Wi-Fi and Bluetooth won't turn on on my Samsung: Full diagnostics and repair

Have you encountered a situation where your smartphone or tablet Samsung stopped working Wi-Fi And Bluetooth At the same time? This isn't a coincidence—such symptoms almost always indicate a system problem, not a random glitch. Software errors are to blame in 80% of cases, but sometimes hardware issues arise that require service center intervention.

In this article we will look at the unique relationship between Wi-Fi and Bluetooth modules in Samsung devicesWhy do they often fail in pairs, how to distinguish a software glitch from a physical failure, and what to do if standard methods (rebooting, resetting) don't help. We'll pay special attention to the following models: Galaxy S22/S23, A54/A73 And Tab S8/S9, where the problem most often appears due to the peculiarities of the chipset Exynos or Snapdragon.

Before taking your phone in for repair, run through our proven diagnostics—it'll save you time and money. And if you've already tried everything possible, at the end of the article you'll find some rare solutions you won't even find on forums.

1. Why do Wi-Fi and Bluetooth fail at the same time?

At first glance it may seem that Wi-Fi And Bluetooth — these are two independent modules. However, in devices Samsung (as in most modern smartphones) they are often integrated into one chip - the so-called combo-chip (For example, Broadcom BCM4375 or Qualcomm WCN6855). This means that a breakdown or failure in one component automatically disables the second.

The main reasons for paired refusal:

• 🔧 Software conflict: Firmware error, especially after an update Android or One UI. Often found on Galaxy S21/S22 after upgrading to Android 14.
• ⚡ Hardware failure: Overheating, falling, or moisture damage that damaged the antenna module or contacts on the motherboard.
• 📱 Reset network settings: Incorrect restore from backup or factory reset without deleting old configurations.
• 🔋 Energy saving: Aggressive battery optimization settings that disable background processes, including wireless modules.

Interesting fact: on some models Samsung (For example, Galaxy A52 And A72) Wi-Fi and Bluetooth are controlled via the same driver in the core LinuxIf the driver crashes, both modules stop responding. This can be verified via adb logcat, but more on that later.

2. Diagnostics: How to understand what the problem is?

Before starting repairs, you need to accurately determine the source of the problem. Here's a step-by-step diagnostic plan:

1. Check for physical damage: Inspect the case for cracks, dents or signs of moisture (indicators Liquid Damage Indicator (usually turn red). The antenna connectors located near the bottom edge of the device are especially vulnerable.
2. Test in safe mode: Press and hold the power button Shutdown → click Safe modeIf Wi-Fi/Bluetooth works in this mode, a third-party app is to blame.
3. Checking through the engineering menu: Enter the code #0011# (for Wi-Fi) or #232338# (for Bluetooth). If the menu doesn't open or displays errors, the problem is firmware or hardware-related.
4. System logs: Connect the device to the PC and run the command:

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

   Errors of the form E/WifiHW : Failed to load driver or E/bt-btif : BTIF init failed will indicate a driver failure.

If none of the methods worked, move on to the next section, where we'll discuss hardware and software solutions.

3. Software solutions: from simple to complex

In 60% of cases, the problem can be resolved without disassembling the device. Start with the safest methods and gradually move on to more radical ones.

3.1. Resetting network settings

This is the first step that is often ignored. Go to: Settings → General Management → Reset → Reset Network Settings.

After the reset, your phone will reboot and all saved Wi-Fi networks, Bluetooth device passwords, and VPN settings will be deleted. Important: if you use Samsung Knox or a corporate profile, this method may block some features - check beforehand.

3.2. Clearing cache and data of system applications

Sometimes the cache for Wi-Fi and Bluetooth modules gets corrupted. Clear it for the following apps (path: Settings → Apps → [⋮] → Show system):

• 📡 com.android.bluetooth (Bluetooth)
• 📶 com.android.wifi (Wi-Fi)
• ⚙️ com.samsung.android.providers.settings (Samsung Settings)

3.3. Updating or downgrading firmware

If the problem appeared after the update One UI, try:

1. Update to the latest version via Settings → Software Update.
2. If the update doesn't help, roll back to the previous version using Odin (instructions for experienced users).

Warning: Firmware rollback may result in blocking Knox and voiding the warranty. Use this method only if other methods have failed.

4. Hardware malfunctions: when repairs are essential

If software methods don't work, the problem is most likely hardware-related. Here are the most common hardware causes:

If you are not a microelectronics expert, do not attempt to repair the device yourself - modern smartphones Samsung They have multilayer circuit boards with microscopic contacts. Contact a service center, first confirming whether they work with your model (some repair shops refuse to repair flagship models due to the complexity).

What happens if you resolder the chip yourself?

Without specialized equipment (soldering station, microscope, BGA rework), you risk permanently damaging the board. In 90% of cases, home-made repairs result in complete device failure.

5. Rare causes and non-obvious solutions

If standard methods don't help, check these nuances—they're often missed even by experienced professionals.

