Xiaomi Redmi Note 9 Pro overheats: how to cool quickly and prevent heating

Xiaomi Redmi Note 9 Pro

heat-up

Redmi Note 9 Pro

50–55°C

In this article, we will analyze the causes of overheating of this model, and also give 7 Proven cooling methods, from simple (removing the cover) to radical (replacing the thermopaste). 9 Pro with firmware MIUI 12–14 and relevant for modifications Global/EU/India. If your phone is heating up even in standby mode, it is a signal of a serious malfunction, and we will tell you how to diagnose it.

⚠️ Attention: Temperature above 60°C can damage the battery of the Redmi Note 9 Pro BN50). With this heating, immediately disconnect the device from charging and stop using!

1. Why Xiaomi Redmi Note is overheating 9 Pro: top-5 cause

The Redmi Note 9 Pro is rarely accidental — usually a combination of several factors. 720G (8nm, which warms more than the flagship chips of the same year:

• 🔥 Games and heavy applications: PUBG Mobile, Genshin Impact or Call of Duty at maximum graphics settings load the processor by 90-100%, which leads to heating up to 48-52°C.

🔍 How do you check the temperature? Install the app. AIDA64 or CPU Monitor and monitor the indicators in the section Temperature. Normal for Redmi Note 9 Pro:

• 🌡️ 25–35°C. Standby mode;
• 🌡️ 35–45°C - light load (social networks, video);
• 🌡️ 45–55°C - games/charge (critical area);
• 🌡️ >55°C – Refrigerate the device immediately!

2. Software cooling methods: settings MIUI

Before you disassemble the phone, try optimizing the software. MIUI It has hidden temperature control functions that can be manually activated.

Step 1. Turn off background processes

Go to Settings. → Annexes → Autostart and disable autoboot for unnecessary programs:

• 🎮 Game launchers (Xiaomi Game Turbo);
• 📊 Social networks (Facebook, TikTok);
• 📍 Maps (Google Maps, Yandex.Navigator).

Step 2: Activate the Performance Mode

V MIUI 12+ There is a hidden mode "Battery and performance":

1. Open the settings → About the phone;
2. Tap 5 times on "Version" MIUI";
3. Enter password 123456789 (if it didn’t work, try ############)
4. Choose Balanced (balanced) or Power Saving (saving).

💡 Effect: Temperature decrease by 3-7°C by limiting the clock frequency of the processor.

Step 3. Update the firmware

Old versions. MIUI (up to 12.5.3) was a bug with overheating due to improper operation of the cores Cortex-A76. Check for updates in Settings → System update: Update version as of 2026 — MIUI 14.0.4 (Android 12).

3. Physical methods: how to cool the phone without disassembling

If Redmi Note 9 Pro is already hot, and you need to play or shoot videos urgently, use emergency measures:

Method 1. Removal of the cover

Silicone or plastic covers reduce heat output by 15-20%, remove it and place it on a metal or ceramic surface (such as a marble tabletop), avoid wooden coatings, which retain heat.

Method 2: Fan or air conditioner

Direct the airflow to the back cover (where the processor is located). Optimal air temperature is 18-22°Do not use cold air (below 15)°C) - this may cause condensation within the housing!

Method 3: Cooling stand

Fan stands (for example, Baseus Cooler Pad) reduce the temperature by 5-10°C. The Redmi Note 9 Pro will be a USB-Type-C model (to cool and charge at the same time). ₽.

Method 4: Cold Package (Emergency Method)

Wrap your phone in a thin towel and put an ice pack on it for 2-3 minutes. Don't put the ice directly! A sudden temperature swing can damage your screen or battery.

💡

If your phone overheats in the sun, don't turn it on immediately after cooling down. Wait 10-15 minutes to avoid condensation inside the case.

Hardware solutions: disassembly and replacement of thermal paste

If the Redmi Note 9 Pro is warming even after resetting, the problem may be a dried thermal paste or a deformed heat pad.

