
Radio signals are susceptible to environmental influences. Microwave ovens, Bluetooth headphones, wireless CCTV cameras, and even aquariums can cause significant interference. If the router is located near such devices, the signal may be completely lost or extremely unstable.
Wall materials also play a role. Reinforced concrete, mirrors, and foil insulation all block the signal. If there are several such barriers between the router and the client, the device may see the network but not actually access the internet due to packet loss.
- 🏠 Place the router closer to the center of the apartment and higher from the floor.
- 📺 Move equipment away from televisions and microwaves.
- 📡 Use the 5 GHz band, it is less crowded and penetrates obstacles better (albeit over a shorter distance).
Resetting settings and updating firmware
If software glitches persist, resetting to factory settings can help. There's a reset button on the router body. Reset (often recessed into the case). Press it with a paperclip for 10-15 seconds until the lights blink. After this, the router will be as good as new, and you'll need to re-enter your ISP login and password.
It's also critical to keep track of your software (firmware) version. Manufacturers release updates that fix security bugs and issues related to Wi-Fi instability. You can check for updates in the "System Tools" or "Administration" sections of the web interface.
The update process requires a stable wired connection. Interrupting the firmware download can brick the router. Therefore, make sure the cable is securely connected and do not turn off the power until the update is complete.
Wi-Fi module hardware failure
In the worst-case scenario, when nothing helps, the radio module may be faulty. Electronics are sensitive to power surges and lightning strikes. Often, it's the wireless component that burns out, while the WAN and LAN ports remain intact.
You can diagnose this by connecting to the router via cable and checking the system logs. They may contain entries about wireless chip initialization errors. Another sign is the absence of any wireless networks from this router, even at a short distance.
In this situation, there are two options: replacing the router or using an additional router as an access point. If the main router is expensive and functional, you can buy a simple router or a second router, connect it to the first one with a cable, and set up Wi-Fi sharing through it.
⚠️ Warning: If your router is under warranty, do not attempt to open the case for repairs yourself - this will void your warranty.
Why is Wi-Fi slow when the cable gives full speed?
Wireless communication is half-duplex, meaning data is transmitted sequentially. Speed is reduced by air loss, encryption, interference, and distance. Cable provides a stable, lossless full-duplex channel.
Can a computer virus disable Wi-Fi?
Yes, some malware can change network settings, block services, or disable the adapter. It is recommended to scan the system with an antivirus and reset the network settings using the command netsh winsock reset.
How often should I reboot my router?
To maintain stable operation, it is recommended to reboot the router (unplug it from the power outlet) at least once a week. This clears the device's RAM of temporary errors and accumulated junk.
Does the number of connected devices affect Wi-Fi performance?
Yes, each connected device shares the bandwidth. If one user is downloading torrents or watching 4K video, others may experience access issues, even if the wired connection isn't fully loaded.