Why the screen on Xiaomi Redmi smartphones dims: a full analysis of the causes and solutions

Introduction: When a Dim Screen Is Not a Sentence

Have you noticed that your Xiaomi Redmi screen is less bright than usual? the picture looks faded, the colors have lost saturation, and in bright lights it becomes almost impossible to see anything on the display, a problem that affects owners of both budget models (Redmi 9A, Redmi Note 10) and flagships (Redmi K50, POCO F4).

The causes of screen dullness fall into two big groups: software failures (system settings, software errors) and hardware malfunctions (matrix wear, plume damage, battery problems). In 60 percent of cases, the problem can be fixed on its own without resorting to a service center. But it is important to correctly diagnose the source of the problem - otherwise you risk aggravating the situation.

In this article, we’ll break down all the possible causes of screen dullness on Xiaomi Redmi, from the banal (adaptive brightness enabled) to the critical (burnout). OLED-You'll learn how to check each one, and you'll get step-by-step instructions to fix it, and if it's a hardware problem, we'll tell you whether it's worth repairing the phone or whether it's cheaper to buy a new one.

1. Adaptive brightness: why the screen itself dims

The most common reason for dim screens is the adaptive brightness feature that automatically adjusts the display lighting to the lighting of the environment, which in theory should save battery power and reduce eye strain, but in practice often fails:

• 🌞 The light sensor is contaminated or covered with a protective glass / case - the phone "thinks" that it is dark around and mutes the screen.
• 🔄 Adaptation algorithm lost after update MIUI — The brightness is fixed or jumped at a minimum level.
• 📱 Some models (Redmi Note 8 Pro, Redmi) 9T) Adaptive brightness conflicts with reading mode.

How to check:

1. Open the settings → Display → Brightness.
2. Turn off Adaptive Brightness (or Auto Brightness in older versions of MIUI).
3. Manually set the brightness to 70-80% and check if the screen remains dim.

⚠️ Attention: If the adaptive brightness turned off, the screen became normal, but after a few days it dimmed again, the problem is the light sensor. ~500–1000 ₽).

2. Energy saving regimes and limitations of MIUI

MIUI aggressively optimizes power consumption, especially on Redmi's budget models. In pursuit of long-term performance, the phone can artificially limit the brightness of the screen even if the battery is 100% charged.

• 🔋 Battery Mode: Go to Settings → Battery → Battery mode and select Performance instead of Charge Saving.
• ⚡ Ultra-economic mode: In the same battery settings, turn off the option Ultra-economic mode - it forcibly reduces the brightness to 30%.
• 📵 Application restrictions: Some programs (such as YouTube or TikTok) may become dim due to background restrictions. → Annexes → Permits → Auto-start.

Especially often with a dim screen faced by owners of Redmi Note 11 and Redmi 10 after upgrading to MIUI 14. in this version, the system automatically activates energy saving at a temperature of the processor above 40 ° C, which leads to a dimming of the backlight.

Turn off adaptive brightness|Select the "Performance" mode in the battery settings|Disconnect the ultra-economic regime|Check permissions for frequently used applications-->

3.Firmware problems and MIUI failures

If the screen gets dimmed after a system update or custom firmware installation, the software is to blame.

• 🔄 Brightness jumps arbitrarily, even if the adaptive mode is turned off.
• 🖥️ In the display settings, it is impossible to change the level of backlight (the slider does not respond).
• 📱 The screen only dims in certain apps (like Google Chrome or Instagram).

Decisions:

1. Reset the display settings: Go to Settings → System → Reset settings → Reset the display settings.
2. Clear the system cache: In Settings → Memory → Cleanup, select the system cache and confirm the action.
3. Reverse to previous version of MIUI: If the problem has occurred after the update, use the official firmware archive.

For advanced users: If the crash is caused by a conflict with Magisk or Xposed, try removing modules related to brightness control (such as Brightness Control or Screen Filter).

Hardware malfunctions: when iron is to blame

If the software methods didn't work, the problem is physical damage to the components.

A critical sign of hardware failure: the screen dims when connected to a charger or when the phone is heated, indicating problems with the voltage stabilizer or battery, in which case repairs will cost between 2000 and 5000. ₽, But you can’t ignore the problem – it can cause the battery to burn.

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Before visiting the service center, take a picture of the screen at maximum brightness in a dark room, which will help the master to diagnose the problem faster (especially if dimness occurs periodically).

5. Effect of the battery on the brightness of the screen

Few people know, but a worn-out battery can cause a dim screen, which is because the power controller limits the power consumption of the display to extend the phone's life.

• 🔋 The screen dims at a charge level below 20-30%, even if the adaptive brightness is turned off.
• ⚡ The phone discharges quickly at high brightness (for example, when watching a video).
• 📉 B Settings → Battery → Battery condition shows wear over 30%.

How to check the battery:

1. Install the AccuBattery app (available on Google Play).
2. Look at the Healthy Battery, which is below 80 percent, and it's time to change the battery.
3. Check the voltage at 100% charge. The norm for Redmi is 4.35-4.4 V. If below 4.2 V, the battery has degraded.

⚠️ Note: If the screen remains dim after the battery is replaced, the problem may be in the charge controller (chip). BQ25890 It's going to cost 1500 to 3000. ₽, But it requires soldering at the component level.

External factors: covers, films and operating conditions

Sometimes the dimness of the screen isn't due to the phone, it's caused by the outside.

• 📱 Protective glass or film: Cheap matte-surfaced films (like matte screen protector) scatter light, making the picture fade. Try removing the protection and comparing the brightness.
• 🧤 Magnet case: Some cases (especially book-type cases) have magnets that affect the Hall sensor.This can knock off the adaptive brightness.
• ☀️ Direct sunlight: Even the maximum brightness of Redmi (450-600 nits) loses to the sun.
• 💦 Humidity or condensation: If the phone was in high humidity (bathroom, sauna), condensate could accumulate under the film, creating the effect of "turbid glass".

A simple test: turn on your phone and light it at an angle. If you see rainbow swelling or drops, it's a problem with protection or fluid intake. In the latter case, immediately turn off your phone and dry it in rice or silica gel for 24 to 48 hours.

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If the dimness of the screen is only manifested at a certain angle, the defect in the polarization layer is to blame. It's irreparable, just to replace the display module.

7.When repairs are impractical: economic analysis

If the diagnostics show that the problem is hardware, before repairing it, evaluate its feasibility. Here are the approximate prices for replacement of components for popular Xiaomi Redmi models (2023-2026):

Rule for decision:

• 💰 If repair costs more than 50% of the price of a used phone - it is more economical to sell a defective Redmi and buy a new model.
• ⚠️ For phones older than 3 years, repairing the display is often unjustified – there is a high risk that another component (for example, a battery or speaker) will soon fail).
• 🔧 Exception: if you have a Redmi with a AMOLED-screen (for example, Note 11 Pro)+), Replacing the matrix may be justified – such displays last longer LCD.

Before selling a faulty phone with a dim screen, honestly state the problem in the ad. In the secondary market, such devices are bought to:

• 🔧 Spare parts (battery, camera, motherboard).
• 📱 Flashing for other tasks (for example, to be used as a media player).
• 🎮 Repairs for themselves (many craftsmen buy faulty phones for workouts).

FAQ: Frequent questions about Xiaomi Redmi's dim screen