Why Wi-Fi isn't working: a complete diagnosis and solution

Have you suddenly lost internet access, and you see a cross on the Wi-Fi icon in your computer's tray or on your smartphone's screen? Or is the network connecting, but pages aren't loading, and videos are constantly buffering? Are you experiencing problems with wireless Internet — one of the most common technical problems encountered by every second user. There can be dozens of reasons, from the banal power outages to complex IP address conflicts or ISP interference in router settings.

In this article we will look at all possible scenariosWhy Wi-Fi isn't working—from the obvious to the more exotic. You'll learn how to quickly diagnose the problem. router, computer, smartphone or Smart TV, and also receive troubleshooting checklists without calling a technician. We'll pay special attention to hidden settings, which are not mentioned in standard instructions, but which often become a source of headaches.

1. Check the obvious: router, cables, and power

Before digging deep into the settings, make sure the problem isn't just on the surface. Statistics show 30% of support requests are decided at this stage.

• 🔌 Router power supply: Check if the power indicator is on. If not, try a different outlet or replace the power supply (especially relevant for older models). TP-Link And D-Link, where the power supply often fails).
• 📡 Antennas: If your router has removable antennas (for example, ASUS RT-AX88U), make sure they are tightly screwed in. A damaged connector can lead to loss of signal.
• 🔗 Cable from the provider: inspect the Ethernet cable running from the ISP to the port WAN (usually highlighted in blue). Bends, breaks, or loose connections are common causes of connection failure.
• 🔄 Reboot: unplug the router from the power outlet 30 seconds, then turn it back on. This will clear the DNS cache and temporary errors.

If after these manipulations the indicator Wi-Fi The router light didn't come on, but the internet via cable (with a direct connection to the PC) works - the problem is wireless module of the routerIn this case, the only solution is a reset or a device replacement.

⚠️ Attention: if you have fiber-optic Internet (GPON), check also optical cable - it is easily damaged when bent. If the fiber breaks, the indicator PON on the router will flash red.

2. Problems on the provider's side: how to check

Often users blame their equipment, although it is the fault of Internet provider. For example, Rostelecom, Beeline or MTS They may be carrying out maintenance or imposing speed limits for non-payment. Here's how to diagnose this:

• 🌐 Ping to the gateway: open command prompt (Win + R → cmd) and enter:

  ping 8.8.8.8

  If the packets don't arrive (The specified node is unavailable), the problem is with the provider or the physical connection.

• 📞 Call for support: Call your provider (the number is usually listed on your contract or on a sticker on your router). Check if there is accidents on the line or blocking at your address.
• 💰 Payment arrearsCheck your personal account on the provider's website. Sometimes access is restricted due to late payment, but the notification is delayed.

If your ISP claims everything is fine on their end, but the internet still isn't working, try connecting a cable directly to your computer (bypassing the router). If the connection is restored, it's your internet connection. router.

⚠️ Attention: some providers (eg Dom.ru) bind the device's MAC address. If you've replaced your router, your internet may not work until you register the new MAC address in your account.

3. Router settings: what could have gone wrong

If your router is turned on but Wi-Fi isn't broadcasting internet, the problem may lie in its settings. The most common issues are:

• 🔒 Wi-Fi passwordIf you changed it but forgot the new one, you won't be able to connect. Reset the router using the button Reset (hold for 10 seconds) and set up again.
• 📶 Network operating mode: some routers (eg. Keenetic) can automatically switch between 2.4 GHz And 5 GHzIf your device does not support 5 GHz, the network will be unavailable.
• 🚫 MAC filtering: Your router settings may have a "whitelist" of devices enabled. Check the section Wireless → MAC Filter.
• 🔄 Firmware update: Outdated firmware can cause problems. Update it through the router's web interface (usually in the "Programs" section). System Tools → Firmware Upgrade).

To access your router settings, enter one of the following addresses in your browser's address bar: 192.168.0.1, 192.168.1.1 or tplinklogin.net (For TP-Link).

