Replacement NFC-Xiaomi chips: when you need them and how to do it right

Chip. NFC In smartphones, Xiaomi is responsible for contactless payments, data transfer and work with smart devices. If the module fails, the phone stops reading bank cards, does not see the tag or gives an error "NFC-80 percent of the time, the problem is software-solved, but sometimes you need a physical replacement of the component.

This article will help determine if a replacement is needed. NFC-antenna or chip, find a compatible module for your Xiaomi model (including Redmi Note 12, POCO X5, Mi 11 and others), and to perform the repair yourself with minimal risks, we will understand what tools you need, where to buy parts and how to avoid typical soldering mistakes.

Important: the procedure requires precision and basic electronics skills, and if you've never taken a smartphone apart, you'd better go to a service center, but if you're willing to take a chance, follow our instructions Step-by-step.

Signs of malfunction NFC-module on Xiaomi

Before you start replacing, make sure that the hardware is the problem. NFC-chip-off:

• 🔴 Function NFC in the settings Settings → Connections → NFC not activated (the switch returns to the "off" position.")
• 💳 Phone does not recognize bank cards (Google Pay, Mi Pay, SberPay issue error "The device does not support contactless payments")
• 📱 Reading applications NFC-tags (e.g, NFC Tools show a message "NFC not found"
• 🔄 The function works intermittently: it reads tags, then not (may indicate damage to the antenna)
• 🔧 After falling or getting moisture NFC It has stopped working (even if the rest of the functions are normal)

If at least one of these signs appears, try software recovery methods first:

1. Reset network settings: Settings → System → Settings Reset → Reset settings Wi-Fi, mobile network and Bluetooth.
2. Update your firmware to the latest version via Settings → About Phone → System Update.
3. Check the work. NFC Safe Mode (without third-party applications).

If nothing's worked, it's probably hardware.

What Xiaomi models have a removable NFC-chip

Not in all Xiaomi smartphones NFC It's designed as a separate chip, and in some models, it's integrated into a core processor (SoC) or wireless communication module, making it impossible to replace it without completely soldering the motherboard:

Before buying a spare part, check the exact modification of your device through the app. CPU-Z (hardware → For example, the Redmi Note 10 Pro has versions with the NXP PN547 and ST21NFCA — They're not interchangeable!

If your model is not represented in the table, check the motherboard schemes on sites like eTrade Supply or iFixit. NFC, PN54x or ANT (antenna).

Preparation for replacement: tools and spare parts

For replacement NFC-Chip or antenna on Xiaomi you will need:

Special screwdriver (Pentalobe) P2 orthorx T3)

Plastic mediators for disassembling the body

Solding station (power) 30-60 W) or soldering hairdryer

Solder and flux (acid-free)

Tweezers and antistatic bracelet

New NFC-module + antenna, if required)

Isopropyl alcohol (90%+) and cotton swabs

-->

Where to buy spare parts:

• 🛒 AliExpress: Cheap options, but long waits.Look for sellers rated 98%+ Compatibility with your model.
• 🛠️ eTrade Supply or RepairUniverse: Original and OEM-spare parts, but more expensive.
• 🏬 Local service centers: sometimes sell used modules after repairing other devices.

Cost of new NFC-The chip for Xiaomi varies from 300 before 1500 depending on the model, the antenna will cost 100-500 If you've never soldered chips, practice on an old board or buy a spare module.

⚠️ Attention, don't use cheap Chinese soldering irons without adjusting the temperature, overheating can damage the motherboard, optimal soldering temperature NFC-chip — 300-350°C.

Step-by-step instructions for replacement NFC-chip

The replacement process is broken down into steps. Follow them strictly so that you don't damage the other components.

1. Disassembly of the smartphone

Turn off the phone and remove it. SIM-Then there's the maps:

1. Heat the back cover with a hair dryer (temperature) ~60°C) or use a suction cup to separate it from the body, insert a plastic mediator into the slot and carefully guide it along the perimeter.
2. Unscrew all the screws that hold the metal plate (shielding). In the Redmi Note 12 Pro, there are 12 of them - don't lose!
3. Unplug the battery plume, then remove the battery (stick on double-sided tape) and put it in a mediator, but don't rot!

