Why Xiaomi Redmi Note 7 is hot: a full analysis of the causes and solutions

Xiaomi Redmi Note 7

45–50°C

switch off at temperatures above 60°C due to protection against thermal damage

battery-blown

Many users blame heat on "model features," but in practice, 90 percent of the time, the problem is solvable. In this article, we'll look at hardware and software causes, and diagnose them with hidden tools. MIUI, And we'll give you checklists to fix the malfunctions, from the banal cleaning of the cache to the replacement of the thermal paste.

Important: the normal operating temperature of the Redmi Note 7 under load is 35-42°C. If the smartphone is heated above 45°C standby or 55°C in games, that's cause for concern.

1. Normal temperature vs overheating: when to sound the alarm

The Qualcomm Snapdragon 660 in the Redmi Note 7 is built on a 14nm process, making it prone to heat up under prolonged loads.

• 🌡️ 30–35°C – the ideal temperature when standing by or surfing the Internet.
• 🔥 38–45°C - permissible in games (PUBG Mobile, Genshin Impact or video recordings 4K.
• ⚠️ 46–55°C - critical zone: the smartphone begins trottling (forced decrease in the processor frequency), possible lags.
• 💥 56°C+ — emergency shutdown: Risk of battery or chipset damage.

How do you check your temperature? Use apps:

• 📊 AIDA64 (Sensors section – shows the temperature of the processor, battery and charging controller.
• 🔧 CPU Monitor – monitors heating in real time with graphs.
• 🛠️ Hidden menu MIUI: Type in the dialer ##4636##, select Battery Information.

⚠️ Warning: If the battery temperature exceeds 45°C when charging, immediately disconnect the smartphone from the network.This may indicate a malfunction of the power controller or battery damage.

Overheating test: run 3DMark (Wild Life test and monitor the temperature through AIDA64. If the heating is more than 50 minutes later°C, diagnostics required.

2. Program causes of overheating: what can be fixed without disassembly

In 60 percent of cases, the Redmi Note 7 overheats because of software failures, not hardware failures, and let's look at the most common causes and ways to fix them.

Viral applications and background processes

Many users are installing APK Unverified sources that run hidden mining scripts or advertising bots, which load the processor by 80-100%, causing overheating.

How to check:

1. Open Settings → Applications → All applications.
2. Sort by Use. CPU (Turn on the display of system processes).
3. Look for suspicious apps with consumption > 20%.

Cooling system failure MIUI

In the firmware MIUI There's a bug in 12-14: sometimes the thermal-engine service freezes, which causes the smartphone to keep the processor frequency down when it's heated.

Decision:

1. Go to Settings → About the phone.


2.7 times tap the MIUI version (developer mode will be turned on).




3. Go back to Settings → Additional → For developers.




4. Find the option to turn off temperature control (if it is active, deactivate it).




5. Reset the device.

Cluttered cache and junk files

Over time, the system partition /cache It's clogged with temporary files, which makes the processor work harder. 30% case.

Turn off your smartphone.|Squeeze the power. + Loudness up|Choose the Wipe Cache Partition|Confirm the action.|Reset the device-->

Updates and firmware

If the overheating began to appear after the update MIUI, It's probably a problem with firmware optimization, and rolling back to a previous version or installing custom firmware (like Pixel Experience) can help.

⚠️ Attention: Before rolling back the firmware, make a backup through Settings → Additionally. → Backup: Continuous overheating after the upgrade may indicate a kernel-iron conflict, in which case only flashing through the Fastboot will help.

💡

If the smartphone warms only when connected to Wi-Fi, try changing the router channel to 5 GHz or turn off the Wi-Fi Direct function in the settings.

3. Hardware reasons: when without repairs can not do

If the software methods didn't work, the problem is the hardware. Consider the typical hardware faults of the Redmi Note 7 and their signs.

Wear of the thermal paste/thermolayer

Over time, the thermal interface between the processor and radiator dries up, which worsens the heat sink.The Redmi Note 7 is particularly prone to this problem because of its compact body.

Signs:

• 🔥 Fast heating to 50°C+ even with minimal loading.
• 📉 A sharp drop in performance after 5-10 minutes of play.
• 🛠️ When disassembling, it is visible that the thermopaste has become hard or absent.

Solution: Replace thermopaste with quality (for example, Arctic) MX-6 The cost of working in the service center is 800-1500 rubles.

Battery malfunction

Lithium polymer batteries degrade over time, and if the capacity falls below 70 percent of its nominal capacity, the battery starts to warm up when it's charged and discharged.

How to check:

• 📊 V AIDA64 Check out the Battery section. → Status.
• 🔋 If the capacity < 2500 mAh (at rated 4000 mAh) – battery to be replaced.

3. Damage to the motherboard

The soldered contacts of the processor or power module may move away due to temperature changes, which leads to increased resistance and heating.

Signs:

• 🔌 The smartphone is warming up even when turned off.
• 🔄 Self-recharge during heating.
• 🛠️ On the board, blackened or bloated capacitors are visible.

4.Contamination of the charging connector

Dust and oxidation of contacts in port USB-C They increase resistance, which leads to heating when charging, and cleaning with alcohol and replacing the cable solves the problem 40 percent of the time.

4.Overheating while charging: why it happens and how to fix it

One of the most common complaints of Redmi Note 7 owners is that the smartphone warms up when charging, especially if you use a fast charger.

