Cable Internet Works, Wi-Fi Doesn't: Causes and Solutions

The cable internet works without any problems, but The Wi-Fi network disappears from the list of available networks or devices cannot connect to it. — the problem often lies in the router settings, IP conflicts, overheating equipment, or a software glitch. Before calling your ISP, check that the wireless network indicator on the router is lit, that your antivirus isn't blocking the connection, and try rebooting the router using the button on the router—this resolves up to 70% of Wi-Fi issues on TP-Link, ASUS, and other popular brands.

In this article we will look at all possible reasons, where there is internet via an Ethernet cable, but no Wi-Fi - from a simple disconnection of the wireless module to complex conflicts in DHCP settings. You will receive step-by-step instructions for diagnosing and troubleshooting problems, as well as tips on how to prevent the problem from recurring. We'll start with the simplest and gradually move on to more in-depth settings.

If you're unsure of your technical skills, don't worry: most solutions don't require any specialized knowledge. Simply follow the instructions and carefully check each step. And for those who want to delve deeper, we've added Unique data on the hidden settings of popular router brands, which are rarely mentioned in standard manuals.

1. Checking basic parameters: router, cables and indicators

Before digging deep into the settings, make sure the problem isn't just on the surface. Let's start with physical diagnostics equipment:

• 🔌 Router power supply: Check that the power supply is plugged into a power outlet and the power indicator is green/blue (white on some models). A blinking orange light may indicate a hardware failure.
• 📡 Wi-Fi indicatorOn the front panel of the router, the wireless network icon (usually represented by waves or an antenna) should be lit or blinking. If it's off, the module is disabled either by software or by physical means.
• 🔗 Ethernet cables: Make sure the cable from your ISP is firmly inserted into the port. WAN (usually highlighted in blue), not in LANConfused ports are a common cause of problems.
• 🔄 Wi-Fi button: on some routers (for example, TP-Link Archer C6 or ASUS RT-AX55) There is a physical button to turn the wireless network on/off. Press it once.

If the Wi-Fi indicator is not on, try reboot the router: Unplug the power for 30 seconds, then plug it back in. Wait for it to fully boot up (usually 1-2 minutes). In 30% of cases, this resolves the temporary glitch.

⚠️ Attention: If after rebooting the Wi-Fi indicator still does not light up, and the router makes unusual sounds (beeping, crackling) - this is a sign hardware failureIn this case, the device will need to be repaired or replaced.

2. Checking the Wi-Fi settings on the router

If everything is physically fine but Wi-Fi still isn't working, the problem may be in your router settings. Connect to it via cable or use another device (such as a phone with mobile data) to access the web interface.

The login address is usually indicated on the router sticker (for example, 192.168.0.1, 192.168.1.1 or tplinkwifi.net). Enter it in the browser address bar, log in (default logins/passwords: admin/admin, admin/password or see sticker).

Next, go to the wireless network section (the name may differ):

• 📋 TP-Link: Wireless (2.4GHz/5GHz) → Wireless Settings
• 📋 ASUS: Wireless Network → General
• 📋 Keenetic: Wi-Fi → Hotspot

Make sure that:

1. Flag "Turn on wireless broadcasting" (or similar) is installed.
2. Network Name (SSID) is not empty and does not contain invalid characters (for example, Cyrillic on some models).
3. In the field Network mode selected 802.11 b/g/n/ac/ax (or 11ac for 5 GHz).
4. Channel (Channel) is installed in "Auto" or a free one is manually selected (for example, 1, 6 or 11 for 2.4 GHz).

If you made any changes, save the settings and reboot the router. Then try connecting to Wi-Fi again.

⚠️ Attention: On some routers (Zyxel Keenetic, MikroTik) after changing Wi-Fi settings, it is required forced configuration update via button Apply or RebootWithout this, the changes may not take effect.

3. IP address conflicts and DHCP failures

One of the common reasons why Wi-Fi doesn't work even with a working cable connection is IP address conflict or DHCP server failures. This occurs when the router cannot correctly assign addresses to devices on the local network.