The default login and password are usually admin/admin or indicated on the device sticker.

4. Device conflicts: Windows, Android, iOS

Sometimes the problem isn't with the router, but with the device itself, which can't connect to the network. Let's look at typical scenarios for different platforms.

🖥️ Windows 10/11

• ⚙️ Reset network settings: open Settings → Network & Internet → Network reset and press Reset now.
• 🔧 Wi-Fi driver: Updating or rolling back the adapter driver may solve the problem. Find it in Device Manager (chapter Network adapters).
• 🛡️ Firewall or antivirus: temporarily disable them and check if the Internet is available.

📱 Android

• 🔄 Forget the network: In Wi-Fi settings, tap on your network → Delete (or Forget), then reconnect.
• 📱 Airplane mode: Turn it on and off - this will reset the network modules.
• 🔋 Battery saving: some phones (eg Xiaomi or Samsung) Wi-Fi is turned off in the background. Check the power saving settings.

🍎 iOS (iPhone/iPad)

• ⚙️ Reset network settings: Settings → General → Transfer or reset iPhone → Reset → Reset Network Settings.
• 🔄 iOS update: An outdated system version may conflict with new Wi-Fi standards (for example, Wi-Fi 6).

If none of these solutions help, try connecting to a different network (for example, a mobile data plan). If problems persist, the device, not the router, is to blame.

5. Network interference and congestion: how to improve the signal

Even if the router is working properly, signal quality may worsen due to external factors:

• 📡 Congested channel: if you and your neighbors have the same channel 2.4 GHz, there will be interference. Use apps like Wi-Fi Analyzer (Android) or NetSpot (Windows/macOS) to find a free channel.
• 🏢 ObstaclesWalls, furniture, and even aquariums weaken the signal. The optimal location for the router is in the center of the apartment at a height of 1–1.5 meters.
• 🔌 Electrical appliances: Microwaves, cordless phones and baby monitors operate on a frequency 2.4 GHz and create interference. Switch to 5 GHz, if your devices support it.
• 👨‍👩‍👧‍👦 Many connected devices: If more than 10 devices are connected to the router at the same time, the speed drops. Limit the number of devices or configure QoS (Quality of Service) in the router.

For larger homes or offices, consider installing Mesh systems (For example, TP-Link Deco or Google Nest Wi-Fi) or repeater (signal repeaters). They automatically switch devices between access points, ensuring stable coverage.

How to choose a free Wi-Fi channel

Open the app Wi-Fi Analyzer on Android. Go to the tab Channel Graph. Channels with the fewest overlapping graphs are the freest. In the router settings (Wireless → Channel) select this channel and save the changes.

6. Viruses, attacks and blocking: hidden threats

Rarely, but accurately: sometimes Wi-Fi does not work because external interventionHere's what might happen:

• 🦠 Viruses on the deviceSome Trojans change network settings or block internet access. Check your system with an antivirus (e.g., Kaspersky Internet Security or Malwarebytes).
• 🕵️ MITM attackIf you're connected to a public network (at a cafe or airport), an attacker could have spoofed your DNS. Check your adapter settings—they should be correct. 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare).
• 🚫 Parental control: if you have it set up at home Parental Control (for example, on routers ASUS or Netgear), Internet access can be blocked according to a schedule.
• 🔒 Provider blocking: some providers (eg MGTS) block access to certain websites. Check using a VPN (for example, ProtonVPN).

If you suspect your router has been hacked, immediately reset it and change the administrator password to a complex one (at least 12 characters with numbers and special characters).

⚠️ Attention: if unknown forwarding rules appeared in the router settings (Port Forwarding) or the DNS server has been changed, this is a sign of hacking. Update the firmware and change all passwords.

7. Specific problems: Smart TV, printers, game consoles

Some devices have unique issues when connecting to Wi-Fi. Let's look at the most common ones.

