Why Wi-Fi won't turn on on my Samsung phone and how to fix it

You are trying to connect to a wireless network, but the button Wi-Fi on yours Samsung Galaxy Is the module not responding to inputs or refusing to turn on? This problem is more common than you might think, according to budget owners. Galaxy A-series to flagships S23 UltraThe reasons may lie in both a simple software glitch and serious hardware malfunctions of the antenna module.

In this article, we will look at all possible scenarios: from simple solutions like rebooting the device to diagnostics service menu and integrity checks WCNSS_qcom_cfg.ini — a configuration file responsible for the operation of wireless modules. You'll also learn how to distinguish a software glitch from a physical failure, and when it's time to contact a service center. Samsung.

Important: If the problem occurred after the phone was dropped, got wet, or was disassembled on its own, immediately proceed to the section about hardware malfunctionsIn 90% of such cases, repairs will be required.

Typical Symptoms of Non-Working Wi-Fi on Samsung Devices

Before you begin diagnosing, determine how the problem manifests itself. Here are key signs that will help narrow down the possible causes:

• 🔄 The Wi-Fi button is inactive — the gray switch in the notification panel or settings does not respond to touch.
• 🔍 The module turns on but does not find the network. — the indicator is on, but the list of available access points is empty.
• 🔗 The connection is broken — the phone connects to the network, but after a few seconds the connection is lost.
• ⚡ High battery consumption — If the Wi-Fi module constantly tries to connect, this can lead to overheating and rapid battery drain.
• 📱 Authentication error — the phone sees the network, but when connecting it displays the message "Saved, WPA/WPA2 protection".

Please pay special attention to error messagesFor example, the code ERROR_NO_NETWORK in the system logs (*#9900#) often indicates problems with the module driver, and ERROR_AUTHENTICATION_FAILED — incompatibility of the router and phone security settings.

Software causes: from crashes to viruses

In 70% of cases, software is the culprit. Let's start with the simplest and most harmless causes that can be resolved independently.

1. Android system crash

Even on flagship models Samsung Galaxy S22 or Z Fold 4 sometimes they arise service process hangs, responsible for managing wireless modules. Signs:

• 🛑 Wi-Fi turns on, but then turns off immediately.
• 🔄 The "Turning on..." message is displayed indefinitely in the settings.
• 📵 The Wi-Fi icon in the notification bar blinks and disappears.

Solution:

1. Do it forced reboot: hold down the buttons Power + Volume Down for 10-15 seconds.
2. If it doesn't help, switch your phone to safe mode (press Nutrition, then hold "Power off" until the option appears. Safe mode disables all third-party applications.
3. Check your Wi-Fi. If the module works, one of your installed apps is to blame (most often VPN clients or network optimizers).

2. Conflict after software update

One UI updates to versions 5.1 and 6.0 often break Wi-Fi on 2020-2022 models (Galaxy S20, Note 20, A52)This manifests itself like this:

• 🔄 The module turns on, but cannot connect to any network.
• 📡 In the router settings, the phone appears connected, but there is no internet.
• 🔧 A notification appears stating "Wi-Fi is disabled due to a network error."

Solutions:

Clear the system cache in Recovery|Roll back the update via Smart Switch|Reset network settings|Update the firmware manually via Odin-->

To clear the cache:

1. Turn off your phone.
2. Clamp Power + Volume Up + Bixby (on new models - Power + Volume Up/Down).
3. On the menu Recovery select Wipe cache partition.
4. Restart your device.

⚠️ Attention: If after updating to Android 14 Wi-Fi is gone Galaxy S21 or older - check for the patch in Settings → Software Update. Samsung released fixes for this issue in March 2026.

3. Viruses and malware

Some Trojans (for example, Android.WiFiStealer) block wireless modules to redirect traffic through attacker proxy servers. Signs of infection:

• 🛡️ The antivirus issues warnings about suspicious activity.
• 📥 Unknown applications suddenly appear in the menu.
• 🔄 Wi-Fi turns on, but traffic goes through unknown IPs (checked via Settings → Connections → Data Usage).

What to do:

1. Install Malwarebytes or Kaspersky Mobile and perform a deep scan.
2. Remove suspicious applications (especially those with permissions) ADMIN or VPN).
3. Reset your phone to factory settings if viruses are not removed.

Incorrect phone or router settings

Sometimes the problem is not with the phone, but with a conflict between the settings Samsung and your router. Scenarios considered.

1. Incompatible network parameters

If your Galaxy won't connect to Wi-Fi but other devices work fine, check:

How to change router settings:

1. Open your router's web interface (usually 192.168.0.1 or 192.168.1.1).
2. Go to the section Wireless Settings or Wi-Fi.
3. Set the recommended parameters from the table above.
4. Save the settings and reboot the router.