2. Dismantling the old NFC-module

Find the chip on the motherboard. It's usually next to:

• 📍 Antenna contacts (metal tracks under the back cover)
• 📍 Wireless communication module (Wi-Fi/Bluetooth)
• 📍 Connector for SIM-map

For dismantling:

1. Put flux on the chip contacts.
2. Heat the module with a hairdryer (temperature 300)°C) or soldering iron, at the same time tweezing it.
3. After removal, clean the contact area with alcohol and remove the remains of solder with an overflower.

3. Installation of a new chip

Before rations:

• 🔍 Check the integrity of contact sites on the board (whether there are any detachments or oxidation).
• 🔍 Compare the new chip to the old one – the number and location of the legs should match.

The rationing process:

1. Apply a thin layer of flux to the site.
2. Install the chip with tweezers, combining the legs with contacts.
3. Heat the module with a hairdryer (300)°C) or solder each leg with a soldering iron.
4. Check the absence of a multimeter.

4. Checking the performance

After assembly:

1. Turn on the phone and check for the item. NFC customized.
2. Install the app NFC Tools and scan the test tag (e.g. transport card).
3. Set up contactless payments via Google Pay or Mi Pay.

⚠️ Attention, if after the replacement NFC It doesn't work, check: antenna integrity (may be damaged when disassembled); solder quality (whether there are cold contacts); chip compatibility (even similar models may differ!).

Replacement NFC-antennae (if there is a problem with it)

In 30 percent of cases, the fault is not in the chip, but in the antenna, a thin wire that runs around the perimeter of the body, which can break when disassembled or oxidized by moisture, and it's easier to replace the antenna than the chip, but requires care.

How to determine if the antenna is to blame:

• 📶 NFC switched on but not read labels at a distance of more than 1 cm.
• 🔄 The function only works in a certain position of the phone.
• 💧 The phone fell or came into contact with water.

Instructions for replacement:

1. Remove the back cover (as in step 1 of the previous instruction).
2. The antenna is usually glued to or below the lid, and carefully separate it by heating it with a hair dryer.
3. Install a new antenna by combining contacts with the connector on the motherboard (marked as NFC_ANT).
4. Stick the antenna to a bilateral tape or heat glue.

The cost of the new antenna is from 100 to 500 rubles. POCO X3 Redmi Note 10 is a universal antenna. 0.15mm FPC.

💡

If you can't buy the original antenna, you can use 0.1 mm thick copper foil, cut it from the old antenna pattern. It's a temporary solution, but it often works!

Frequent Mistakes and How to Avoid Them

Even experienced professionals make mistakes when replacing NFC-Here are the most common modules:

If the phone is not switched on after replacement:

1. Check if the contacts are closed on the board (use a magnifying glass).
2. Disconnect the battery for 10 minutes – sometimes helps to reset the charge of the capacitors.
3. If only the Xiaomi logo is on the screen, it may be a bootloader that is damaged.

💡

If you're not sure about your soldering skills, you'd better contact the service. NFC In the workshop – from 1000 to 3000 rubles, which is often cheaper than buying tools and the risk of damaging the phone.

Alternative solutions if the replacement does not help

In rare cases, even after replacement NFC-Module function is not restored. Possible causes and solutions:

• 🔧 Power controller damaged: if the phone does not supply voltage NFC-chip, you will need a diagnosis of the power supply circuit (you need experience in electronics repair).
• 📱 Software failure: run your phone through the Mi Flash Tool with a complete erasure of data (clean all).
• 🔄 Firmware conflict: some custom ROM (For example, LineageOS may not support NFC. Return to the official firmware.
• 🛡️ Lock-in IMEI: If the phone was under repair under warranty, the manufacturer could block the phone. NFC-Check through the engineering menu (#4636##).

If nothing helps, consider the options:

• 💳 Use the external NFC-adapter (connected to the USB-C Or Bluetooth, ACR1255U worth ~2000 rubles.
• 📱 Buy a used motherboard with a worker NFC (Avito or AliExpress).
• 🔄 Exchange your phone with Xiaomi Trade-In (if the model is supported).

FAQ: Answers to Frequent Questions