Tutorial for using the secret hardware testing menu

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If you suspect something's wrong with your phone or computer, there's a secret hardware testing menu that very few people know about. It lets you check sensors, the screen, sound, connections, and other components without installing anything extra. Technicians use it daily, but any user can take advantage of it to detect real problems and rule out unnecessary worry.

In this tutorial, you'll learn how to use both the quick and advanced diagnostic tools included in many PCs (like those from Dell) and the hidden testing menus on Android phones from popular brands such as Samsung and Xiaomi. You'll see what the results mean, what to do if an error occurs, and what precautions to take to avoid messing things up by changing sensitive settings.

What is the secret hardware testing menu and what is it used for?

When we talk about a secret test menu, we're referring to a series of diagnostic tools integrated into the device itself , usually hidden so that the average user doesn't change sensitive system settings. From there, tests can be run on each piece of hardware: screen, speakers, microphone, vibration, motion sensors, wireless modules, memory, hard drive, etc.

On computers, these tests are usually available in a pre-boot environment, a pre-start hardware diagnostic that opens before Windows or any other system loads. On Android phones, however, they are almost always accessed with secret codes entered in the phone app or through combinations of taps in the settings.

The purpose of these menus is to help you confirm whether a problem is truly hardware-related and not simply a software, configuration, or app-specific issue. This way, if something is flagged as faulty in the diagnostic, you have a solid basis for processing a warranty claim, repairing the device, or taking more serious action.

In addition, many manufacturers combine these menus with options to report the problem , such as QR codes, error codes, and links to technical support, making the troubleshooting process faster and clearer, even for inexperienced users.

Pre-boot diagnostics on computers: quick and advanced tests

Many PCs, especially Dell systems, include a comprehensive pre-boot diagnostic tool that starts before the system loads. This utility includes a quick test, an advanced test, and several informational sections about the system's status, firmware, and previous test logs.

The quick test is designed to give you an overview of the system's health in just a few minutes, while the advanced test allows you to select in detail which components you want to examine and even activate a comprehensive mode for a deeper analysis of the hardware.

Rapid test results: how to interpret them

Once the quick test is complete, the tool displays a clear result on the screen with several possible options. In the best-case scenario, you'll see a message indicating that all tests have been successfully completed . When this happens, you typically have three paths:

• Scan the QR code that appears on screen to provide additional help, explanations of what has been reviewed, and advice for the next step.
• Choose the option EXIT in the lower right corner to exit the diagnostic and restart the computer normally.
• Select ADVANCED TEST in the lower left corner if you want to delve deeper into a specific component even if, in principle, everything has gone well.

If instead of a general OK message a warning appears, the screen will indicate which part of the hardware has malfunctioned . In this case, the recommended actions are usually:

• Access to specific troubleshooting articles Organized by error ranges, locate your specific code and follow the proposed steps.
• scan the QR code to report the problem and provide data to support.
• Go to section System performance check prior to boot from SupportAssist, noting the error code, validation code, and service tag that appear on the screen.
• contact him official technical support using those same codes, which allow the technician to instantly understand what has failed.

These steps ensure that you don't just end up with a simple error message, but that you have a clear workflow to diagnose and solve the problem, either on your own using the manufacturer's guides or with direct support help.

Advanced diagnostic testing: total control over what is analyzed

The advanced testing section is much more flexible. By default, when you access it, the tool selects the "Select all" box to select all tests . This means that, if you don't change anything, the entire set of components available on the computer will be analyzed.

If you only want to test a specific component, the first thing you should do is uncheck the "Select all" box and then manually choose the components you want to test. The screen will list all available tests, which may vary depending on the hardware installed in your Dell computer (not all models have the same options).

Additionally, there's a checkbox called "Thorough mode" that runs a more thorough test on the selected hardware. Selecting this option will provide a more in-depth diagnosis, but it may also take significantly longer to complete—something to keep in mind if you're in a hurry.

To start the test, simply click on RUN TEST . For Dell laptops, there's a key point: user interaction is required during the LCD screen test . The tool will ask you to confirm whether you can correctly see certain color patterns or images, so pay attention and don't leave the computer unattended.

When the analysis is complete, the behavior is very similar to that of the quick test. If all checks have passed, you can choose to scan the QR code, press EXIT to restart, or return to a QUICK TEST using the option in the lower left corner. If the system detects errors, you will see a message specifying the affected component, and you will be offered the same support options: troubleshooting articles, a QR code, a link to the SupportAssist performance check, and access to options for contacting technical support.

