Why the sensor on the Redmi 7A phone is not working: 10 reasons and 5 ways to fix it

If the sensor on your Xiaomi Redmi 7A has stopped responding to touch, don't rush your phone to the service center. 60 percent of the time, the problem is solved by yourself, without disassembling the device and expensive repairs. But first, it's important to understand what exactly went wrong: the touchscreen, the plume, the firmware or the mechanical impact.

This article will help you understand why the sensor on the Redmi 7A is not working, how to check its performance and what to do depending on the cause of the failure. We will look at both software failures and hardware malfunctions - with step-by-step instructions and warnings about typical errors.

1. How to determine if the sensor is not working: symptoms

Before you look for a solution, make sure the problem is with the sensor, not the display or system failure. Here are the key signs of a touchscreen malfunction on the Redmi 7A:

• 📱 The screen responds to late touches (appreciably late when pressed)
• 👆 The sensor is partially functional (does not respond to certain areas of the screen)
• 🔄 Touching is recorded spontaneously (the screen clicks on itself)
• ❌ Complete lack of reaction to touch (there is an image on the screen)
• 🔋 The phone restarts or turns off when you touch the screen.

If the Redmi 7A screen is completely black and does not respond to charging, the problem is most likely the display module or battery, not the sensor, in which case a comprehensive diagnosis is required.

⚠️ Attention: If the sensor stopped working after a phone drop or moisture hit, do not try to disassemble the device yourself - this can lead to damage to the plume or short circuit.

2. Programmatic reasons: when the firmware is to blame

In 30 percent of cases, the sensor on the Redmi 7A is not working due to software failures.

• 🤖 Firmware error MIUI (especially after updating)
• 📲 Application conflict (viruses, incompatible programs)
• 🔄 Resetting settings without correct completion
• 🛠️ Failed recovery through TWRP

How do you check if the problem is software? 7A computer-to-computer USB-If the phone is defined as a media device (you can view files), but the screen does not respond, it is likely the firmware is to blame.

How to resolve programmatic failures

1. Hard Reset (Hard Reset)

Press the Power + Volume button up for 10-15 seconds until the phone restarts. This will reset the OS's temporary errors.

2. Reset to factory settings

If the phone responds to volume buttons, try resetting your settings via Recovery Mode:

1. Turn off Redmi 7A.
2. Press Power + Volume up until the Mi logo appears.
3. Select Wipe Data → Wipe All Data (Change Volume Buttons).
4. Confirm the reset and wait until it is completed.

Save important data (photos, contacts)

Record your Mi Account (linked email/phone)

Charge your phone at least 50%

Disable Google Account (if any) FRP-lockdown)-->

3. Flashing through Fastboot

If the reset didn't work, you'll need to reinstall the firmware.

1. Download the official firmware for Redmi 7A (codename pine) from the Xiaomi Firmware website.
2. Install the Mi Flash Tool on your PC.
3. Connect the phone in Fastboot mode (clamp Power + Volume down).
4. Switch the device with a complete reset (Clean All).

⚠️ Warning: Continuous interruption of the firmware process can permanently disable the phone ("brick"). USB-cable and do not turn off power during the procedure.

3. Hardware malfunctions: what breaks down in the Redmi 7A

If the software methods didn't work, the problem is the hardware. 7A most often:

The most common hardware problem is the plume damage. In the Redmi 7A, it's thin and often rubbed with frequent lid openings. If the sensor is running in snags or only reacts to strong presses, the plume is to blame.

Can I fix it myself?

Replacing the plume or display module in the Redmi 7A is possible at home, but requires:

• 🔧 Special instrument (suction cup, mediator, tweezers)
• 🔥 Dryer or thermo-air station (to unplug the screen)
• 📐 Accuracy (damage to flexible contacts leads to complete loss of performance)

If you are not sure about your skills, it is better to contact the service. The average cost of replacing the touchscreen in the Redmi 7A is 2 000-3 500 rubles (depending on the region).

Moisture and corrosion: what to do if the phone is wet

Water is one of the most dangerous causes of sensor failure, and even if the Redmi 7A doesn't turn off immediately, the contacts can corrosion in a few days.

• 💧 The sensor only works in certain areas (e.g., at the edges)
• 🔋 The phone discharges quickly after contact with water.
• 📱 Divorces or spots under film appear on the screen

The wrong actions after getting moisture exacerbate the problem.

• ❌ Dry your phone with a hair dryer (hot air will damage the chips)
• ❌ Press buttons or touch the screen (will speed up corrosion)
• ❌ Charge the device in the first 24 hours

💡

If Redmi 7A Wet, immediately turn it off, remove it. SIM-card and battery (if possible), then put in a silica gel bag (out of a shoe box) for 48 hours!

How to Recover a Sensor After Water

If less than 48 hours have passed since the moisture has been ingested:

1. Take your phone apart (or take it to a service for professional cleaning).
2. Wipe the board and plumes with 96% alcohol (not vodka!).
3. Check the oxidized contacts – they will be greenish.
4. If necessary, clean the contacts with a stripe or a special liquid Contact Cleaner.

If corrosion has damaged the chips, the sensor controller or the entire display module will need to be replaced.

Partial operation of the sensor: "dead zones"

If the Redmi 7A has stopped working on individual parts of the screen, the reasons may be as follows:

• 🔧 Damage to the plume in a particular area (most often at the edges)
• 📱 Cracking on the inner layer of the touchscreen (not visible from the outside)
• 🤖 Sensor calibration failure (after update) MIUI)

For diagnosis, use the touch screen test:

1. Install the Touch Screen Test app from Google Play.
2. Run the test and run your finger across the screen.
3. Areas that do not respond will be highlighted in red.

If the dead zone is located at the edge of the screen, the problem is in the plume, and if the non-working area in the center, the touchscreen itself is likely damaged.

💡

Redmi 7A often fails the left part of the sensor due to the design of the plume. If the first 1-2 cm of the screen on the left is not working, prepare to replace the plume or display.

6 What to do if nothing helps

If you’ve tried all the techniques, but the sensor on the Redmi 7A still doesn’t work, there are two options left:

1. Contact the Xiaomi Service Center 📍Official services provide a warranty for repairs (1-6 months). 💰 The cost of diagnosis - from 500 rubles (below is the cost of repairs). ⏳ Repair period – 1-3 days (if there are spare parts available).
2. Buy a new phone if the cost of repair exceeds 50% of the price of Redmi 7A in the secondary market (about 5 000-7 000 rubles in 2026), it is more appropriate to consider a replacement. 9A (6,000 ₽) Poco C50 (7,500 ₽) Redmi 12C (9,000 ₽)

⚠️ Note: When selling Redmi 7A With a broken sensor, indicate the real state of the device. Hiding defects can lead to a refund through the platform (for example, Avito or Yula) or even a lawsuit under the Consumer Protection Act".

7.Prevention: How to prolong the life of the sensor

To avoid touchscreen issues on the Redmi 7A, follow the simple rules:

• 🛡️ Use tempered glass (protects against microcracks).
• 🧴 Apply a hydrophobic coating (such as NanoCoating) to protect against moisture.
• 🔋 Do not allow the battery to be completely discharged (may cause a malfunction of the controller).
• 📦 Avoid extreme temperature changes (for example, do not leave your phone in the cold).
• 🔄 Update your firmware regularly MIUI (Corrects bugs with sensor calibration).

If you drop your phone frequently, consider buying a case with shock absorbing inserts (like the Spigen Tough Armor) that will reduce the risk of damage to the plume on impact.

FAQ: Frequent questions about the Redmi sensor 7A