Why the screen on Xiaomi Redmi 7A goes out when you call or call out – a full analysis of the problem

The problem with the screen going out during a call on the Xiaomi Redmi 7A is one of the most common complaints of the owners of this budget smartphone: It seems that the phone is working (the call is coming, the interlocutor is heard), but the display suddenly turns off and does not respond to presses. In some cases, the screen does not even light up after the conversation is completed, forcing the device to restart. What is really happening?

In practice, there are many reasons for this behavior, from trivial power saving settings to serious hardware malfunctions. It is important to understand that the Redmi 7A Released in 2019, and in 4+ years of operation, many instances will have time to face wear and tear of components. However, take your time to blame the iron: in 60% of cases, the software or the wrong settings are to blame. Next, we will analyze all possible scenarios, from simple to complex, and give clear instructions how to return the phone to normal operation.

If your Redmi 7A is behaving like this, answer the question first.

📊 When did you first have a screen problem while calling?

Immediately after purchase

After the MIUI update

After the fall/hit

After battery/screen replacement

I remember.

1. Software reasons: settings and MIUI bugs

Let's start with the most innocuous, firmware failures or user-facing incorrect settings. Xiaomi Redmi 7A runs on MIUI (usually version 10-12), which is known for its power optimization "chips," and sometimes these optimizations work too aggressively.

The first thing to check is the power saving mode, and some versions of MIUI have a separate setting to turn off the screen when you call if the phone thinks it's pressed against your ear, to turn it off:

Go to Settings → Battery and Performance.
Select Battery Mode → Mode settings.
Find the option to turn off the screen during the call and deactivate it.

If there is no such item, try another way: Settings → Additional → Special features → Gesture Management and check the settings of the proximity sensor.

Another common cause is firmware bugs, for example, after upgrading to MIUI 12, many users complained about spontaneously turning off the screen.

🔄 Resetting to factory settings (don’t forget to make a backup!).
📱 Retraction to the previous version MIUI (If the problem has occurred after the update).
🛠️ Handheld firmware via Fastboot (for experienced users).

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Before resetting, write down your phone's IMEI (type *#06# in the dialer) to help restore the network if the connection goes missing after the reset.

2.The proximity sensor: why he "thinks" the phone is in the ear

The main hardware cause of a screen that's gone out is a faulty proximity sensor, which is located at the top of the screen (near the speaker) and is responsible for turning off the display when you bring the phone to your ear, and if the sensor is contaminated, damaged, or miscalibrated, it can fire falsely.

How to check the operation of the sensor:

Open the Phone app and type ##6484## (hardware component test).
Select Proximity Sensor (approximation sensor).
Close the sensor with your hand - the screen should go out, remove your hand - light up.

If the sensor does not respond or is triggered with a delay, the problem may be:

🧹 Sensor pollution (dust, fat, protective film).
🔧 Damage to the plume (for example, after falling).
🔋 Lack of power (the sensor does not receive enough voltage).

To clean the sensor, use a soft brush or compressed air. If that doesn't work, try recalibrating the sensor:

1. Install the Sensor Test app from Google Play.


2. Run the proximity sensor test.




3. Follow the calibration instructions (usually you need to bring and remove your hand several times).

What if the sensor is not calibrated?

If the sensor is still not working properly after calibration, it's probably a hardware problem, and if you're going to change the sensor or the entire display unit, the cost of repairs at the service center is 800 to 1,500 rubles.

3. Battery and power problems

On the Redmi 7A, it is common for the screen to go out when the battery is called because of a power drawdown, because the phone consumes more power during a conversation (communication module, processor, speaker), and if the battery is worn out, it cannot provide stable power.

Signs that the battery is to blame:

🔋 The phone is discharged quickly (less than 4-5 hours of operation).
⚡ When connecting charging during the call, the screen is turned on.
🔄 After the battery replacement, the problem disappears.

How to check the status of the battery:

Install the AccuBattery app from Google Play.
Check out the battery health indicator (normal – 80% and above).
If the value is below 70%, it is time to change the battery.

Battery status	Health (%)	Recommendations
Excellent.	90–100%	The battery isn't the problem.
Good.	80–89%	Could be under load.
Average.	70–79%	Replacement recommended
Bad.	Less than 70%	Urgent replacement!

If the battery is normal but the screen is still going out, check the power plume, and over time the contacts oxidize or depart, causing voltage drawdowns, in which case cleaning the contacts with alcohol or replacing the plume will help.

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If the phone goes off ONLY when connected to a charge during a call, the problem is almost certainly in the battery or power supply.

4. Conflict with SIM-map

Less often, but there are cases when the screen goes out due to problems with the screen. SIM-For example, if the phone is trying to switch between networks. 2G/3G/4G during the call, this can cause a short-term failure in the processor, which leads to a shutdown of the display.

How to diagnose the problem:

📶 Check the signal level at the time of the call. If it is unstable (it appears, then disappears), the problem may be in the network operator.
🔄 Try calling someone else. SIM-cards (or insert your own) SIM other-phone).
📱 In network settings (Settings) → SIM-Maps and mobile networks) disable automatic network selection and select Only mode 3G or 4G.

If the problem disappears when using another SIM-cards, the reason may be:

🛡️ Damaged. SIM-map (scraps, cracks).
📡 Incompatibility with the operator (rarely, but sometimes).
🔌 Bad contact in the slot (try to remove and insert the card again).

