Replacing the Wi-Fi Module on an iPhone: A Complete Guide with Photos and Details

Replacement Wi-Fi module on iPhone — a problem smartphone owners face when their connection is constantly dropping, internet speeds are slow, or signal is completely lost. In 80% of cases, the problem lies not in software glitches, but in physical damage to the chip responsible for wireless communication. Apple doesn't provide official support for DIY repairs, but with the right tools and instructions, you can perform the procedure at home, saving up to 70% on the cost of a service center.

This article is suitable for models iPhone 11/12/13/14/15 (including Pro And Pro Max), as their Wi-Fi modules have similar designs. We'll explore how to diagnose the problem, select a compatible spare part, carefully remove the old module, and install a new one—without risking damage to the motherboard or antenna cables. We'll pay special attention to a common mistake when disconnecting a battery that results in a short circuit in 30% of DIY repairs.

How to tell if your iPhone's Wi-Fi module is faulty

Before disassembling your smartphone, make sure the problem is in the hardware. Symptoms of a faulty Wi-Fi module Often confused with software glitches or router problems. Here are the key signs:

• 📶 Constant connection breaks — The iPhone disconnects from the network every 5-10 minutes, although other devices work reliably.
• 🐢 Critically low speed — even near the router the speed does not exceed 1–2 Mbps (check through Speedtest).
• 🔍 Doesn't see the network — the settings display an empty list, although there are active access points nearby.
• 🔄 Cyclic reboot of the module — the Wi-Fi icon disappears and reappears without user intervention.
• 🔌 Bluetooth doesn't work — in 60% of cases, Wi-Fi and Bluetooth modules are integrated into one microcircuit (Broadcom BCM4375 or similar).

If at least 2-3 symptoms match, the probability of a hardware failure is 90%. But before disassembling:

1. Reset network settings: Settings → General → Transfer or reset iPhone → Reset network settings.
2. Update iOS to the latest version (sometimes bugs are fixed in new firmware).
3. Check the operation with another router - there may be a problem with your network settings (for example, an incompatible standard) 802.11ax).

⚠️ Attention: If your iPhone has been dropped in water or subjected to strong impacts, there's a high risk of corrosion on the motherboard. In this case, replacing the Wi-Fi module may not help; a microscopic examination will be required.

What Wi-Fi module do you need for your iPhone?

Wi-Fi modules for iPhone differ not only by model, but also by motherboard revision. For example, for iPhone 12 There are 3 variants of modules - for versions A2172, A2403 And A2404Installing an incompatible part will result in no signal or an error. "Unable to activate cellular network".

To select the correct module:

1. Find out the exact iPhone model: Settings → General → About → Model (For example, iPhone 13 Pro Max A2644).
2. Check the motherboard revision - to do this you will need to remove the back cover and find the marking next to the battery connector (for example, 820-00XXX).
3. Look for a module with the same markings as the original part. Popular manufacturers: Broadcom, Murata, USI.

Where to buy:

• 🛒 AliExpress — inexpensive modules (from 800 rubles), but high risk of counterfeiting. Look for sellers with a 98%+ rating and reviews with photos.
• 🔧 Local service centers — original or high-quality OEM parts (price is 30–50% higher).
• 🌍 eBay — used modules from dismantlers (40% cheaper, but check the description for corrosion).

⚠️ Attention: Modules for iPhone 14/15 They often come with pre-soldered antenna cables. If your original cable is damaged, you'll have to buy a kit (module + cables), which costs 1,000–1,500 rubles more.

Tools for replacing the Wi-Fi module

For disassembly iPhone Replacing the module will require specialized tools. Using improvised tools (knives, the wrong size screwdrivers) will almost certainly damage the cables or the housing.

Minimum set:

• 🔧 Pentalobe P2 — to unscrew the screws on the Lightning connector.
• ✕ Phillips #000 - for motherboard screws.
• 📱 Plastic spatulas (2–3 pcs.) — for disconnecting cables.
• 🔥 Hair dryer or heating station — to peel off the battery (temperature 60–80°C).
• 🧲 Magnetic mat — for fixing screws (there are about 30 of them in the iPhone!).
• 🔍 Magnifying glass or microscope - to check the soldering (optional, but recommended).

Additionally, you may need:

• 🧴 Isopropyl alcohol (90%+) — to clean contacts.
• 🔧 Tweezers — for careful disconnection of cables.
• 🔋 External battery (Power Bank) — to avoid draining the iPhone's battery during repairs.

