Xiaomi 12 is warming up: the norm or the reason for repairs?

Xiaomi 12 is the flagship of 2022 with the top-end Snapdragon 8 Gen 1, but many users experience overheating. In some cases, it is a normal reaction to load, in others it is a symptom of serious problems. In this article, we will examine all possible causes, from banal launch of games to hidden board defects, and give step-by-step instructions on diagnosis and troubleshooting.

It's important to understand that the Xiaomi 12 is initially prone to heat because of the processor architecture and compact body.°C in standby mode or your smartphone is switched off from overheating when charging, which is already an alarm bell. We have gathered data from service centers, forums and tests to help you determine when your smartphone is warming within normal limits and when intervention is required.

1. Normal temperature Xiaomi 12: when not to panic

The manufacturer claims that the operating temperature of Xiaomi 12 can reach 40-45°C under intense load. This is related to:

• 🔥 The Snapdragon 8 Gen 1 chipset is Qualcomm's first 4nm processor known for its "hot" temperament. In tests, it heats up more than the Snapdragon 888 in the Xiaomi 11.
• 📱 Compact housing – only 6.95 mm thick limits the space for cooling.
• 🎮 Game mode - when activated Game Turbo processor accelerates, which increases heat output.

According to tests from GSMArena, when you start Genshin Impact at maximum settings, the temperature of the rear panel of Xiaomi 12 rises to 47°C. CPU It's going to be 70 percent throttled, which is normal for this model, but if you heat it up to 50.°C+ in simple tasks (watching videos, messengers), this is a cause for concern.

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Use the app. AIDA64 or CPU Monitor for accurate measurement of core temperature of the processor, not just the case. Norm for Snapdragon 8 Gen 1 under load - up to 85°C (short peaks).

2. Program causes of overheating: what can be fixed independently

In 60% of cases, overheating Xiaomi 12 is due to software factors, to begin with the most common:

Background processes and optimization MIUI. Shell MIUI 13/14 It's known for aggressive memory management, but sometimes it works against the user. PUBG Mobile, and in the background, Google Maps is navigation, the processor gets a double load. → Annexes → Launched.

Some games (e.g. Call of Duty: Mobile) are not adapted for Snapdragon 8 Gen 1 and load all 8 cores to maximum.

• 📉 Lower your graphics settings to Medium or Low.
• ⚙️ Enable Performance Mode in Settings → Additionally. → Performance mode (choose Balanced, not Maximum).
• 🔄 Update the game and drivers GPU via Google Play.

Disable auto-update apps in the background|Close unused applications manually|Reduce the graphics settings in games|Update MIUI last-minute|Reset network settings (if you warm up when transferring data)-->

Viruses and mining scripts. In rare cases, hidden mining programs cause overheating.

1. Traffic consumption in Settings → SIM-maps and mobile networks → Traffic.
2. Processor activity in AIDA64 (if CPU It is uploaded to 90% for no apparent reason).
3. Presence of suspicious applications in Settings → Annexes.

3. Hardware reasons: when without repairs can not do

If the software methods didn't work, the problem lies in the hardware. Here are the key hardware reasons for Xiaomi 12 overheating:

Thermopaste is Xiaomi’s weak spot 12. In service centers note that the factory paste dries already through 12-18 If your smartphone is warming more than it did immediately after you bought it, it's probably time to replace it:

• 🌡️ Temperatures are rising to 48-50°C when watching YouTube.
• ⚡ Rapid discharge of the battery (for 3-4 mid-hour).
• 🎮 Strong trottling in games (FPS fall 30-40%).

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Replacing thermopaste with Xiaomi 12 reduces the temperature 8-12°C under load and increases the battery life on 15-20%.

Battery is second most common cause. Xiaomi battery 12 (capacity 4500 mAh) degrades after 300-400 If the smartphone warms up when connected to charging and charges more slowly than before, check the status of the battery:

1. Enter the number ##4636##.
2. Select Battery Information.
3. Check the parameter The level of wear (norm - up to 20%).

When charging.|During games|Standby mode|Using the camera|Another option-->

4.Overheating when charging: why it is dangerous and how to fix

Many users complain that Xiaomi 12 heats up 45-50°C when charging, especially with fast adapters (67W or 120W). It's connected to:

• ⚡ High charging power – Qualcomm Power Controller Q71 heats up when the current is converted.
• 🔋 Battery degradation – over time, the internal resistance of the battery increases, which increases heat generation.
• 📱 Using a smartphone during charging - simultaneous load on CPU And charging doubles the heat.

