How to check the touchscreen on Xiaomi: diagnostics and tests

Problems with the touch screen of a smartphone can turn even a flagship device into a useless piece of plastic. If you notice that the touchscreen on your Xiaomi reacts with a delay, spontaneously presses applications or completely stops responding in certain areas, you need to urgently diagnose. Ignoring the first signs of malfunction often leads to a complete failure of the display module.

Owners of Redmi and POCO devices often face a situation where a software failure masquerades as a hardware failure. Before you carry the gadget to the service center, you should eliminate software errors and conduct a deep test of the equipment, which will save you time and money, allowing you to accurately determine the nature of the malfunction.

In this article, we will look at all the available methods of verification, from built-in engineering menus to third-party utilities, you will learn how to distinguish a dead zone from a software error and what to do if the screen behaves inadequately.

⚠️ Warning: Before any manipulations begin, be sure to create a full backup of the data.The tests can cause random clicks that will result in deleting files or changing settings.

External examination and primary diagnosis

The first step should always be to visually analyze the surface of the screen. Even microscopic cracks, invisible when the display is off, can disrupt the capacitive layer.

Often, the cause of a "glutty" touch is protective films or poor-quality glass. If you use a thick protective glass, it can interfere with the sensor, especially if it is damaged or glued to air bubbles.

• 🔍 Remove the protective glass and wipe the screen with a soft cloth to eliminate the effects of contamination.
• 🔌 Turn off the charger as power surges on the network can cause "phantom" presses.
• 🧤 Check the screen without a case that can press on the verge of the display.

Pay special attention to the edges of the screen, which is where the most common damage occurs after falls, and if there are no visual defects, but the problem persists, we move to software tests.

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Use a wet but not wet electronics wipe to remove static electricity, which sometimes affects sensor sensitivity.

Using the CIT Engineering Menu to Check

The most reliable way to test a touchscreen on Xiaomi is by using the built-in CIT (Customer Information Test) menu, which is available on all devices of the brand and allows you to test each component separately.

To enter the menu, you need to open the standard Phone app and type a special code. Most Xiaomi, Redmi and POCO models have a combination of ##6484##. If the code does not work, try ##64663## or go through the settings.

Once you enter the code, you'll see a list of tests, and you'll find Touchpanel or TP Test, and you'll be asked to swipe all the lines on the screen, and if the line is green, the sensor is in good shape.

It's important to get the test done. Sometimes the sensor can be centered, but it can have dead zones around the edges that you wouldn't notice in normal use. If even one line isn't green, it indicates a hardware problem.

⚠️ Note: Do not press the Pass button unless the test is complete, which may lead to incorrect retention of diagnostic results.

Multi-touch and sensitivity testing

Modern Xiaomi smartphones support multi-touch, allowing the screen to respond to multiple touches at the same time, a feature that is important for gamers and those who actively use gestures.

There are specialized sites and applications that show the number of simultaneous touches, so just open a test in your browser and touch the screen with a few fingers, and the tags should appear on the screen.

If the device registers fewer touches than you do, or the points "shake" and shift, this is a sign of degradation of the digitizer.

Pay attention to the behavior of the cursor or touchpoint, and if it flies away from the actual touch, you need to calibrate or replace the module.

Calibration of the touchscreen on Xiaomi

If the tests show small errors, but the screen continues to work, calibration can help.In the shell of MIUI and HyperOS, there is no separate button "Calibration" in the regular menu, but there are hidden methods.

One way to do this is to use the engineering menu that we talked about above, and some versions of CIT have a "Calibration" option, and follow the instructions on the screen by clicking on the dots that appear.

An alternative method is to reset the settings through recovery, but this is a last resort, most often a simple reboot or upgrade to the latest version helps, since manufacturers often release patches that improve the sensor.

Using third-party apps from Google Play (like Touch Screen Test) can give more detailed statistics, but doesn’t always have access to deep hardware settings, unlike system utilities.

Programmatic Conflicts and the Impact of Updates

Sometimes the problem isn't hardware, it's software. Conflicting apps or bugs after an Android update can cause input lags. Check if the screen's weird behavior has occurred after you install a new program.

Try to start your smartphone in Safe Mode. To do this, press the turn off button, and then hold your finger on the Turn off icon on the screen for a long time. Only system applications work in Safe Mode.

• 📱 If in safe mode touchscreen works perfectly, the third-party application is to blame.
• 🗑️ Remove newly installed programs one by one, checking the result.
• 🔄 Check for system updates in the Settings menu → The phone.

Often users forget that crowded memory also affects the sensor's response rate, and if the storage is packed, the system doesn't have time to process touches in time.

⚠️ Warning: Installing touchscreen apps from unreliable sources can cause the device to become infected with viruses.

Hardware causes of malfunctions

If the software methods didn't work, it's probably a physical problem, the touchscreen plume could have moved away from the board, especially if the phone had recently fallen, and the power controller itself or the digitizer could have failed.

A critical sign of hardware breakdown is the appearance of colored spots, stripes, or a complete lack of response to pressing in certain areas, regardless of reboots.

Moisture is another enemy. Even if the phone has water protection, the leakage is broken over time, and the moisture that gets under the screen causes the touchscreen contacts to close, leading to chaotic pressing.

In such cases, self-repair is possible only with the experience and tools, most often requiring replacement of the display module in the assembly, as in modern Xiaomi glass and sensor are soldered into a single unit.

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If CIT-test shows broken zones, software methods are powerless - a replacement of the display module is necessary.

Frequently Asked Questions (FAQ)