• ⚒️ Setting screwdrivers (T3, T5);
• 🧴 Thermopasta (Arctic) MX-4 Or the Thermal Grizzly Kryonaut);
• 📏 Plastic blade for opening the body;
• 🔥 Fryer (for softening glue).

Step-by-step:

1. Turn off the phone and remove it. SIM-map.
2. Heat the back cover with a hair dryer (temperature 60–70)°C) within 1-2 minutes.
3. Carefully tuck the lid with a plastic spatula, starting at the corner next to the volume button.
4. Unscrew 12 screws (do not lose them! they are of different lengths).
5. Remove the metal plate covering the processor.
6. Remove the old thermopaste with alcohol (90%+).
7. Apply the new paste with a thin layer (thickness 0.1–0.2 mm).
8. Put the phone back together.

⚠️ Note: When disassembling the Redmi Note 9 Pro, it is easy to damage the fingerprint scanner plume. If you are not sure about your skills, contact the service (cost of work is 1,200-1,800) ₽).

Alternative to thermopaste - heat pads

In some cases (such as when the original gasket is detached), it is better to install a new one. 9 Pro will fit the gasket thickness 0.5 mm thermally conductive 6 W/mK (For example, Fujipoly XR-m).

5. How to prevent overheating: prevention

To prevent the Redmi Note 9 Pro from warming up in the future, follow these rules:

Advice for gamers: In games of the type PUBG or Free Fire, set the chart to "Balanced" and FPS It's going to lower the temperature by 10 to 15.°C without severe loss of quality.

⚠️ Note: Do not use the Redmi Note 9 Pro in temperatures below 0°C – This can cause irreversible battery damage (Li-Po 5020 mAh).

6.When cooling doesn't help: diagnosing malfunctions

If none of the methods worked, the problem may be:

• 🔋 Faulty battery: Bloating or loss of capacity (check in AccuBattery) will cost between 1,500 and 2,500 replacements ₽.
• 🛩️ Damaged modem: If the phone only warms up when calling or mobile internet, the Snapdragon chip is to blame X51. Repairs - 3,000-4,500 ₽.
• 🖥️ Processor detachment: Requires soldering in the service (cost - 5000-8000) ₽). Symptoms: Accidental reboots, artifacts on screen.
• 🦠 Viruses: Check Malwarebytes or Dr.Web phone. uninstall suspicious apps.

How do I check the battery?

1. Install AccuBattery from Google Play.
2. Charge your phone to 100% and check the battery health score.
3. If the value is below 80%, the battery needs to be replaced.

Virus test:

Open the Settings. → Annexes → All applications and check:

• Unknown programs with the rights of "Administrator";
• Applications consuming >10% charge in the background;
• Programs with names like System Update or Clearer (often disguised as system ones).

💡

If the phone warms up even after changing the thermal paste and resetting, the problem is 90% hardware. Don't delay the diagnosis - repairing early is cheaper!

7. Alternatives: Unusual but effective solutions

If standard methods don’t help, try:

Method 1. Undervolting (reducing voltage)

With the Kernel Auditor app (required root), you can reduce the voltage on the cores of the processor. 720G optimality:

• Large nuclei (Cortex-A76): -50 m;
• Small kernels (Cortex-A55): -25 m.

💡 Effect: Temperature decrease by 5-8°C without loss of productivity.

Method 2: Smartphone cooler

External coolers (e.g. Black Shark FunCooler Pro) are connected via USB-C They cool the back with air, and they're suitable for long play sessions, and they cost 2,000 to 3,500. ₽.

Method 3: Liquid cooling (experimental method)

Some enthusiasts are installing a PC water-cooled system on the Redmi Note 9 Pro (with a miniature radiator).

• ✅ Plus, the temperature drops to 30-35°C under load;
• ❌ Cons: high risk of leakage and short circuit.

🔧 Recommendation: For most users, the optimal balance of cost and efficiency is the replacement of thermopaste. + cooler.

FAQ: Frequent questions about the Redmi Note overheating 9 Pro