📺 Smart TV (Samsung, LG, Sony)

• 🔄 Network reset: press on the remote control Home → Settings → Network → Network Reset.
• 📶 Unsupported standard: old televisions (eg Samsung Series 5 2012) don't work with Wi-Fi 6Switch the router to the mode 802.11n.
• ⏳ Long connectionIf the TV takes more than 5 minutes to "think," check your time settings. An incorrect date may be blocking access.

🎮 Game consoles (PS5, Xbox, Nintendo Switch)

• 🎯 NAT type: needed for online games NAT Type 2If you have Type 3, open the ports 80, 443, 3478-3480 in the router settings.
• 🔌 Wired connection: for stable ping in Call of Duty or Fortnite It is better to use an Ethernet cable.

🖨️ Printers and MFPs (Canon, HP, Epson)

• 📡 WPS connection: many printers (eg HP OfficeJet) only support connection via WPS. Click the button WPS on the router within 2 minutes after turning on the printer.
• 🖥️ DriversWithout the correct drivers, the printer won't find the network. Download them from the manufacturer's official website.

For these devices it often helps manual IP configuration. Set a static IP in the range of your local network (for example, 192.168.1.100) and specify it in the device settings.

8. When to call a technician: signs of serious problems

If you've tried everything and your Wi-Fi still isn't working, the problem may require professional attention. Contact a professional if:

• ⚡ The router does not turn on: no indication, power supply is hot or smells like burning.
• 📡 The antennas are damaged: visible cracks, broken connectors or corrosion.
• 🔌 The WAN port is not working.: even with a direct cable connection to the PC, there is no Internet.
• 🔄 Constant outages: The network drops every 5-10 minutes and none of the above tips helped.
• 🛠️ Soldering is required: if diagnostics revealed a problem with the microcircuits (for example, the Wi-Fi controller burned out).

The cost of router repair depends on the fault:

- Power supply replacement: ~500–1000 ₽.

- Repair of ports or antennas: ~1500–3000 ₽.

- Replacing microchips: ~2000–5000 ₽ (sometimes it’s cheaper to buy a new router).

⚠️ AttentionIf your router is under warranty, do not disassemble it yourself! This will void the warranty. Contact the manufacturer's service center.

FAQ: Frequently asked questions about Wi-Fi not working

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

Most likely, the problem lies with your laptop's network adapter settings. Try:

1. Update Wi-Fi driver via device Manager.
2. Reset network: Settings → Network & Internet → Network reset.
3. Disable VPN or proxy if enabled.

If that doesn't help, check your laptop for viruses—some of them block internet access.

🕒 My Wi-Fi keeps disconnecting every 5 minutes. What's wrong?

The reasons may be different:

• Energy saving: in the adapter settings (Device Manager → Network Adapters → Properties → Power Management) uncheck Allow the computer to turn off this device to save power.
• The router is overheating: if it is hot, let it cool down or move it to a ventilated area.
• DHCP failure: enable it in your router settings Always distribute the same IP (option DHCP Reservation).

🔐 How do I know if my router has been hacked?

Signs of hacking:

• Unknown devices in the list of connected devices (DHCP Clients List in the router settings).
• Changed DNS servers (not 8.8.8.8 or provider addresses).
• Unusual rules in Port Forwarding or DMZ.
• The router slows down or reboots spontaneously.

If you find anything suspicious, reset your router to factory settings and change the administrator password.

📶 Why does Wi-Fi only work near the router?

This is a sign of a weak signal. Solutions:

• Change the channel to 5 GHz (less interference, but worse penetration through walls).
• Install a repeater or mesh system to expand coverage.
• Check the transmission power in the router settings (option Transmit Power) - set to 100%.
• Replace the antennas with more powerful ones (for example, TP-Link TL-ANT2408CL).

🔧 Is it possible to fix a router yourself?

If the problem is software-related (settings lost, firmware outdated), then yes. But if the problem is hardware-related (a burned-out chip, a damaged port), you won't be able to fix it without a soldering iron and experience. Risks:

• Damage the board during disassembly.
• Make the problem worse (e.g. short-circuit the contacts).
• Void the warranty.

For beginners, it's safer to take the router to a service center.