⚠️ Attention: On some routers TP-Link And ASUS mode is on 11ax (Wi-Fi 6) Only, which is not supported by older models Samsung (to Galaxy S10). Switch to mixed mode 11ac/ax.

2. Errors in phone settings

Even if the router is configured correctly, in reality Samsung Wi-Fi blocking features may be activated:

• 🔄 Power saving mode — limits the operation of wireless modules. Disable it. Settings → Device Care → Battery → Power Saving Mode.
• 📡 Smart Wi-Fi Switching — automatically turns off Wi-Fi when the signal is weak. Deactivate in Settings → Connections → Wi-Fi → Advanced.
• 🔒 VPN or proxy — Some VPN services block local connections. Check in Settings → Connections → Other settings → VPN.
• 📱 Airplane mode Even if it's turned off, sometimes stuck settings remain. Try turning airplane mode on and off again.

3. MAC address conflict

Some routers (especially corporate ones) use MAC address filtering. If your Samsung can't connect to the network at the office or university:

1. Find out your MAC address: Settings → About phone → Status → Wi-Fi status → MAC address.
2. Please report it to your network administrator to be added to the whitelist.
3. If filtering is not used, try reset MAC address (requires root rights or service menu).

Hardware malfunctions: when a repair shop is needed

If software methods do not help, the problem may lie in physical damage phone components. Here are the key signs of hardware failure:

• 🔧 Wi-Fi doesn't turn on at all — the switch is grey, no response to pressing.
• 📡 Bluetooth is gone - If Bluetooth has stopped working along with Wi-Fi, it's most likely broken. combination chip (For example, Broadcom BCM4358 V Galaxy S20).
• 🔥 The phone is overheating in the area of ​​the upper part of the case (where the Wi-Fi antenna is located).
• 💧 Moisture ingress — If the phone has fallen into water or has been in a humid environment, oxidation of the antenna contacts may lead to signal loss.
• 📉 Problems arose after the fall — even a minor impact can damage the soldered connections of the antenna module.

To diagnose hardware problems:

1. Check it out service menu:

   #0#

   In the test WiFi Try enabling the module. If the test returns an error FAIL — it's a hardware problem.

2. Use the app Phone INFO ★Samsung★ from Google Play. In the section Wi-Fi Check the module status. If the field Wi-Fi driver status shows unloaded — the driver does not load (possibly due to chip damage).
3. Disassemble the phone (if you have experience) and check:
   • Integrity antenna loops (often recover after falls).
   • Oxidation of contacts on motherboard (green plaque).
   • Swelling or damage Wi-Fi/Bluetooth chip (usually labeled as Murata, Broadcom or Qualcomm).

⚠️ Attention: On models Galaxy S21+ and newer Wi-Fi chip is integrated into the main processor (Exynos 2100 or Snapdragon 888). Replacing it requires resoldering the entire CPU, which costs 60-80% of the price of a new phone. In such cases, it makes more economic sense to consider purchasing a new device.

How to test a Wi-Fi antenna without disassembling it?

Download the app Network Signal Info and compare the Wi-Fi signal strength (in dBm) with other devices in the same location. If your Samsung the signal is 20-30 dBm weaker - most likely the problem is in the antenna or cable.

Problems with firmware and drivers

Sometimes Wi-Fi stops working due to corruption in the system files responsible for wireless modules. This can happen after:

• 🔄 Failed software update.
• 📱 Installing custom firmware (LineageOS, Pixel Experience).
• 🔧 Incorrect factory reset.
• 🛠️ Using tools like TWRP or Odin.

How to diagnose:

1. Check the integrity of the file WCNSS_qcom_cfg.ini (responsible for configuring Qualcomm Wi-Fi/Bluetooth modules). To do this:

adb shell ls /vendor/firmware_mnt/image/WCNSS_qcom_cfg.ini

2. If the file is missing or damaged, it must be restored from the original firmware.
3. Check the system logs for driver errors:

   adb logcat | grep -i"wifi\|wlan"

   Errors like E/WifiHW: Failed to load driver! indicate problems with the firmware.

Solutions:

Download the original firmware for your model from SamMobile|Flash through Odin (BL, AP, CP, CSC files)|Perform a reset via Wipe Data/Factory Reset in Recovery|Check file integrity after flashing-->

For flashing via Odin:

1. Download the firmware for your model (for example, SM-G991B For Galaxy S21).
2. Unzip the archive and run Odin (version 3.14.4 and higher).
3. Connect your phone in mode Download Mode (press Power + Volume Down + USB Cable).
4. Upload files to the appropriate fields (BL, AP, CP, CSC).
5. Click Start and wait until it is finished (do not disconnect the cable!).