The cost of the complete set is from 1,500 ₽ AliExpress up to 5,000 ₽ in offline stores. If you plan to repair your iPhone regularly, invest in high-quality tools (for example, a set iFixit Pro Tech Toolkit).

Step-by-step instructions for replacing the Wi-Fi module

The replacement process takes 1-2 hours, depending on experience. The main rule: take your time and follow the instructions step by step. Errors in steps 3–5 (working with the battery and cables) most often lead to further damage.

Algorithm of actions:

1. Turn off your iPhone and remove the SIM card. Connect an external battery (if available) to prevent accidental activation during repair.
2. Remove the Pentalobe screws near the Lightning connector and carefully pry up the screen with a plastic spudger. Start at the bottom edge—there are fewer cables there.
3. Disconnect the battery:
   • Heat the back cover with a hair dryer (60–80°C) for 2–3 minutes.
   • Pry up the battery adhesive tape and slowly pull the tab (do not tear!).
   • Disconnect the battery cable from the motherboard (use a plastic spudger).
4. Remove the metal screen from the motherboard (6-8 screws Phillips #000). Be careful - there are antenna cables running underneath it.
5. Disconnect the cables:
   • Wi-Fi module (usually located near the top left corner of the board).
   • Cameras and proximity sensors (so they don't interfere).
6. Remove the old module:
   • Loosen the screw securing the module.
   • Carefully pry it up with a spatula (do not bend the contacts!).
7. Install a new module:
   • Check the compatibility of the markings.
   • Secure with a screw (do not overtighten!).
   • Connect the cables in reverse order.

Assemble the iPhone:

• Connect the battery and check if it turns on (if it doesn’t, see the “Common Errors” section).
• Apply new adhesive tape to the battery.
• Tighten all screws and install the screen.

After reassembly, don't turn on your iPhone immediately—let the battery adhesive set (10–15 minutes). Then, check Wi-Fi and Bluetooth functionality.

What to do if your iPhone won't turn on after assembly?

If after connecting the battery the iPhone does not respond to the power button, check:

1. Correct connection of the battery cable (it should fit tightly, without any distortions).

2. Presence of a short circuit - carefully smell the board (if there is a short circuit, you will smell a burning smell).

3. Battery charge - connect to charger for 10 minutes, then try to turn it on.

If the problem persists, the contacts on the motherboard are likely damaged. In this case, a diagnostic check at a service center will be required.

Common mistakes and how to avoid them

Even when replacing a Wi-Fi module carefully, novices can make mistakes that lead to further breakdowns. Here are the most common:

• 🔋 Short circuit when battery is disconnected — occurs if you do not remove the SIM card or touch several contacts at the same time with a screwdriver. Solution: Always use plastic spudgers to disconnect cables.
• 📡 Damage to antenna cables - thin wires can be easily torn if dismantled carelessly. Solution: Secure the cables with tape before unsoldering the module.
• 🔧 Tightening the screws - leads to cracks on the board. Solution: use a torque screwdriver (tightening torque - 0.3 Nm).
• 🔥 Battery overheating — If you heat it with a hair dryer for more than 3 minutes, the glue melts and the battery swells. Solution: Heat in short intervals (heat for 30 seconds, cool for 30 seconds).
• 🔄 Incompatible module — even if the part looks similar, it may not work. Solution: Check the markings under a magnifying glass.

If Wi-Fi doesn't work after replacement:

1. Check if the antenna cable is connected (it is thin and easily falls out of the connector).
2. Update your iOS device - sometimes a reflash is required to recognize the new module.
3. Reset network settings (Settings → General → Transfer or reset iPhone → Reset network settings).

⚠️ Attention: If after replacing the module the iPhone stopped seeing the SIM card, most likely you damaged it modem cable (located next to the Wi-Fi module). In this case, both components will need to be replaced.

How to test the operation of a new Wi-Fi module

A successful replacement involves not only physically installing the part, but also ensuring all functions are functioning correctly. Perform the checks in the following order:

1. Visual inspection:
   • Make sure all screws are tightened.
   • Check if the screen is warped (this is a sign of improper assembly).
2. Wi-Fi Test:
   • Connect to 2.4 GHz and 5 GHz networks separately.
   • Check your speed through Speedtest (must match the tariff).
   • Move 10–15 meters away from the router – the signal should remain stable.
3. Bluetooth test:
   • Connect headphones or a speaker.
   • Check the file transfer (for example, send a photo to another smartphone).

