How to check if your Wi-Fi module is working: a complete diagnostic in 10 minutes

You turned on your router, but the device stubbornly refuses to detect the network? Or the connection keeps dropping, even though other devices are working smoothly? The first thing that comes to mind is a malfunction. Wi-Fi moduleBut before you take your laptop to a service center or buy a new USB adapter, it's worth making sure that the problem lies with the adapter itself.

In this article - 7 Proven Ways to Diagnose a Wi-Fi Module on any device: from a simple visual inspection to in-depth tests using the command line. We'll discuss how to distinguish a software glitch from a hardware failure, which errors indicate a faulty module, and what to do if it's truly "dead." These instructions are suitable for Windows 10/11, macOS, Linux, Android and even for built-in modules in Smart TV.

Important: If your device has never connected to Wi-Fi (for example, a new laptop or after a motherboard replacement), first check that the module isn't disabled in the BIOS/UEFI. This is covered in one of the sections below.

1. Visual inspection: physical signs of malfunction

Before messing with the settings, inspect the device. Some signs of malfunction Wi-Fi adapter visible to the naked eye:

• 🔴 Wi-Fi indicator Doesn't light up or blinks red (on laptops and USB adapters). Normal mode is blue/green light or steady glow.
• 🔌 Antenna connector has come loose or is damaged (relevant for PCs with PCIe modules). Antennas are connected to the connectors MHF4 or IPEX - if the contact is broken, the signal will be weak or absent.
• 💥 Swollen capacitors or traces of oxidation on the module's board (visible when disassembling the laptop). A common problem with older devices. Dell, HP And Asus 2010–2015.
• 🔧 Physical damage: cracks in the USB adapter casing, bent contacts on the PCIe card, or traces of liquid inside the laptop.

On MacBook and some ultrabooks Lenovo/Acer The Wi-Fi module may be soldered to the motherboard. In this case, visual inspection without disassembling it is impossible; you'll have to rely on software tests.

⚠️ Attention: If you notice traces of corrosion or burnt plastic Near the Wi-Fi module, do not turn on the device until repaired. This may indicate a short circuit that will damage other components.

2. Check in Device Manager (Windows)

The fastest way to find out if the Wi-Fi module is recognized by the system is to look in device ManagerHere's how to do it:

1. Click Win + X and select device Manager.
2. Expand the branch Network adapters.
3. Find the device with the names Wireless, Wi-Fi, 802.11 or the manufacturer's brand (Intel, Qualcomm Atheros, Broadcom, Realtek).

What could the absence or errors in the list mean:

If the adapter is in the list, but still does not pick up the network, try roll back the driver (right click → Properties → tab Driver). Sometimes updates from Microsoft break compatibility with some modules (especially Realtek And Broadcom).

Check the "Network Adapters" branch | Search for the Wi-Fi module by keywords | Make sure there are no exclamation marks | Try updating/rolling back the driver -->

3. Diagnostic commands in Windows (CMD and PowerShell)

If visual inspection and Device Manager don't yield results, use the command line. These commands will help you check, Does the system see the Wi-Fi module? and are there any conflicts?

Open Command line (Win + R → enter cmd) or PowerShell as administrator and run the following in turn:

netsh wlan show drivers

Look for the lines:

• Radio type — it should be 802.11n, 802.11ac or 802.11ax (Wi-Fi 4/5/6). If here Absent, the module is faulty or disconnected.
• Hosted network support — Yes (If No, the adapter cannot distribute Wi-Fi).

netsh wlan show interfaces

Here's what to pay attention to:

• State — it should be Connected or Ready (if not connected to the network).
• Signal - If 0%, the module does not catch the network.

If both commands return an error Failed to execute command or WLAN AutoConfig service is disabled, execute:

sc config Wlansvc start= auto
net start Wlansvc

⚠️ Note: On some laptops Lenovo And HP service Wlansvc may be blocked by proprietary software (for example, Lenovo Vantage). In this case, the only solution is to reinstall the system or reset to factory settings.