Symptoms of the problem:

• 📱 The device connects to Wi-Fi, but there is no internet access ("No network access").
• 🖥️ The connection status displays an IP address of the type 169.254.x.x (this means DHCP did not work).
• 🔄 After rebooting the router, Wi-Fi starts working temporarily, but then disappears again.

To fix this:

1. Go to your router settings (as in the previous section).
2. Find the section LAN or Local area network.
3. Check that DHCP server is enabled and a range of addresses (for example, 192.168.1.100–192.168.1.199) does not overlap with the static IPs of other devices.
4. If you use static IP on some devices, make sure they are out of DHCP range (For example, 192.168.1.2–192.168.1.99).

Also try manually release and renew IP on the problematic device:

• 🪟 Windows: open Command line and enter:

  ipconfig /release
  ipconfig /renew

• 📱 Android/iOS: Forget the network in Wi-Fi settings, then reconnect.

4. Firmware issues and resetting settings

If the previous steps did not help, the problem may be in router firmwareOutdated or corrupted firmware often causes Wi-Fi issues, even if the cable connection remains stable.

Signs of faulty firmware:

• 🔄 The router reboots spontaneously.
• 📉 Wi-Fi speed drops sharply or disappears at regular intervals.
• ⚙️ Some functions in the web interface are unavailable ("gray" buttons).

Solutions:

1. Update the firmware:
   • Download the latest version from the manufacturer's official website (for example, for TP-Link Archer C7 — support.tp-link.com).
   • Go to the section System Tools → Firmware Update (the name may differ).
   • Download the firmware file and wait for the process to complete (do not turn off the power!).

Reset to factory settings:

• Press and hold the button Reset (usually recessed into the body) 10-15 seconds.
• After resetting, configure the router again (Wi-Fi name, password, connection to the provider).

⚠️ Attention: On routers ASUS with firmware Asuswrt-Merlin Factory reset may result in loss of functions, added by the custom firmware. Before resetting, back up the settings in the section Administration → Save/Restore.

What to do if the firmware crashes?

If after the update the router does not turn on or all the indicators are flashing, try restoring the firmware via emergency mode (usually by holding down the Reset button while turning on the power). This will require a special utility from the manufacturer (for example, TFTP for TP-Link).

5. External interference and channel overload

Wi-Fi operates in a radio frequency range that is susceptible to external interferenceIf there are many other networks, microwaves, cordless phones, or even some USB 3.0 devices nearby, the signal may weaken or disappear completely.

How to diagnose and fix:

• 📊 Ether analysis: use apps like Wi-Fi Analyzer (Android) or NetSpot (Windows/macOS) to see channel congestion. If your channel (for example, 6) is overloaded, change it in your router settings.
• 📶 Change of rangeIf you have a dual-band router, try connecting to the network. 5 GHz (less congested, but with a shorter range). Network names may differ (for example, MyWiFi_5G).
• 🔄 Channel width: in the Wi-Fi settings, try reducing the channel width with 40 MHz to 20 MHz (Especially relevant for 2.4 GHz). This will reduce speed but improve stability.

Also check router location:

• 🏠 Do not place it in closed cabinets or near metal objects.
• 📡 Antennas should be pointed vertically (for better coverage across multiple floors) or at an angle (for wide coverage in one plane).
• 🔌 Avoid placing near sources of interference: microwaves, cordless telephones, wireless speakers.

6. Problems on the device side (phone, laptop, TV)

Sometimes the problem is not in the router, but in device, which can't connect to Wi-Fi. This may be due to:

• 📱 Wi-Fi adapter driver failure (valid for Windows and macOS).
• 🔄 Incorrect network settings (for example, a static IP that conflicts with DHCP).
• 🛡️ Blocked by antivirus or firewall.

Diagnostics by device:

🪟 Windows 10/11

1. Open device Manager (Win + X → Device Manager).
2. Find the section Network adapters, right-click on your Wi-Fi adapter (for example, Intel Wi-Fi 6 AX200) and select Update driver.
3. If the update does not help, remove the device (Remove device), then restart your PC - the driver will be installed automatically.

📱 Android/iOS

• Forget the network: Settings → Wi-Fi → [Your network] → Forget.
• Turn on/off airplane mode.
• Check if it is turned on power saving mode - It can turn off Wi-Fi in the background.