Also worth checking is the VoLTE (voice over 4G) settings, which can cause problems with the Redmi 7A to shut down VoLTE:

Settings → SIM- Maps and Mobile Networks → [Select SIM] → Voice → Turn off "VoLTE calls"

Mechanical damage: plumes, display, board

If all software methods have been tried and the screen is still going out, it's most likely a hardware fault.The Redmi 7A isn't the most durable phone, and even minor bumps or falls can lead to microcracks on the board or contact flares.

The most vulnerable areas:

📱 Display plume – if damaged, the screen may turn off when vibrating (e.g. during a bell).
🔌 Battery contacts – oxidation or poor pressing leads to power drawdowns.
🛠️ Power Grips – Overheating or corrosion can cause failures.

How to check:

Carefully tap the top and bottom of the phone while you're ringing. If the screen is reacting (on/off), the problem is the plume.
Light a flashlight at an angle on the screen – if you see severances or stripes, the display module is damaged.
Check if the phone is warmer than usual (especially in the processor area).

If you suspect a mechanical malfunction, you should contact a service center. Self-repair without experience can aggravate the problem.

🔧 Replacement of the display plume - 500-1000 rubles.
📱 Replacement of the display module – 1500-2500 rubles.
🔋 Replacement of the battery - 800-1200 rubles.

Try another battery (if you have one)|Testing the phone without a cover|Checking with another person SIM-card|Reset the settings to factory|Make sure the problem is not with the protective film (take it off)-->

6. Software lags and application conflicts

Sometimes the screen goes out due to conflicts between applications or system overload, for example, if a resource-intensive application (navigator, game, video messenger) is running during the call, the phone may not cope with the load and "hang" with the screen that is gone.

How to identify the culprit:

Launch your phone in Safe Mode (press the power button → long tap on "Switch off" → "Safe Mode").
Try making a call. If the problem is gone, one of the apps installed is to blame.
Turning to remove recently installed programs, starting with those that work in the background (antiviruses, optimizers, launchers).

It's also worth checking the logs for errors.

1. Install the Logcat Extreme app from Google Play.


2. Make a test call.




3. Look for errors with SensorService, Telephony, or PowerManager tags.

Typical applications that cause conflicts:

🔒 Antiviruses (Avast, 360 Security) – can block system processes.
🎮 High-demand games (PUBG, Genshin Impact).
📱 Third-party launchers (Nova Launcher, Apex Launcher).
🔄 Automatic Optimization (Clean Master, DU Speed Booster).

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If the problem occurs after an update to a particular app (such as WhatsApp or Viber), try rolling back to the previous version via the app. APK-file.

7. When should I contact the service?

If you’ve tried all the techniques in this article, but the Redmi 7A screen still goes out when you call, it’s time to contact the experts.

🔥 The phone is very warm even without loading.
⚡ The screen goes out even on the menu or with a simple scrolling.
🔌 After turning off the screen, the phone does not respond to the power button.
📱 Artifacts, stripes or flickering appeared on the display.

The service centre should:

Diagnose the phone on the diagnostic stand (checking power, plumes, chips).
Check the integrity of soldered contacts on the motherboard.
If necessary, replace the display module, plume or battery.

The cost of diagnosis in official Xiaomi services is usually 300-500 rubles. If you are offered repairs for a "symbolic" amount (for example, 200-300 rubles), this is a reason to be wary - most likely, just re-flash the phone, without eliminating the real reason.

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Xiaomi’s official service centers can be found on the website mi.com/ru/service/center. Avoid “garage” workshops without reviews!

FAQ: Frequent questions about the faded screen on the Redmi 7A

Can I repair the proximity sensor myself?

Theoretically, yes, but in practice, it's hard. The sensor is soldered into the display module, so you can't replace it separately, you have to change the whole screen. If you have soldering experience, you can try to solder the sensor plume, but it's risky.

Why does the screen go out only when incoming calls, and when outgoing calls work normally?

This may be because when an incoming call is made, the phone wakes up faster and loads the processor. If the battery or power plume is worn out, they don't have time to provide enough current and the screen shuts down. Also check the notification settings - sometimes conflicts with spam blocking apps (like Truecaller) lead to such failures.

After the screen was changed, the problem remained.

Probably, the wizard did not connect the proximity sensor plume or used a non-original display module without a sensor. Also check if the motherboard is damaged (for example, contacts under the plume), ask the wizard to double-check the connection or contact another service.

The phone vibrates when you call, but the screen doesn't turn on.

This is a sign that the phone is working, but the display is not getting power or signal. Try: Connect charging — sometimes the screen turns on. Press and hold the power button for 10-15 seconds (forced reboot). If it doesn't help, most likely, the display plume or the matrix itself is damaged.

Could a virus be the cause of a screen gone out?

Theoretically, yes, but in practice, it's unlikely. Viruses don't usually affect sensors or power. However, some Trojans can overload the processor, causing lags and shutting down the screen. Check the phone with antivirus (such as Malwarebytes) and remove suspicious apps.

⚠️ Attention! If the battery is replaced, the screen is going out more often, check the current charger. Non-original batteries may require more current than the power supply can provide, which leads to voltage drawdowns.

⚠️ Attention! Do not use alcohol with additives (e.g. cologne or medical alcohol with oils) to clean contacts. This may leave a film that will worsen the contact%.