4. Check on macOS (Terminal)

On MacBook And iMac Wi-Fi module diagnostics are carried out through Terminal. Open it (Cmd + Space → enter Terminal) and run:

networksetup -listallhardwareports

Find the section Wi-Fi or AirPort (on older Macs). If it's not there, the module isn't recognized by the system. If it is there but there's no network connection, check:

system_profiler SPNetworkDataType

Look for the lines:

• Interface: en0 (or en1) is your Wi-Fi adapter.
• Supported PHY Modes — must be 802.11a/b/g/n/ac/ax (depending on the model).
• Status: Inactive — the module is disabled (check System Preferences → Network).

If the adapter is present but not working, reset the network settings:

sudo ifconfig en0 down
sudo ifconfig en0 up

(replace en0 to your interface from the output of the previous command).

On Mac with chips Apple Silicon (M1/M2) The Wi-Fi module is integrated into the processor. If it doesn't work, it may indicate problems with SMC (power management system). Try resetting it:

1. Shut down your Mac.
2. Clamp Control + Option + Shift for 7 seconds, then add the power button and hold for the full 7 seconds.
3. Release and turn on your Mac.

5. Diagnostics on Linux (terminal)

IN Ubuntu, Debian, Fedora and other distributions, checking the Wi-Fi module comes down to a few commands. Open the terminal (Ctrl + Alt + T) and enter:

lspci | grep -i network

For PCIe modules (laptops, PCs) or:

lsusb

For USB adapters, look for lines with Wireless, Wi-Fi or chip names (Ralink, Atheros, Intel).

If the module is detected, check its status:

iwconfig

There should be a section in the output wlan0 (or wlp3s0 etc.) with status. Please note:

• IEEE 802.11 — supported standards.
• Mode:Managed - normal mode (if Monitor, module in scanning mode).
• Access Point: Not-Associated — not connected to the network.

If the adapter is not displayed, try loading the kernel module manually. For example, for chips Realtek RTL8188EU:

sudo modprobe 8188eu

For Intel:

sudo modprobe iwlwifi

⚠️ Note: On some distributions (e.g. Arch Linux) Wi-Fi may not work due to the lack of proprietary software (firmware). Install the package linux-firmware via package manager.

6. Testing on Android and iOS

On mobile devices, Wi-Fi module diagnostics are limited, but there are several ways to check its functionality.

On Android:

1. Open Settings → Wi-Fi.
2. Enable developer mode: Settings → About phone → Build number (press 7 times).
3. Return to Settings → System → Developer Options and find Wireless Network Monitor.
4. If the option is missing or returns an error when turned on, the module is faulty.

You can also use apps like WiFi Analyzer (available in Google PlayIf the app doesn't see any networks, but other devices can connect to your router, the problem is with the module.

On iPhone/iPad:

• 📱 Go to Settings → Wi-FiIf the switch is gray and inactive, the module is disabled or faulty.
• 🔄 Try resetting your network settings: Settings → General → Transfer or reset → Reset → Reset network settings.
• 🛠️ If Wi-Fi doesn't work after the reset, check if the light is on liquid indicator in the SIM card slot (on iPhone (with a physical SIM card). Moisture often disables both Wi-Fi and Bluetooth.

On iPhone 12/13/14 Newer devices have Wi-Fi and Bluetooth integrated into a single chip. If both don't work, it's almost a 100% guarantee of hardware failure.

How to check Wi-Fi on a smartphone without a SIM card?

Even without a SIM card, your smartphone should see available Wi-Fi networks (if the module is working properly). Connect to any open network (for example, at a cafe) or create a hotspot on another device. If your smartphone can't find any networks, the problem is with the module or antenna.