Other PC hardware diagnostic resources

In addition to the quick and advanced tests, the pre-boot diagnostic tool offers several very useful information tabs to get a complete picture of the equipment's status and test history.

Configuration tab: system information

Within the menu, if you select the SYSTEM INFO option on the left , you will have access to the Configuration tab. This displays system configuration details, such as information on detected hardware, installed devices, and other parameters that are useful for verifying that everything is being recognized correctly by the firmware.

This view doesn't perform tests itself, but it's useful for verifying that the components appear as they should , which is essential before blaming Windows or the drivers. If something isn't even listed in the configuration, the problem lies at a lower level.

Health tab: overall system health

In the same SYSTEM INFO section, another important tab is Health . This summarizes the overall condition of various subsystems: storage, memory, battery (on laptops), temperature sensors, etc. It's like a control panel for the computer's "health."

If any component shows abnormal values ​​or previous errors, the Health tab will likely tell you, allowing you to take action before the problem worsens , for example, by replacing a disk with damaged sectors or checking the cooling if temperatures are excessive.

Firmware tab: version and components

Another section accessible from SYSTEM INFO is the Firmware tab . This displays BIOS/UEFI versions, firmware for embedded devices, and, in some cases, options related to updates or security status.

This information is crucial when the manufacturer recommends updating the firmware to fix bugs or improve compatibility. Before applying any update, it's always advisable to check which version you have installed and, if necessary, back up or write down your settings.

Records of previous diagnostic tests

Finally, in the left-hand menu you'll find the LOGS option , which gives you access to the diagnostic logs tab. This stores the results of previous tests, including dates, components checked, and, in many cases, error codes or the status of each test.

This section is very useful for tracking the evolution of a problem over time , seeing if an error recurs, or if it first appeared after a specific change to the equipment. It also allows technical support to quickly understand the failure history without having to start all over again.

Equipment and products compatible with these tests

Pre-boot diagnostic tools are typically available on a wide range of the manufacturer's desktop and laptop computers . In the case of Dell, for example, they cover families such as Alienware, Inspiron, OptiPlex, Vostro, XPS, Latitude, desktop and mobile workstations, All-in-One PCs, and various professional lines such as Dell Pro, Dell Pro Max, Dell Pro Rugged, and Slim, Tower, and Micro variants.

This means that the vast majority of modern devices from the brand include some type of integrated diagnostic system . The specific menu layout may vary depending on the model and generation, but the general philosophy of quick and advanced tests and system information remains fairly consistent.

Secret diagnostic menu on Samsung phones

In the Android world, Samsung stands out for including a hidden diagnostic menu accessed via a code in the phone app. This menu allows you to test sensors, the screen, sound, vibration, and other device functions without having to install third-party apps.

Its purpose is exactly the same as on PCs: to verify that the Galaxy phone's hardware is working properly and easily locate any physical faults. It's especially useful when you notice something isn't responding, but you're unsure whether it's an app problem or a hardware issue.

How to access the diagnostic menu on Samsung

Accessing this menu is very straightforward. Just follow these basic steps:

• Open the phone app on your Samsung mobile and place yourself on the dial pad.
• Enter the secret code *#0*# Exactly, without pressing call at the end on most models.
• Wait a few seconds for it to open automatically. diagnostic menu onscreen.

Once the menu appears, you'll see a mosaic with many options: color tests for the screen, touch tests, vibration, speakers, proximity sensors, camera, etc. Simply tap the function you want to test to start its corresponding test.

What can you try on a Galaxy with this menu

One of the great advantages of this system is that it allows you to check virtually all the key components of the phone. Among other things, you can test the accelerometer and other motion sensors , verify that the touchscreen responds across its entire surface, and check the vibration, speakers, microphone, and cameras.

For example, the touch test typically displays grids or lines that you must trace with your finger , so if any area isn't marked, it's clear there's a dead zone on the screen. In the case of vibration, the phone activates and you can feel whether it's working or not, while the sound tests play tones to confirm the speakers' functionality.

At the end of each test, Samsung's system will clearly indicate whether the component is considered to be working correctly or if any anomalies requiring attention have been detected. It's not as detailed a report as on a PC, but it's more than enough to determine if it's worth contacting technical support.

Since these options are part of the system, their behavior may vary slightly between Android or One UI models and versions, but the general idea of ​​performing quick tests on each hardware module remains the same.

CIT menu and secret hardware test on Xiaomi phones

Xiaomi phones, including many MIUI variants, also integrate a secret hardware test menu often known as the "CIT Menu." From there, you can run tests on the screen, connections, vibration, and more, just like on other brands, but with a slightly different approach.

