Why Xiaomi Redmi 7 spontaneously turns off: a full analysis of the reasons

Why is this happening with the Redmi 7?

The Xiaomi Redmi 7, launched in 2019, has become one of the most popular budget smartphones thanks to a combination of performance and price. However, many users face the problem of spontaneously turning off the device - both during active use and in standby mode. This problem is not always related to battery wear: 30% of cases are to blame for software failures, and 15% - hardware defects of the board.

Redmi 7 features a Snapdragon 632 processor and a 4,000 mAh battery that, when used improperly, can cause sudden shutdowns, such as overheating of the chipset due to background processes or degradation of the power controller after 2-3 years of use. In this article, we will examine all possible causes, from banal discharge to hidden defects in the motherboard, as well as give step-by-step instructions for diagnosing and troubleshooting.

It's important to understand that if the phone turns off when charging, when it's cold or when it's under high load (playing games, shooting videos), it's a different problem, and we structured the material so that you can quickly find a solution for your case.

1. Battery wear or damage is the main cause

In 60 percent of cases, the Redmi 7's spontaneous shutdown is due to battery degradation. The average life of a lithium polymer battery is 2-3 years (or 500-800 charge cycles), then the capacity drops by 20 to 30 percent, and the power controller starts to misidentify the charge level.

• 🔋 The phone turns off when shown 20-30% charge, but after switching on shows 0%.
• 🔌 Charging is jerky: it quickly gains interest, then “hangs” on one value.
• 🌡️ The battery swelled (seen by the raised screen or warping of the back cover).

Check the status of the battery through the hidden menu of engineering codes:

1. Open the Phone app.
2. Enter the combination: ##4636##
3. Go to the Battery Information tab and see Battery Health, below 80%, critical.

If the battery is swelling, replace it immediately. Lithium polymer batteries in this state can ignite when mechanically exposed or overheated. The original battery for the Redmi 7 has an articular articula. MB-J20BR (The cost of replacement in the service center - from 1500 to 2500 rubles.

⚠️ Warning: Never use a phone with a bloated battery! Even if it turns on, the risk of short circuit and fire remains.Switch off the device and remove the battery (if possible) before replacing.

2. firmware failures and MIUI errors

Software errors are the second most common cause of sudden shutdowns.Redmi 7 originally worked MIUI 10, but after updating to MIUI 12/13 Many users have encountered bugs associated with:

• 🤖 Optimizing energy consumption: MIUI aggressively closes the background processes, which can lead to the collapse of the system.
• 🔄 Post-conflict conflicts OTA-Updates: Incomplete firmware installation or failure when downloading a package.
• 📱 Miui.guardprovider: Responsible for security, but sometimes blocks critical processes.

How do you diagnose? Check the error logs.

1. Install the Logcat Extreme app from Google Play.
2. Start log recording and wait for spontaneous shutdown.
3. After turning on the phone, find the lines in the logs with the keywords: shutdown, battery, thermal or crash.

If the problem is in the firmware, it will help:

• 🔄 Reset to factory settings (save data!). Way: Settings → The phone. → Resetting settings.
• 📥 Fastboot flashing (if the reset didn’t help). To do this, download the official firmware from the Xiaomi website and use the Mi Flash Tool tool.

⚠️ Note: Fastboot flashing erases all data, including photos and messages. If your phone turns off when you connect to your PC, use it. EDL-mode (emergency firmware), but this requires an authorized Xiaomi account.

3. Processor overheating and trottling

Redmi 7 is equipped with a Snapdragon 632 processor, which can overheat when you are under intense load (games, video rendering, multitasking) if the chipset temperature exceeds 85-90°C, hardware protection is triggered – the phone forcedly is turned off to prevent damage to the board.

Causes of overheating:

• 🎮 Long-term gaming sessions (especially in the PUBG Mobile, Genshin Impact).
• 🔥 Clogging of the charging connector or using non-original cable (increases the load on the power controller).
• ☀️ Operating in the sun or in hot climates (ambient temperature above 35)°C).
• 🖥️ Ventilation failures (for example, after a phone drop).

How do you check the temperature? Install the app. AIDA64 or CPU Monitor and monitor the heating schedule:

Decisions:

• 🛑 Close all background applications (use Settings) → Annexes → Launched).
• 🔌 Turn off your phone from charging during games.
• 🧊 Use a cooling case or stand with a fan.
• 🔧 If overheating occurs even in simple - replace the thermopaste on the processor (disassembly is required).