7. Hardware tests: what to do if software diagnostics didn't help

If all the previous methods have not revealed any problems, but Wi-Fi is still not working, it's time hardware tests:

• 🔄 Connect an external USB adapterIf it works, the built-in module is faulty. Any adapter (for example, TP-Link TL-WN725N).
• 🔧 Check the antennasOn laptops, Wi-Fi antennas are often located under the keyboard or screen. If they are pinched or damaged, the signal will be weak or absent.
• 🔋 Test with a different power supplyInsufficient power (especially on a PC) can cause the USB port or PCIe slots to which the Wi-Fi module is connected to to shut down.
• 🔥 Check the heating. Overheating of the Wi-Fi chip (for example, on MacBook Pro 2016–2018) may cause the module to be disabled. Use HWMonitor (Windows) or iStat Menus (macOS) for temperature monitoring.

For PCIe modules (Desktop PCs) You can check its functionality by connecting it to another computer. If the module isn't detected there either, it's burned out. A common cause is power surges or static electricity during installation.

On laptops Dell Latitude And HP EliteBook The Wi-Fi module can be blocked via BIOS on whitelist (whitelist). In this case, even a functioning module from another manufacturer will not work. Check compatibility on the manufacturer's website.

Frequently Asked Questions (FAQ)

My laptop can't see the Wi-Fi network, but Bluetooth works. What does this mean?

Wi-Fi and Bluetooth often share the same chip but operate independently. If Bluetooth is present but Wi-Fi isn't, the problem may be:

• Disconnected Wi-Fi antennas (they may be damaged or disconnected).
• Driver failure only for Wi-Fi (Bluetooth uses a different driver).
• Hardware failure Wi-Fi parts only chip (for example, on Intel AX200).

Try updating the driver or connecting an external adapter for testing.

Wi-Fi stopped working after a Windows update. What should I do?

This is a classic problem, especially with adapters. Realtek And BroadcomSolutions:

1. Roll back the driver: Device Manager → Network Adapters → Driver Properties → Roll Back Driver.
2. Remove the driver and install it from the laptop manufacturer's website (not from Windows Update!).
3. If nothing helps, roll back the system to a restore point before the update.

On Windows 11 Sometimes disabling the function helps Automatic control of radio frequency parameters V Settings → Network → Wi-Fi → Manage known networks.

How to test the Wi-Fi module on a Smart TV?

On TVs Samsung, LG, Sony And Xiaomi diagnostics are limited, but it is possible:

• Log in Settings → Network → Network StatusIf the TV doesn't find any networks, the problem is in the module.
• Connect the TV to the router via cable. If the internet works, then only the Wi-Fi is faulty.
• Reset network settings: Settings → Support → Self-diagnosis → Reset.

On Android TV (For example, Philips or Xiaomi Mi TV) can be installed Analiti or WiFi Analyzer from Google Play for verification.

Is it possible to repair a burnt-out Wi-Fi module?

In 90% of cases, no. Wi-Fi modules are microchips with antennas, and if they burn out (for example, from a power surge), they cannot be repaired. Exceptions:

• If the problem is contacts (for example, the antennas have come loose) - they can be soldered.
• If only it burned out USB port, to which the external adapter is connected - the port can be replaced.
• On some laptops (ThinkPad, Dell Latitude) the module is removable and can be replaced with a new one (cost - 1-3 thousand rubles).

On MacBook with soldered modules (for example, MacBook Air M1) repairs are only possible at a service center Apple and will cost 10-30 thousand rubles.

How do I find out the model of my Wi-Fi module?

The methods depend on the device:

• Windows: Device Manager → Network Adapters → Properties → Hardware IDs (look for lines VEN_XXXX And DEV_XXXX).
• macOS: System Information → Network → Wi-Fi.
• Linux: lspci -v | grep -i network or lsusb.
• Android: Apps like DevCheck or AIDA64.
• Laptop/PC: Disassemble the device - the model is usually written on the module sticker (for example, Intel Wireless-AC 9560).