Why Xiaomi Redmi Note 8: 12 Common Problems and Solutions

The Xiaomi Redmi Note 8, released in 2019, is still one of the most popular budget smartphones in the secondary market. However, as you age, even reliable technology begins to “catch up”: sudden reboots, overheating, problems with the camera or network. In this article, we systematically analyze why Xiaomi Redmi Note 8 has some malfunctions, from software failures to hardware breakdowns, and give step-by-step instructions for fixing them.

The model features a balance between performance (Snapdragon) 665, 4/6 GB of RAM) and price, but that trade-off sometimes makes itself felt, like quickly discharging the battery through a battery. 2-3 Year of operation or "lag" of the interface after updates MIUI. We analyzed data from service centers and user reviews to highlight the 12 The most common causes of malfunctions, which are characteristic of this model. NFC or IR-Ports can be associated with specific Redmi Note modifications 8/8T/8 Pro – check the version of your device!

1.Why Xiaomi Redmi Note 8 is fast discharge

If your smartphone keeps a charge for less than a day with moderate use, it may be:

• 🔋 Battery degradation: after 500 Charging cycles, the capacity falls on 20-30%. Check the status of the battery through the settings → Battery → Battery status.
• 📱 Background processes: MIUI aggressively optimizes the work of applications, but some (for example, Facebook or Telegram) can “wake up” and spend charge.
• 🔌 Unoriginal RAM: the use of chargers with a current strength above 2A accelerates battery wear.
• 🌡️ Overheating: if the body is heated above 40°C, the battery controller forcibly limits its capacity.

For diagnostics, install the AccuBattery app (free on Google Play) that will show the real battery capacity and discharge rate. If the capacity is below 70% of the factory capacity (3500 mAh for the Redmi Note 8 Pro, 4000 mAh for the standard version), the battery should be changed. The cost of the original battery is from 1500 rubles, replacing in the service will cost 500-800 rubles.

⚠️ Warning: Don't use "fast" charging from other brands (such as Samsung or OnePlus). Redmi Note 8 supports Quick Charge 3.0, but incompatible protocols can damage the power controller.

2.Overheating: when it is normal and when it is broken

The Snapdragon 665 in the Redmi Note 8 is warmer than the flagship chips, but there are limits to the norm:

If the temperature exceeds the critical level:

1. Check Settings → Special features → Application permissions → Autorun and disable unnecessary programs.
2. Remove the cache in Settings → Storage → Cache data.
3. Remove the cover - it can block the heat sink.
4. If overheating is accompanied by spontaneous reboots, this may indicate a malfunction of the motherboard (diagnosis is required in the service).

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To reduce heat during games, activate Performance mode in Settings → Battery → Performance modes and set an FPS limit of 30 frames/sec.

3.Camera problems: blur, artifacts, errors

The Redmi Note 8 main camera (48 MP, Sony IMX586) is known for its "artifacts" in poor light.

• 📸 Blurred images: check if the lens is dirty (wipe with a soft cloth); if the problem persists, the stabilizer may have been damaged.
• 🔍 Green/purple spots: matrix defect or camera firmware problems. Try resetting the camera settings to Settings → Annexes → Camera. → Warehouse → Clear the data.
• 🚫 Failed to connect to camera error: often occurs after updates. The solution is to restart the phone or roll back the firmware.

To diagnose hardware problems:

1. Run the camera test through the engineering menu: dial ##4636## → Equipment Test → Camera.
2. If the test shows an error, try flashing the camera module separately (instruction below).

4.The network is not working: 4G, calls, mobile internet

Communication problems on the Redmi Note 8 fall into three categories:

1. Software: Failure in settings APN Or modem. Solution: reset your network settings to Settings. → SIM-maps and mobile networks → Resetting settings.
2. Hardware: damage to the antenna module (often after falls). Symptoms: the coverage grid "floats", calls are interrupted.
3. Operator: For example, Tele2 or Iota may not support VoLTE on this device.

If the phone doesn’t catch the network at all:

Check if it's inserted. SIM-card correctly (chip up)

Restart your phone in Safe Mode (hold the power button → Safe Mode)

Update your firmware to the latest version of MIUI

Try another one. SIM-Card (possibly a problem with the operator)-->

⚠️ Note: If you have disappeared after the update 4G, check the settings APN. For MTS, Beeline and MegaFon, they should be as follows: MTS (or your operator) APN: Internet.mts.ru Proxy: not installed Port: not installed Username: mts Password: mts

5.Spontaneous reboots and "departures" in recovery

If the Redmi Note 8 suddenly reboots or hangs on the MI logo, the reasons may be as follows:

• 🔄 Firmware conflict: especially after "over the air" updates, the solution is to flash your phone through Fastboot (instruction below).
• 🔋 Battery Failure: If Reboots Occur in the Event 20-30% charge, the battery does not hold voltage.
• 🔥 Overheating of the processor: check the temperature through AIDA64. If >50°C in simple - a replacement of the thermal paste is required.

For firmware via Fastboot:

1. Download the official firmware from the Xiaomi website (select the Redmi Note 8 model, Russia region).
2. Unpack the archive and launch it. flash_all.bat (For Windows, use the command: fastboot flash boot boot.img fastboot flash system system.img fastboot flash recovery recovery.img
3. After the firmware, reset via Wipe Data to Recovery.

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If the phone only loads in Fastboot mode but doesn't turn on normally, that's a sign of damage to the boot partition, and flashing it helps 80 percent of the time.

6.The sensor or part of the screen is not working

Problems with the Redmi Note 8 sensor are usually related to:

• 💥 Physical damage: cracks on the screen or detachment of the plume (especially after falls).
• 📱 Calibration failure: after changing the screen or updating the firmware, solution - calibration through the engineering menu (##6484##).
• 🔌 Connector pollution: dust or moisture under the screen. Requires disassembly and cleaning.

For a temporary solution (if the sensor is partially recalled):

1. Connect the mouse through OTG-adapter.
2. Enable Settings → Special features → Universal access → Pointer control.
3. Make a backup of data and contact the service - self-repair of the screen without experience is fraught with damage to the matrix.

7. Problems with the speaker or microphone

Typical symptoms:

• 🔊 Quiet sound in the speaker: check settings → Sound. → Sound quality. If it doesn't work, maybe the speaker grid is full.
• 🎤 The interviewee can't hear you: clean the microphone (located at the bottom of the case) with a toothpick!
• 🔇 Sound distortions: often associated with damage to the audio codec (Qualcomm chip) WCD9340). Diagnosis required.

For the microphone test:

1. Record a voice message on WhatsApp or Telegram.
2. Call another phone and see if you can hear it.
3. If the microphone doesn’t work at all, check if it’s turned off in Settings → Apps → Phone → Permissions → Microphone.

8. It's not working. NFC or IR-port

Redmi Note 8 (except for India) NFC and IR-The port may stop working after:

• 📲 Firmware updates: especially if you have installed custom firmware (e.g. LineageOS).
• 🔧 Settings reset: Sometimes, permissions for system applications are reset.
• 💥 Physical damage: NFC-antenna is located under the back cover and can come off when disassembling.

To turn on NFC:

1. Go to Settings → Connection and Exchange → NFC.
2. If there is no item, check the firmware region (should be EEA or Global).
3. For the test, download the NFC Tools app and try counting any label (such as a bank card).

For IR-port):

• Install the Mi Remote app.
• If the remote is not working, update the device database in the application settings.

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If the NFC stopped working after the battery was replaced, check if the antenna plume is damaged. It goes from the motherboard to the top of the housing.

FAQ: Frequent questions about Xiaomi Redmi Note 8