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To reduce the heat when playing, activate the performance mode in Settings → Special facilities → Play mode and select the option “Balanced».

4.Problems with the power controller or motherboard

If the phone turns off when charging or when connecting headphones, the power controller is to blame (PMIC) It's a hardware malfunction that often occurs after a circuit break:

• ⚡ Phone falls (especially by the corner).
• 💦 Moisture intrusion (even if the phone didn’t sink, the condensate could oxidize the contacts).
• 🔌 Use of a poor-quality charger (voltage jumps damage) PMIC).

Symptoms of Controller Failure:

• The phone is turned on only after repeatedly pressing the power button.
• Charging is only in the off state.
• The message appears on the screen: "Charging paused. Battery temperature too low."

Diagnosis:

1. Try charging your phone with another cable and power supply (original from Xiaomi).
2. Connect the charger and slightly press on the connector USB-C If the phone starts charging, the problem is the connector.
3. Check if the contacts on the board are oxidized (you need to disassemble the phone).

Decisions:

• 🔧 Re-ploughing of the power controller (cost in the service - from 3000 rubles).
• 🔌 Replacement USB-The scalp (if the problem is there).
• 💧 Cleaning the board from oxidation (using an ultrasonic bath or alcohol).

⚠️ Warning: If the phone turns off when you connect to a charger and the connector warms or smells of a fire, turn it off immediately.

5. Application conflicts and viruses

It's rare, but it happens that the phone turns off because of a third-party app malfunction or a virus.

• 🎵 Music players (such as Spotify or Spotify) VK Music) with codec errors.
• 📸 Camera applications (such as GCam) that conflict with drivers.
• 🦠 Viruses-miners that load the processor 100% in the background.

How do we find the culprit?

1. Launch your phone in Safe Mode (hold the power button) → long tap on "Switch off» → «Safe regime»).
2. If the phone does not turn off in safe mode, the problem is in one of the installed applications.
3. Remove recently installed programs or scan your phone with an antivirus (Malwarebytes or Dr.Web).

Top.-5 Applications that cause crashes on Redmi 7:

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If the phone only turns off when a particular app is launched, uninstall it and check reviews on Google Play. Often, these bugs are fixed in new versions.

Mechanical damage: power button, plumes, screen

Physical defects are another possible cause, like:

• 🔘 Sticking of the power button (due to dust or wear of the micro-switch).
• 📱 Damage to the screen plume after falling (may cause short circuit).
• 🔧 Weakening of battery contacts (phone turns off when shaken).

How do you diagnose?

• Press the power button 10 to 15 times in a row, and if it fails or clicks indistinctly, you need to replace it.
• Shake the phone (carefully!) If it turns off, the problem is battery contacts.
• Light the flashlight on the screen at an angle, and if you see rainbow stripes, the plume is damaged.

Decisions:

• 🔧 Replacement of the power button (cost - 800-1500 rubles).
• 📱 The slacks (if they are not paid).
• 🔋 Cleaning the battery contacts (use alcohol and cotton swab).

⚠️ Warning: If the phone turns off after a fall and doesn't turn back on, don't try to disassemble it yourself!A damaged board can have microcracks that, if handled incorrectly, will cause a complete failure.

7.Problems with SIM-link-card

Rarely, but it happens that the phone turns off due to modem malfunctions or conflict with the phone. SIM-This is typical of the Redmi 7 if:

• 📶 You're using two. SIM-Cards (especially from different operators).
• 🔄 The phone is turned off when calling or during data transmission.
• 📵 A message appears on the screen "SIM-card not supported".

How do you check?

1. Extract. SIM-Check if the phone is turned off without it.
2. Try inserting the SIM into another slot (if two cards are used).
3. Update your network settings: go to Settings → SIM-maps and mobile networks → Network settings → Select the network and select the Automatic mode.

If the problem is in the communication module, it will help:

• 🔄 Resetting network settings (Settings) → System system → Resetting settings → Resetting network settings).
• 📱 Reflashing the modem (requires custom recovery, for example, TWRP).
• 🔧 Replacement of antenna module (in the service center).

FAQ: Frequent questions about Redmi 7