Checking the work of the IR-cooler Xiaomi through a smartphone

Modern Xiaomi smartphones often feature an integrated infrared transmitter, which makes the device a universal tool for controlling household appliances. Users regularly face the need to check whether the IR port is functioning correctly, especially after a gadget drops or a firmware update. Visually determining the work of invisible radiation is impossible, so specific diagnostic methods are required.

In this article, we will discuss how to use another phone’s screen or camera to check the signal, and also consider software methods for testing through system utilities. You will learn why a standard camera may not see radiation and what technical nuances to consider when diagnosing, this will help you quickly understand whether your device needs repair or simply reconfigure the application.

Some budget models may lose this feature, so the first step should always be to verify the hardware component in a particular phone modification. If the physical port is present but not working, the problem may lie in a software driver failure or mechanical damage to the diode.

Confirmation of the presence of an IR port in the device

Before you start testing the signal, you need to make sure that your Xiaomi or Redmi smartphone is indeed equipped with an infrared transmitter. In specifications, this feature is often denoted by the acronym IR Blaster. The absence of this module makes it impossible to use the phone as a remote, regardless of the installed applications.

You can check for hardware through the official specifications on the manufacturer's website or on the About Phone menu, and the indicator is the presence of a black oval or round element on the upper end of the device body, and it is through this infrared diode that commands are transmitted to the TV.

• 📱 Visual inspection of the upper end of the smartphone for a dark glass window.
• 📄 Study the full model specification on the official Xiaomi portal.
• ⚙️ Checking for pre-installed Mi Remote application in system set of utilities.
• 🔍 Search for models in GSMArena or Yandex.Market databases with the filter "IK-port».

⚠️ Note: Having a Mi Remote app in the Play Market does not guarantee an IR port on your phone.The app can work over Wi-Fi for compatible TVs, but it needs a physical module to emulate a classic remote.

It is worth noting that in the flagship series of recent years, the manufacturer sometimes refuses to install an IR module in order to increase the space for the battery or other sensors, so even expensive models require preliminary verification of the configuration.

Visual inspection through the camera of another device

The most affordable and reliable way to test the performance of an infrared emitter is to use a camera from another smartphone. Most cameras are sensitive to infrared spectrum, which is invisible to the human eye. When you press the buttons on the remote, you will see flashes of purple or whitish light on the screen of the receiving device.

To do the test, run the camera on the second phone and point the lens over the top end of the Xiaomi being tested. Press any button in the Mi Remote app or turn on emulation mode. If the IR port is working, bright flashing signals will be visible on the camera screen.

So if you can’t see the signal on the main camera, try using a front camera, which has less of such filters.

Software Diagnostics through Engineering Menu

To test the system components in depth, you can use Xiaomi’s hidden engineering menu, which allows you to test hardware without connecting third-party devices, accessing the menu through a special set of commands in the Phone app.

Type ##6484## or ##4636## into the dialer. The CIT (Customer Interactive Test) list will open. Find the item associated with the IR or Infrared. In some versions of the MIUI or HyperOS firmware, this test may be called the "IR Test."

When the test is started, the system will prompt you to press a button to check for radiation, if the module is working, the phone may vibrate or make a confirmation sound, and the lack of response in the engineering menu often indicates a critical driver failure or a physical component failure.

⚠️ Warning: Be careful in the engineering menu. Changing unknown parameters can cause radio modules or the system to malfunction. Use only the testing function (Test), do not change the settings (Set/Config).

Using the Mi Remote application for testing

The Mi Remote app has built-in feedback mechanisms to help you know if a signal is being sent. When you add a new device, the app makes a series of test queries, and if the TV responds to test commands, the IR transmitter is functioning normally.

Launch the app and select Add Remote. Select the type of TV device and the brand of your TV. The app will show buttons (like power on), you will press them and monitor the response of the equipment. Successful response confirms the health of the hardware of the smartphone.

• 📺 Start Mi Remote and create a new remote profile.
• 🔘 Click the Power button in the app by directing your phone to TV.
• ✅ If the TV is turned off / on, the port is operational.
• ❌ If there is no reaction, try other codes from the lists offered.

Sometimes the problem is not the phone, but the wrong code base for a particular TV model, in which case the infrared signal may be sent, but it may not be the right information for the receiving device.

Analysis of possible failures and failures

If the camera visual check shows flashes but the TV doesn't respond, the problem may be software. Often after the MIUI update, the permission settings for the remote application are confused.

In cases where the camera does not see radiation at all, even when other functions of the phone are working, there is a high probability of mechanical damage to the IR diode. Falls, moisture or simply a production defect can cause the component to fail, and it is also worth checking whether the port is not closed with a protective case or sticker.

The following factors can affect job stability:

• 🔋 Energy savings: Ultra Battery mode can turn off background IR port services.
• 📱 Application conflict: third-party remotes can block access to hardware.
• 🌡️ Overheating: At critical temperatures, the system may limit the operation of modules.

⚠️ Warning: Do not attempt to disassemble your smartphone to clean the IR port yourself if the device is warranty-free.This will result in a loss of warranty obligations.

Third-party applications for advanced diagnostics

If standard methods are not clear, you can use specialized software from Google Play. Apps like IR Tester or Quick IR allow you to speed up the signal and test the frequencies. They are useful when the Xiaomi app is running incorrectly.

Install a tester app, select a device type, and press the transmission button. These utilities often have a simpler interface and allow you to quickly verify the physical health of the diode. They send standard signals that most TVs understand.

However, it is worth considering that third-party software may not have access to the full functionality of the IR port on some versions of Android due to security limitations of the system.

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The combination of visual camera testing and Mi Remote testing gives you 100% guarantee of IR status.

Frequently Asked Questions (FAQ)