How to charge Xiaomi 12 correctly:

1. Use the original Xiaomi cable and adapter (power) 67W). Cheap analogues can cause overheating.
2. Do not play heavy games while charging. If you need to recharge urgently, transfer your smartphone to Air Mode.
3. Remove the cover - it worsens heat transfer.
4. Charge at ambient temperature 10-30°C. In cold or heat, the battery degrades faster.

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If your smartphone is warming up when charging wirelessly (Qi), try changing the charging station. Some models (such as the Xiaomi Mi Wireless Charging Pad) are better compatible with the Xiaomi 12 than the universal ones.

Dangerous symptoms when charging:

⚠️ Note: If Xiaomi 12 heats up to 55°C+ When you charge and you smell like a fire, immediately disconnect it from the mains, which may indicate a short circuit in the power controller or a bloated battery.

5. Impact. 5G and mobile network at temperature

Xiaomi 12 supports support 5G, but the Snapdragon module X65 With a weak signal, the smartphone can warm up even in standby mode, constantly trying to "catch" the network.

How to reduce the heat from the mobile network:

• 📶 Turn it off. 5G, If not needed: Settings → SIM-maps and mobile networks → Network type (select the network type) 4G).
• 🔄 Enable Traffic Saving Mode in Settings → Connections and sharing → Saving traffic.
• 📡 If the signal is weak (1-2 dividing, switch to 3G Or use Wi-Fi.

According to the test, the transition from 5G on 4G Reduces the temperature of Xiaomi 12 on 3-5°C when watching videos on the Internet. It is also worth turning off Network Search in roaming - this will reduce the background activity of the communication module.

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Use of the two SIM-The card simultaneously increases the heat on the 20-30% If you don't need both cards, turn off one in the settings.

6 Camera overheating: why Xiaomi 12 heats up when shooting video

Xiaomi camera module 12 (Sony's main sensor IMX766, 50 MT) warms up during long-term video shooting, especially in 4K@60fps or 8K. It's connected to:

• 🎥 Real-time video processing – Snapdragon processor 8 Gen 1 loaded 60-70%.
• 🔋 The Stabilization Works – Algorithms OIS + EIS require additional calculations.
• 🌡️ Heating sensor - matrix IMX766 It itself produces heat during long-term work.

How to reduce the heat during shooting:

1. Reduce video resolution to 1080p@30fps (This reduces the load on the processor. 40%).
2. Turn it off. HDR and AI-Improvements in camera settings.
3. Use an external battery to power it – this will reduce the load on the internal battery.
4. Take breaks every time. 10-15 minute-by-minute.

If the camera warms up even when taking pictures, it may indicate:

• 🔧 Problems with the camera plume (after falling or repairing).
• 🛠️ Defect of the heat pad between the camera and the body.

7. Diagnosis of overheating: step-by-step instructions

To determine the cause of overheating, follow this algorithm:

1. Check the temperature: Set AIDA64 or CPU Monitor, run a stress test. CPU (into AIDA64: Tools → System Stability Test: If the temperature is above 90°C, problem with cooling or thermal paste.
2. Check the battery: Type ##4636## and see the wear level. > 25%, replace the battery.
3. Test without case: Remove the case and repeat the test. if the temperature has dropped by 5°C+, heat-discharge.

Check the charger.

• Try charging with the original Xiaomi adapter 67W.
• If the heat has decreased, the problem is in the non-original RAM.

If after all the checks the reason is not found, but the smartphone continues to warm, contact the service center for the diagnosis of the board.

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

Some symptoms indicate serious hardware problems that cannot be solved on their own:

⚠️ Note: If the Xiaomi 12 is warming up in the off state (especially in the area of the camera or the lower part of the body), this is a sign of a short circuit on the board!

Signs requiring professional repair:

• 🔥 Heating to 60.°C+ standby.
• 🔋 Battery bloating (body deformed, screen "raised").
• 📱 Artifacts on the screen (strips, flickering) when heated.
• ⚡ Self-resetting at temperatures above 45°C.
• 🛠️ Extraneous sounds (squeaking, crackling) from the speaker or body.

The cost of repairs in 2026 (Moscow / St. Petersburg):

• Replacement of thermopaste - 1,500-2,500 ₽.
• Battery replacement: 3,500–5,000 ₽ (original).
• Diagnosis of fees - 1000-1 500 ₽.
• Chip soldering - from 5,000 ₽.

When choosing a service, pay attention to:

• 🔧 Original parts (ask for certificates).
• ⏱️ Work guarantee (minimum 6 months).
• 📝 Reviews of a specific masters (on 2GIS or Yandex.Maps).

FAQ: Frequent questions about Xiaomi overheating 12