1. Non-original cable or power supply unit

Cheap cables have thin wires that can't handle 2A current, which makes them warm, and power units without power surge protection can supply unstable power, loading the charging controller.

Decision:

• 🔌 Use the original Xiaomi cable (marking) MDY-08-EG).
• ⚡ The power supply should support Quick Charge 3.0 (18W).

2. Charging while playing or watching videos

If you play Call of Duty Mobile and charge your smartphone at the same time, the processor and power controller are running at their limit.°C.

Advice:

• 🎮 Turn off your smartphone from charging before starting heavy games.
• 📺 When watching a video in 4K use a power-driven charger 10W (slower but safer).

Failure of the power controller

Module PM660 (Power controller) in Redmi Note 7 sometimes fails, resulting in uncontrolled charging and overheating.

Diagnosis:

• 🔋 If the smartphone is warming even with the original RAM, check the charging current through Ampere (app).Norm: 1.5-2.0A.
• 🛠️ If the current is surges (e.g. 0.1A) → 2.5A), the controller needs to be replaced.

⚠️ Note: If the smartphone body heats up unevenly (for example, only in the camera area), this may indicate a short circuit in the power module!

💡

Charging at temperatures below 10°C or higher than 40°C accelerates battery degradation. Optimal range: 15-35°C.

5. Overheating in games: how to reduce the load on the processor

Redmi Note 7 is not positioned as a gaming smartphone, but many users run it on it PUBG Mobile, Free Fire or Genshin Impact.At maximum graphics settings, the Snapdragon 660 processor heats up to 60°C, which leads to trottling (decrease) FPS).

How to reduce heat:

• 🎮 Set the graphics to Balanced or Low in the game settings.
• ⚙️ Enable Performance Mode in Settings → Battery → Modes (but this will increase heating!).
• 🧊 Use a cooling stand with a fan (e.g. Black Shark FunCooler Pro).
• 🔄 Close all background apps before playing (via Settings) → Annexes → Clean up).

Setting up the restriction FPS

Many games are defaulting to 60. FPS, But the Snapdragon 660 doesn't always handle that kind of load. FPS Up to 30–40 with the help of an engineering menu:

1. Install the Game Bench app from Google Play.


2. Launch the game and wait for data collection.




3.In Game Bench settings, limit FPS to 30 for stable performance.

Disconnection of unnecessary services MIUI

Branded shell MIUI It runs a lot of background processes that load the processor:

1. Go to Settings → Applications → Autostart Management.
2. Turn off autoplay for Mi Video, Mi Browser, Cleaner.
3. B Settings → Battery → Select applications set for games mode Without restrictions.

💡

If the game is laying and warming the smartphone, try installing it. GFX Tool for graphics optimization. PUBG Mobile select Smooth Configuration + Extreme FPS.

6.Diagnostics through engineering menu and hidden codes

Xiaomi hides from users a lot of diagnostic tools that help to identify the cause of overheating. Here's how to use them.

Temperature sensor test

Enter the dialer:

##4636##

Select Battery Information. Here's the temperature:

• Battery is a battery.
• CPU — processor.
• Skin, body.

Checking the status of the battery

The code for diagnosing the battery:

##6484##

In the Battery Info section, please note:

• Voltage - normal: 3.7–4.2V.
• Temperature - not to exceed 45°C.
• Health – If good, the battery is fine.

3. Processor and memory test

Code for checking iron:

##2846579##

Choose:

1. ProjectMenu → Background Settings → Hardware Testing.
2. Run the tests. CPU and RAM.

If the tests are completed with an error (Fail), a diagnosis is required at the service center.

4. Checking of the charging controller

Code for the charging test:

##64663##

In the Charging Test section, check:

• Input Voltage – must coincide with the voltage of the power supply.
• Input Current - Normal: 1.5–2.0A.

⚠️ Note: If a Connection Problem message appears when you enter the code, it may indicate that the module has been damaged. RF (In this case, overheating is often accompanied by problems with the network.

7.When to contact the service: signs of critical malfunctions

Some overheating problems can't be solved by yourself, and here are the red flags that you need to carry your smartphone for repair:

• 🔥 The smartphone shuts down at temperatures below 50°C indicates a temperature sensor malfunction or failure in the PMIC (power-train).
• 💥 Battery bloating – if the case is deformed, further use is dangerous!
• 🔌 The swelling is a swelling (the swelling is a swelling). 0.1A before 2A) — sign of controller damage.
• 📡 Overheating is accompanied by loss of the network - may indicate the collapse of the antenna module.
• 🛠️ Blackening or smell of burning from under the back cover is a clear sign of a short circuit.

Cost of repair in the service center:

How to choose a service center:

• 🔍 Check reviews on Yandex.Maps or 2GIS.
• 🛡️ Prefer centers with a 6-month guarantee.
• 💰 Compare prices: if repair costs 2 times cheaper than the average market price, this is a reason to be wary.

What to do if the smartphone guarantees:

If the Redmi Note 7 has been warm since the purchase, please contact the Xiaomi Authorized Service Center.According to the Consumer Protection Act (Article 18), you have the right to:

• 🔄 Free repairs.
• 💱 Replacement with a similar model.
• 💰 Money back (if the malfunction is not repaired).

⚠️ Warning: Make a full reset before visiting the service (Settings) → Additionally. → Resetting the settings to rule out software reasons, otherwise you may be denied warranty repairs.

FAQ: Frequent questions about the Redmi Note overheating 7