Diagnostics via code:

• Dial *#06# - if IMEI is displayed, the modem is working correctly.
• Go to Settings → Wi-Fi → (i) next to the network and check the parameters IP address And MAC address (should be displayed without errors).

If everything works, but the Wi-Fi speed is lower than expected:

• Check your router settings - it might be in the enabled mode. 802.11b/g (limits speed to 54 Mbps).
• Make sure that the power saving mode is not enabled on your iPhone (it limits the module's performance).
• Update your router's firmware—older versions may conflict with the new Wi-Fi module.

Problem	Possible cause	Solution
Wi-Fi connects, but the internet doesn't work.	Incorrect IP/DNS settings	Reset your network settings or set your DNS manually (e.g. 8.8.8.8)
Bluetooth works, but Wi-Fi doesn't.	The antenna cable is damaged	Check the cable connection to the module
iPhone overheats when using Wi-Fi	Poor quality module or poor thermal conductivity	Replace the thermal paste (if your model has it)

Should I replace the Wi-Fi module myself or contact a service center?

The decision depends on your experience, iPhone model, and budget. Here's a comparison chart:

Criterion	Self-replacement	Service center
Price	1,500–3,500 ₽ (spare part + tool)	4,000–8,000 ₽ (depending on the model)
Time	1–3 hours (including diagnostics)	1–3 days (including the queue)
Guarantee	No (if you damage the board, repairs will cost more)	3–12 months (depending on the service)
Risks	Damage to cables, battery, motherboard	Minimum (when choosing a proven service)
Complexity	Medium (requires accuracy and tools)	No (everything will be done for you)

Self-repair is justified if:

• You already have experience disassembling electronics (for example, replacing a screen or battery).
• iPhone is older than 3 years (the risk of damage is lower than with a new one).
• You are prepared for the fact that you may need to disassemble it again (for example, if you forgot to connect a cable).

Contact the service if:

• iPhone is under warranty (doing repairs yourself will void it).
• You've never held a soldering iron or a screwdriver in your hands. Pentalobe.
• The problem occurred after a fall or exposure to moisture (board diagnostics will be required).

⚠️ Attention: In official service centers Apple They may refuse to repair your iPhone after you replace components yourself. If you value the warranty, it's best to contact them immediately.

FAQ: Frequently asked questions about replacing the Wi-Fi module on an iPhone

Is it possible to replace the Wi-Fi module on an iPhone without soldering?

Yes, on most models (starting from iPhone 11) The module is secured with a screw and connected via a connector. Soldering is only required in rare cases—for example, if the contact pads on the board are damaged. However, for iPhone 14 Pro/15 Pro Some modules come with antenna cables soldered on, which complicates the process.

Why doesn't my iPhone see 5 GHz networks after replacing the module?

This may be due to:

• Incompatible module (some cheap analogs only support 2.4 GHz).
• Router settings (check if the mode is enabled) 802.11a/n/ac/ax).
• Damaged antenna cable (5 GHz is more sensitive to connection quality).

Solution: Test the module on another iPhone or test it with another router.

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

Prices vary by model and region:

• iPhone 11/12: 3 500–5 000 ₽.
• iPhone 13/14: 5 000–7 000 ₽.
• iPhone 15 Pro Max: 7 000–10 000 ₽.

The price usually includes diagnostics, module replacement, and post-repair testing. At authorized service centers Apple the price may be 20-30% higher.

What should I do if Touch ID stops working after replacing the module?

This isn't related to the Wi-Fi module. Most likely, you:

• The cable was damaged Touch ID (comes from the Home button to the motherboard).
• The screen was connected incorrectly (on models with a Home button, the Touch ID cable is integrated into the display module).

Solution: Disassemble your iPhone and check the cable connections. If the cable is broken, it will need to be replaced (cost: ~1,500 ₽).

Is it possible to use a Wi-Fi module from another iPhone?

Theoretically yes, but only if:

• The modules are identical in marking (for example, both Murata 339S00650).
• The revisions of the motherboards match (for example, both 820-00400).
• Antenna cables fit the connector (in some models they are different).

In practice, it is easier to buy a new module - used parts often have hidden defects (corrosion, microcracks).