Why is charging, and the Xiaomi phone is not charging: a full analysis of the problem

You plugged in a Xiaomi Redmi Note 12, a POCO X5 or another smartphone from the brand to a charger — charging animations have appeared on the screen, but battery percentages don’t rise or even fall. In some cases, the phone may shut down completely after 5-10 minutes, despite the cable being connected, a problem typical of Xiaomi Android devices and has both software and hardware roots.

V 80% In some cases, the power controller, oxidized contacts or firmware failure is to blame, but sometimes the reason lies in the banal - for example, in the use of a non-original cable with a damaged swipe. In this article, we will discuss all the possible reasons why charging allegedly “goes”, but the battery does not charge, and also give checklists for diagnostics and repairs (33W/67W/120W), where the problem is more common due to high currents.

1. Checking the charger and cable: why they might be to blame

The first thing to rule out is a charging kit malfunction, and even if the display on the screen shows the charging process, it doesn't guarantee that the current actually enters the battery, especially for cheap AliExpress cables or fake Xiaomi accessories.

How to check:

• 🔌 Connect your phone to another charger (preferably the original one from Xiaomi with Quick Charge 3.0 support)+).
• 📱 Try charging another phone with the same cable - if it's not charging, too, the cable is the problem.
• 🔍 Check the connector. USB-C on phone and cable: oxidation, contamination or strain of contacts can block current transmission.
• 📊 Use the AccuBattery app (available on Google Play) to check the actual charging current.If it's below 200mA, the cable or power supply is faulty.

Pay attention to the power supply: if you use charging on 5W support-model 67W (For example, Xiaomi 13 Pro, the phone may think it's charging, but in fact the battery is running out faster than it's charging. 4X or Mi A1.

⚠️ Warning: If you connect the cable, the phone says, "Charging is suspended. Temperature is too high," but the body feels cold, that's a sign of a damaged power controller.

Oxidation and contamination of the USB-C connector: how to clean without damage

The USB-C connector in Xiaomi smartphones is often contaminated with dust, crows, or oxidized by moisture, leading to unstable contact: the phone recognizes the cable connection (hence showing charging animations), but the current is either not coming in or not enough to charge.

How to clean the connector:

1. Turn off the phone and remove it. SIM-card/memory card (if any).
2. Take a toothpick (not a metal one!) or a plastic spatula and carefully remove visible contaminants from the connector.
3. Soak the cotton swab in isopropyl alcohol (90%+) and wipe the contacts. Don't use water or wet wipes!
4. Let the connector dry for 10-15 minutes, then try charging the phone.

If the oxidation is strong (the contacts are green or blackened), it may be necessary to replace the connector. In Xiaomi service centers, this service costs from 800 to 1500 rubles depending on the model. For POCO F5 or Redmi K60 with fast charging 67W, it is recommended to use only original connectors, since cheap counterparts may not withstand high currents.

Power Controller Failure: How to Diagnose and What to Do

A power controller (or PMIC) is a chip that regulates battery charging, power distribution, and overheating protection, and if it fails, the phone can:

• 📉 Show charging, but battery percentage doesn't rise or even drop.
• 🔥 Overheat when connected to a charge (even if the battery is cold).
• ⚡ Turn off when connecting the cable or after 5-10 minutes of “charging».
• 🔄 Cyclically turn on/off when connecting to the network.

Causes of Controller Failure:

• ⚡ Use of non-original chargers with unstable voltage.
• 💦 Moisture entering the case (even if the phone hasn't sunk, high humidity can cause corrosion).
• 🔌 Sharp voltage surges in the network (for example, in a thunderstorm).
• 📱 Falling the phone on a hard surface (especially if the impact occurred on the lower part of the body).

How to check:

1. Connect your phone to your computer via USB, and if it's detected but not charged, it's more of a controller problem.
2. Try wireless charging (if supported). If the phone is charging wirelessly but not through cable, it's the controller or connector that's to blame.
3. Use a tester or multimeter to check the voltage on the battery contacts (you need to disassemble the phone–4.4V.

⚠️ Attention: If the power controller burned, self-repair is almost impossible - you need to solder the chip on the board. In Xiaomi service, this service will cost 2000-5000 rubles depending on the model. For flagships (Xiaomi 14, Mix Fold 3) it is cheaper to replace the motherboard.

4. Software glitches: firmware, cache and "broken" updates

Sometimes the problem is not hardware, but software.

• 🤖 Android Failure After Updating (Especially Relevant for Android) MIUI 14 on older models like the Redmi Note 9).
• 🗑️ Damaged cache of a system or applications responsible for power management.
• 📱 Viruses or malicious applications that block charging (such as some battery “optimizers).