5.1. SIM card conflict

On some models Samsung (For example, Galaxy S20 FE And Note 20The SIM card and Wi-Fi module share the same power circuit. If the SIM card is damaged or incorrectly installed, it may block the wireless modules from working.

SolutionRemove the SIM card, clean the tray contacts with alcohol, and restart the device. If Wi-Fi/Bluetooth is working again, replace the SIM card.

5.2. Malfunction eSIM

If you use eSIM, its profile could conflict with the wireless module drivers. This is a known issue on Galaxy S22+ And S23 Ultra.

Solution: Delete eSIM-profile through Settings → Connections → SIM cards → eSIM and reboot your device.

5.3. Influence DeX or Link to Windows

Functions Samsung DeX And Link to Windows Wireless modules sometimes block if they are interrupted during operation. This is because they use the same drivers for data transfer.

Solution: Disable these features in settings and perform a network reset.

6. Prevention: How to avoid recurring failures

To prevent the problem from returning, follow these recommendations:

• 🔄 Update your firmware regularly, but don't install betas unless you're prepared for bugs.
• 🛡️ Use impact-resistant cases—even a slight fall can dislodge the antenna module.
• 🚫 Avoid "optimizers" and "cleaners" from Play Market - they often conflict with system services.
• 🔋 Do not discharge the battery to 0% - this may cause malfunctions in the power controllers that control the wireless modules.

If your device frequently overheats, install a temperature monitoring app (e.g. CPU Monitor) and monitor the indicators. The critical temperature for Exynos-chips — 65°C, For Snapdragon — 70°CIf these values ​​are exceeded, Wi-Fi and Bluetooth may be automatically disabled for protection.

7. When should I contact the service center?

If you've tried all the methods in this article and your Wi-Fi and Bluetooth still aren't working, it's time to call a professional. Here are signs that the problem is more serious than it seems:

• 🔴 The device is not responding *#0011# or other engineering codes.
• 🔴 In logcat errors of the type appear E/HardwareBinder: Transaction failed.
• 🔴 More than 48 hours have passed since the fall or exposure to moisture, and the problem remains.
• 🔴 The device overheats even when idle.

The cost of repair depends on the model and type of malfunction:

• 💰 Replacing the antenna module: 1500–3000₽.
• 💰 Cleaning the board from oxidation: 2000–4000₽.
• 💰 Motherboard replacement: from 10,000₽ (for flagships).

AttentionIf your device is under warranty, do not open it yourself—this will void the warranty. Contact an authorized service center. Samsung, having previously saved all data (warranty repairs often involve a full reset).

FAQ: Frequently asked questions about Wi-Fi and Bluetooth on Samsung devices

Is it possible to restore Wi-Fi/Bluetooth functionality without repair if the phone has been dropped?

In some cases, yes. If the fall wasn't severe, try:

1. Gently tap the back cover of the device (sometimes this restores antenna contact).
2. Place the phone in a bag of silica gel for 24 hours (if moisture is suspected).
3. Perform a full reset.

If this doesn't help, the board or antenna is most likely damaged and needs repair.

Why did Wi-Fi and Bluetooth stop working after the update?

This is a typical problem when updating. One UI, especially if:

• You missed several updates and installed the new version "every other one".
• The update was interrupted (for example, due to a low battery).
• The device has root or custom recovery installed.

Solution:

1. Reset network settings.
2. Clear the cache via recovery (Volume Up + Power + Bixby).
3. If it doesn't help, flash the device through Odin with a full reset (BL + AP + CP + CSC).

How to check if a Wi-Fi antenna is physically working?

There are two ways:

1. Visual inspectionDisassemble the device (if you have experience) and check the integrity of the antenna tracks. They are usually located under a metal cover near the bottom edge of the board.
2. Test with Wi-Fi AnalyzerInstall the app and see if your phone can detect any networks. If not, the antenna or module is faulty.

Caution: Unexperienced disassembly of the device may cause additional damage. If you are unsure, please contact a service center.

Can a virus block Wi-Fi and Bluetooth?

Theoretically yes, but in practice this is extremely rare. Viruses usually don't block hardware modules, but rather:

• Intercept traffic (for example, via VPN).
• Sending spam via Bluetooth.
• Displays ads when connected to Wi-Fi.

If you suspect a virus:

1. Install Malwarebytes and scan the device.
2. Check the list of installed applications for suspicious ones.
3. Perform a factory reset.

What to do if Wi-Fi works but Bluetooth doesn't (or vice versa)?

If only one module fails, the problem is most likely software-related. Try:

• 🔹 For Bluetooth:
  1. Remove all paired devices.
  2. Clear app data com.android.bluetooth.
  3. Check if the mode is enabled No sound or Do not disturb - They sometimes block Bluetooth.

🔹 For Wi-Fi:

1. Forget all saved networks.
2. Try connecting to a 2.4 GHz network (if you were previously using 5 GHz).
3. Turn it off Adaptive Wi-Fi in the settings.

If all else fails, the problem may lie with the driver for a specific module. In this case, the only solution is a firmware update or repair.