🖥️ macOS

1. Open System Preferences → Network.
2. Select Wi-Fi, click Additionally and remove your network from the list Preferred networks.
3. Reset network settings: sudo ifconfig en0 down && sudo ifconfig en0 up (V Terminal).

If the problem occurs only on one device, and the others connect fine - it is precisely its faultIn this case, resetting network settings or reinstalling drivers will help.

7. Router hardware malfunctions

If you have tried all software methods but Wi-Fi still does not work, it is possible hardware failureThe most common failures are:

• 📡 Wireless module (burns out during power surges).
• 🔌 Antennas or connectors (oxidation, cable breakage).
• 🔥 Capacitors on the board (they swell over time).

How to diagnose:

• 🔍 External examination: check if the antennas or the case are melted, or if there is a burning smell.
• 🔊 Sounds: If the router makes a high-frequency squeal or crackling noise, this is a sign of a faulty power supply or capacitors.
• 🔄 Test with another router: Connect your ISP's cable to a different router. If the Wi-Fi works, your router is broken.

Solutions:

• 🛠️ RepairIf your router is under warranty, contact a service center. Self-repair (soldering capacitors, replacing antennas) is only possible with experience.
• 🆕 Replacement: If your router is older than 5 years, it's better to buy a new one. Modern models (for example, TP-Link Archer AX21 or ASUS RT-AX55) support Wi-Fi 6 and cope better with interference.

⚠️ Attention: On routers with removable antennas (For example, Tenda AC10) Check that they are tightly connected. Sometimes the contact becomes corroded, and simply removing and reinserting the antenna is sufficient.

FAQ: Frequently asked questions about Wi-Fi not working

🔹 Why does Wi-Fi only disappear at night?

This may be due to:

1. Network congestion neighboring routers (in the evening/at night, everyone is home and actively using Wi-Fi). Solution: change the channel to a less crowded one.
2. Task Scheduler on the router (some models turn off Wi-Fi on a schedule). Check the section Parental control or Schedule.
3. Power surges (If the router is connected to a power outlet without a surge protector). Use a surge protector.

🔹 Can a virus on a phone disrupt Wi-Fi?

Yes, some viruses (eg. Android.Triada) can:

• Block connections to certain networks.
• Redirect traffic through proxy.
• Load the network with unnecessary requests, causing dissociation with the router.

Solution: scan your device with an antivirus (for example, Malwarebytes), then forget the network and reconnect.

🔹 Why does Wi-Fi work on my phone but not on my laptop?

Possible reasons:

• Wi-Fi adapter driver on your laptop is outdated or malfunctioning. Update it via device Manager.
• The laptop is connected to a VPN, which blocks local networks. Disable the VPN.
• Airplane mode is enabled on the laptop. Or power saving turns off Wi-Fi. Check your power settings.
• MAC filtering The router only allows access to certain devices. Check the list of allowed MAC addresses in the router settings.

🔹 How can I check if my ISP is blocking my Wi-Fi?

Providers rarely block Wi-Fi (it's against their business model), but they may sometimes restrict:

• Number of connected devices (for example, the "For one device" tariff).
• Traffic type (for example, torrents or VPN).

To check:

1. Connect another device (e.g., a phone) to the router. If Wi-Fi works, the problem is with the original device.
2. Call your provider's support team and find out if there are any restrictions on the number of devices or connection type.

⚠️ Please note: Some providers (eg. Rostelecom Wi-Fi speed may be limited (in the "Home Internet Start" plan). Check this in your personal account or with your operator.

🔹 What should I do if my router gets hot and disconnects Wi-Fi?

Overheating is a common cause of Wi-Fi disconnects. Causes and solutions:

• DustinessClean the router of dust using compressed air (do not use a vacuum cleaner!). Pay special attention to the ventilation openings.
• Poor ventilation: Do not place the router in enclosed spaces (cabinets, niches). Ideally, place it on an open shelf.
• Power supply failure: If the power supply housing is hot, replace it with an original one.
• High load: Disconnect unnecessary devices from the router, reduce the number of simultaneously running services (torrents, IP cameras).

If your router continues to heat up, try installing alternative firmware (For example, DD-WRT or OpenWRT), which better manages heating.