How to fix it:

Clear the cache in Recovery|Reset to factory settings |Return the MIUI update |Remove suspicious applications |Swipe the phone through Fastboot-->

Details on each item:

1. Cache cleanup in Recovery: Turn off the phone. Press Volume up + Power before the Mi logo appears. From the Recovery menu, select Wipe & Reset → Wipe Cache. Reboot the phone and check the charging.
2. Reset to factory settings: If cleaning the cache didn't help, make a full reset via Settings → About Phone → Reset. Attention: This will delete all data, including photos and apps!
3. Reverse MIUI Update: If the issue has occurred after the update, try rolling back to the previous version via Settings → System Update → Three Points → Select the Service Pack (you need a firmware file from the 4PDA forum).

If the phone is charging when it's off, but it's not charging when the screen is on, it's almost always a software failure, and then it's only a flashing through a Fastboot or a flashing over a Fastboot. EDL-regime.

5. Battery wear or bloating: when replacement is needed

The average battery life of Xiaomi smartphones is 2-3 years (or 500-800 charge cycles), after which the capacity drops, and the phone can:

• 📉 Show charging, but the percentage does not increase (current goes to the “power” of the system, not the charge).
• 🔥 Overheat and disconnect when connected to the network.
• 🕒 Charge only when switched off.

How to check the wear of the battery:

1. Install the AccuBattery app and check the battery health setting, and if it's below 80 percent, you should change the battery.
2. Check if the battery is swelling: put the phone on a flat surface and spin it. If it sways or the body is arched, the battery is swelling.
3. Look at Settings → Battery → Battery status. If it says "Replace battery" it's a direct signal.

The cost of replacing the battery in the service Xiaomi:

⚠️ Attention: If the battery is swelling, you can't keep using the phone! The risk of fire or explosion when charging is extremely high.

6.Maternal board problems: short circuit and other breakdowns

If all the previous methods didn't work, the motherboard might be the problem.

• 🔥 Short circuit in food chains (often after falling or getting moisture).
• 🔌 Damage to power lines from connector USB-C battery-wise.
• 📱 Failure of the charging chip (separate from the power controller).
• 🔄 Failure to work BIOS (For phones on Qualcomm, this is it. QFPROM, on Mediatek - Preloader).

Signs of fee breakdown:

• The phone does not turn on from either the charging or the power button.
• When connected to the network, the screen flashes or shows a red indicator (short-circuit signal).
• The phone is defined by the computer as Qualcomm HS-USB QDLoader 9008 (emergency firmware mode).

Diagnosis and repair:

1. Connect the phone to your PC and check if it is detected in Device Manager.
2. If the phone is included in Fastboot (clip Volume Down + Power), try flashing it through the Mi Flash Tool.
3. If the board is physically damaged (blackened elements, the smell of burning), repair is possible only in the service with a soldering station.

The cost of repairing the board starts from 3,000 rubles and can go up to 10,000-15,000 for flagships. In some cases it is cheaper to buy a new phone, especially if the model is old (for example, Redmi Note 7 or Mi 9).

💡

If the phone doesn't turn on but vibrates when connected to charging, it's a sign that the board is getting power but can't boot the system. Try pinching Volume up + Power for 20 to 30 seconds to force the capacitors to discharge and reset power.

7.Fast Charging Features: Why 33W/67W/120W May Be a Problem

Xiaomi’s fast-charging phones (Redmi Note 12 Pro+ with 120W, POCO F5 with 67W) are more likely to face charging problems due to:

• 🔌 Overheating of the power controller at high currents.
• 📉 Unstable voltage in cheap power supplies.
• 🔋 Battery wear that cannot withstand high currents.

How to check:

1. Turn off fast charging in settings: Settings → Battery → Fast charging.
2. Try charging your phone with the original power supply from Xiaomi (e.g. MDY-12-ED for 120W).
3. If the phone charges on 5W but not on 67W, the problem is with the controller or battery.

For models with 120W (such as Xiaomi 11T Pro or Black Shark 5 Pro) it is recommended to:

• 🔌 Use only original cables and power supplies.
• 📱 Do not charge your phone during games or resource-intensive tasks.
• 🔋 Turn off fast charging after 80% to reduce battery wear.

💡

If Xiaomi’s fast-charging phone stopped charging, try turning off the fast-charging feature in the settings first. If it starts charging after that, the problem is with the power controller or faulty unit.

FAQ: Frequent questions about the problem