⚠️ Attention: Flashing unofficial software or files from another model may result in complete loss of IMEI and blocking network modules (including cellular communications). Always check the model and firmware version.

Diagnostics via service codes and logs

For deep diagnostics of the Wi-Fi module on Samsung You can use hidden service menus and system logs. Here are the key commands and their explanations:

Example of log decryption from *#9900#:

[WiFi] E/WifiStateMachine: Failed to load Wi-Fi driver: -1
[WifiHW] E/WifiNative: Unable to open firmware file: WCNSS_qcom_wlan_nv.bin

Such errors indicate:

• Damage to the Wi-Fi module firmware files.
• Driver incompatibility with Android kernel version.
• Hardware failure of the chip (if the files are in place, but the driver does not load).

Quick Guide: What to Do First

To save time, follow this algorithm:

1. Restart your phone - this solves 30% of problems with "frozen" modules.
2. Check your router:
   • Reboot it (pull the plug for 30 seconds).
   • Make sure Wi-Fi is not scheduled to turn off.
   • Try connecting to a different network (for example, share the Internet from another phone).
3. Reset network settings:

   Settings → General → Reset → Reset network settings

4. Update your software:

   Settings → Software Update → Download and Install

5. Check the hardware:
   • Inspect the phone for damage.
   • Check Bluetooth operation (if it doesn’t work either, the problem is in the chip).

Contact the service, If:

• Wi-Fi does not turn on at all (gray switch).
• The problem appeared after a fall or exposure to moisture.
• Both Wi-Fi and Bluetooth are not working.

Frequently asked questions

My Samsung Galaxy A52 can't see 5 GHz networks, only 2.4 GHz. What's wrong?

This is a typical problem for budget models. Samsung with chips Qualcomm Snapdragon 720G/750GPossible reasons:

• 📡 In your country 5 GHz band is disabled for some channels (check your router settings to see which channels are allowed).
• 🔧 On the phone 5 GHz support is disabled at the software level (check in *#2263#, there must be a point 5GHz).
• 📱 Regional restrictions — Some models (for example, for the Indian market) do not support 5 GHz. Check the CSC code in Settings → About phone → Software information → Service code.

Solution: Update the software to the latest version or try changing the region through the app SamKey (requires root).

After updating to Android 14, Wi-Fi on my Galaxy S21 disappeared. What should I do?

This is a known issue with the drivers for the chip. Exynos 2100. Samsung released patches in March and May 2026. Your actions:

1. Check for updates in Settings → Software Update.
2. If there are no updates, reset your network settings (Settings → General → Reset → Reset network settings).
3. If it doesn't help, roll back to the previous version of the software via Smart Switch (backup needed).

In extreme cases, contact the service center - they can reflash the module through UFS-programmer.

The phone sees the network but won't connect—it says "Saved, WPA/WPA2 security." How can I fix it?

This error occurs due to incompatible security settings. Here's what to do:

1. On your router, change the security type from WPA3 on WPA2-PSK.
2. Make sure it is turned off on your phone. Smart Wi-Fi Selection (Settings → Wi-Fi → Advanced).
3. Remove the network from your saved ones and reconnect.
4. If used corporate network (WPA2-Enterprise) - Check certificates in Settings → Security → Other security settings → Installed certificates.

If the problem persists, reset your router to factory settings.

Is it possible to fix Wi-Fi on a Samsung device yourself if it won't turn on?

It depends on the reason:

• ✅ Software glitch - Yes, you can reflash the phone through Odin or reset the settings.
• ✅ Oxidation of antenna contacts — If you have experience, you can carefully clean it with alcohol and a brush.
• ❌ Damage to the Wi-Fi chip - soldering equipment and a donor chip are required (not recommended without experience).
• ❌ Broken tracks on the board — professional soldering under a microscope is required.

For models older than 3 years, self-repair may not be practical—the cost of parts and the risk of damaging the board often outweigh the value of the phone.

How much does it cost to repair a Wi-Fi module at a Samsung service center?

The cost depends on the model and type of breakdown:

Phone model	Type of repair	Estimated cost (2026)
Galaxy A13/A33/A53	Replacing the antenna cable	1 500 — 2 500 ₽
Galaxy S21/S22	Resoldering the Wi-Fi chip	5 000 — 8 000 ₽
Galaxy Z Flip4/Fold4	Replacing the flexible cable with antenna	7 000 — 12 000 ₽
Galaxy S23 Ultra	Diagnostics + module replacement	10 000 — 15 000 ₽

Prices are for authorized service centers. Samsung In Moscow and St. Petersburg. In the regions, the cost may be 15-20% lower. Warranty repairs (if the phone is under warranty) are free, but may take up to 21 days.