This menu is kept very hidden because it offers so many options and settings that, if touched without knowledge , can cause changes that are difficult to undo. It's not just for testing; some models also have internal settings that are best left untouched.

Why is the CIT menu hidden?

The main reason Xiaomi hides this menu is that it allows for changes to deep system behaviors and falls under the category of hidden settings . A setting accidentally enabled or disabled can cause the phone to malfunction, even if you later revert to that setting.

Although MIUI includes certain checks to minimize risks, the company prefers that these types of tools be reserved for advanced users or technicians. From the perspective of the average user, the wisest course of action is to use the CIT menu only for basic testing, following clear instructions and without tinkering with settings you don't understand.

How to access the Xiaomi CIT menu step by step

Accessing the secret hardware menu on Xiaomi devices can vary between models, but there's a fairly common path through the system specifications. The typical process is as follows:

• Enter the phone settings and locate the device information section.
• Access the section called “All specifications” or similar, where details such as processor, memory, storage, etc. are listed.
• Scroll down until you find the field “Kernel Version” or “Core Version”, whose name may vary depending on the model and version of MIUI.
• Click on that section five times in a row, quickly and without stoppingAfter the fifth press, the CIT or hardware test menu should open.

Once inside, you'll see a list of available components and tests. The system may offer a blue button to launch an automatic test that runs through each of the phone's modules one by one, or you may have to select each test manually.

How the tests work and what PASS and FAIL mean

When you start the test, the phone will check each component in a predefined order. In many cases, messages in English will appear asking you to touch the screen, press physical buttons, or move the device so the test can validate its functionality.

Since many of the instructions and results are in English, it might be helpful to have a translation app handy if you're not fluent. However, the most important keywords are easy to recognize:

• PASS indicates that the test has been successfully completed and that the component is considered to be in good condition.
• FAIL This means the test has failed, which is usually interpreted as a malfunction or a possible breakdown.

Throughout the process, the system will display these results for each hardware component. If you see multiple FAILs, it's a clear indication that the device may need repair , parts replacement, or at least a more thorough inspection by a technical service technician.

Most useful secret codes on Xiaomi phones

In addition to accessing the device via the kernel version, Xiaomi phones have several secret codes that are entered in the phone app to access hidden features. Some of the most interesting are the following:

• *#*06#: Instantly displays all information related to your mobile's IMEI, very useful in case of loss or theft to identify the device.
• * # * # * # * # 426: allows you to see detailed data about the Google Play services, connection and diagnostic information related to them.
• * # * # * # * # 4636: opens a menu of advanced information about the connectivity and Wi-Fi network statusIt includes options to "Ping" and check the actual quality of the internet connection.
• * # * # * # * # 225: teaches data related to the device calendar, number of events, plans and other internal statistics.
• * # * # * # * # 6484: access directly to Xiaomi's secret menu and hardware testssaving you the steps of navigating through specifications and kernel version.

These codes are powerful tools for exploring and diagnosing your phone, but it's important to use them responsibly and understand the purpose of each menu . If you have any doubts, it's advisable to consult reliable guides or ask in specialized communities before changing anything.

Tips and precautions before using the secret test menus

Although these diagnostic menus are very useful, they are still tools originally designed for technicians . Therefore, before diving into them, it's advisable to keep in mind some recommendations to avoid unpleasant surprises.

First, keep in mind that tests, especially the more intensive ones, can put a lot of strain on the hardware : they put the processor, memory, sensors, and battery to work. If your device is already showing serious symptoms, it's a good idea to monitor the temperature and avoid running very intensive tests for hours unnecessarily.

It's also important that, if you're unsure what an option does, you don't change settings that aren't part of a simple test . On a PC, it's safest to just run tests and check the results. On mobile devices, avoid advanced menus that allow you to reconfigure factory settings, perform delicate calibrations, or use functions that the manufacturer doesn't document for the end user.

If you ever encounter an error message you don't understand, always note down error codes, service tags, and firmware versions . With this information, official support or technical communities will be able to help you much more accurately and quickly.

In specialized online communities, such as those for users of certain brands, it is very common to recommend consulting first before running certain advanced tests , especially if the device is under warranty or if you have doubts about the impact a specific test may have.

By combining official, fast, and advanced PC diagnostic tools with the hidden hardware menus in Samsung and Xiaomi mobile devices, any user can detect real faults in their devices without relying solely on third-party applications . Used judiciously and with the ability to interpret the results (OK, PASS, FAIL, error codes), these menus become a perfect ally for extending the lifespan of your devices and making better decisions when it's time to repair or replace them.