Why does my screen go black during calls?

Your phone screen may go black during calls due to a software issue or glitch. Sometimes, updates or certain apps can interfere with the normal operation of the phone’s proximity sensor. Here’s what you can do:
1. Restart Your Phone: This can often fix temporary software issues.
2. Check for Updates: Make sure your operating system and all apps are up to date. Sometimes, updates contain fixes for known issues.
3. Reset Settings: This can help if a particular setting is causing the problem. Go to your phone’s settings and look for an option to reset all settings.
4. Safe Mode: Booting your phone in safe mode disables third-party apps. If the issue doesn’t occur in safe mode, then a third-party app is likely the cause. You can uninstall apps one by one to identify the culprit.
Ensure you back up your data before performing any major changes.

A likely reason your screen goes black during calls is an issue with the phone’s firmware. Manufacturers release firmware updates to fix bugs and improve functionality. If your phone hasn’t been updated recently, it might be operating on outdated firmware, which can cause the proximity sensor to malfunction. Here’s how to ensure your firmware is up to date:

1. Check for Updates: Go to your phone’s settings, navigate to the ‘Software Update’ section, and check for any available updates. If there are updates available, make sure to download and install them.

2. Factory Reset: If updating doesn’t work, as a last resort, you can try doing a factory reset. This will erase all your data and return the phone to its original settings, so make sure to back up any important information before proceeding. After a reset, your phone might have a fresh configuration that could solve the black screen issue.

Updating the firmware can fix many software-related issues, including those affecting the proximity sensor, providing a more stable and responsive phone during calls.

The black screen issue during calls can stem from several hardware and software interactions. Let’s delve into multiple reasons and perspectives:

Hardware Issues:
1. Proximity Sensor: Low-quality or old screen protectors can obstruct the sensor, causing the screen to turn black unnecessarily. Ensure you use compatible, high-quality protectors, and clean your screen, particularly around the sensor area.
2. Battery Health: An aging battery might cause the phone to try and conserve power during calls, thereby turning the screen off. Replacing the battery can be a solution if this issue frequently occurs alongside quicker battery drains.

Software Glitches:
1. Outdated Software: Keeping your phone’s operating system updated ensures you have the latest bug fixes and functionalities. Regularly check for software updates.
2. Application Interference: Third-party applications, especially those related to calls, can interfere with the proximity sensor’s operation. To check this, start your device in safe mode. If the problem doesn’t occur, it means an app is likely the culprit. Begin uninstalling recently installed or suspect apps to identify the misbehaving application.
3. Resetting Settings: Sometimes, configurations in the device’s settings can cause unintended issues. Perform a settings reset to eliminate misconfigurations without losing your data.

Environmental Factors:
1. Temperature: Extreme temperatures can affect your phone’s performance, including its sensors. Ensure you aren’t using your device in overly hot or cold environments.
2. Obstructions: While it might seem trivial, using your phone with wet hands or in dirty environments can sometimes obstruct the screen or sensor, causing it to malfunction during calls.

Steps to Diagnose and Potentially Fix the Issue:
1. Test the Proximity Sensor: Most smartphones have a testing mode. For example, on Android phones, you can dial *#*#4636#*#* to enter test mode, or use specific sensor test apps available on Google Play.
2. Inspect and Clean the Sensor Area: Use a soft, dry cloth to gently clean the screen, especially around the sensor.
3. Adjust Screen Protector: If your protector doesn’t fit precisely, consider resizing it or purchasing a more compatible one.
4. Calibrate the Sensor: Some advanced settings allow you to recalibrate the sensors. This can sometimes resolve sensitivity issues.

Consult Professionals:
1. Repair Shops: If you’re not comfortable with attempting fixes or if they don’t work, consult a professional technician. They can provide more sophisticated diagnostic tools.
2. Manufacturer Support: Contacting your phone’s manufacturer through official support channels can provide insights and fixes tailored specifically to your device model.

This comprehensive approach should cover the multiple angles from which you need to investigate the black screen during calls. By assessing software, hardware, and external conditions, you can identify the root cause and address it effectively, ensuring seamless call experiences.

One common reason your screen goes black during calls is the proximity sensor malfunctioning. The proximity sensor, typically located near the top of your phone, detects when your face is close to the device during a call and turns off the screen to prevent accidental touches. If this sensor is blocked by a screen protector or a dirty screen, it might not work correctly. Cleaning the screen and ensuring the sensor area is clear might resolve the issue.