Buying a tablet, especially in the secondary market or in conditions of sale of inventory balances, always involves the risk of running into a poor product or device with hidden defects. Xiaomi offers excellent devices, but even among them you can find instances with problems that are not visible when you look at the storefront.
In this article, we will analyze a step-by-step algorithm of actions that will help you identify a repainted screen, a “tired” battery or a restored case. You should not rely only on the appearance of the package or the seller’s assurance, since the technical condition of the gadget is more important than its presentability.
External inspection of the body and configuration
The first thing that starts with testing is to look at the look of the device, and the body of the tablet should not have deep scratches, chips or dents that would indicate a fall, and pay special attention to the angles and faces, which are the ones that take the brunt of the fall.
Check the density of all the elements. The back cover should not luft or creak when pressed lightly. If the tablet has a metal body, swipe your finger along the joints - there should be no sharp burrs or visible traces of poor build characteristic of artisanal repairs.
⚠️ Note: If you notice that the screws on the lower edge have unscrew marks (scratches on the hats), and the seller claims that the device “has never been opened”, this is a clear sign that the tablet has visited the service center.
The package also plays an important role: in the original Mi Pad or Redmi Pad, all elements are tight and neat, the charger must meet regional standards (European fork for Russia) and have a clear label with the manufacturer's logo.
- 🔍 Cable USB It should be flexible, without clamps and have a brand logo on the connector.
- 📦 Instructions and warranty card must be printed on quality paper without blurred text.
- 🛡️ The screen protector film (if any) should be glued flat, without bubbles and dust underneath.
Detailed diagnosis of the display and touch screen
The screen is the most expensive and vulnerable component of the tablet. When buying, it is important to check not only the presence of broken pixels, but also the quality of color reproduction, as well as the operation of the touch layer.
To check for broken or stuck pixels, it is best to run a special image of white, black, red, green and blue. On a monochromatic background, foreign dots are best seen. Also pay attention to the uniformity of the backlight: there should be no strong lights at the edges or in the center.
How to do a screen test without apps?
The touchscreen is checked by dragging the icon across the screen area, swiping your finger from corner to corner in different directions, and if the icon sticks or the cursor twitches in some area, there is a sensitivity problem in that part of the matrix.
⚠️ Caution: Cheap screen copies often have “dead zones” around the edges and an unnaturally cold, bluish shade of white that cannot be corrected with settings.
Checking the functionality of buttons and connectors
Mechanical controls require special attention, as repairing them can be difficult. Volume and on buttons must have a clear, ringing stroke. If the power button fails or has a backlash, this can lead to problems with the device turning on in the future.
All connectors must be checked for performance. Connect the charger to a USB-C or Micro-USB port - it should be tightly locked, without a bolter. Try inserting the headphones into a 3.5mm jack (if any) and play back the sound.
☑️ Express interface check
The speakers are checked by playing the music track at maximum volume. The sound must be clean, without wheezing, rattling or interruptions. The microphone is tested through a recorder: write down a short phrase and listen to it.
Hardware: processor, memory and heating
To make sure that the internal specs are up to date, you need to look at the system settings. Often unscrupulous sellers change the software data to make the cheap tablet appear as a flagship model.
For a deep check, the best way to install the CPU-Z or AIDA64 app is to show the real name of the processor, the number of cores, the frequency and type of RAM, and compare this data with the official specifications of your Xiaomi model on the manufacturer's website.
| Parameter | What to check | Normal value. |
|---|---|---|
| SoC / CPU | Processor model | Qualcomm Snapdragon / MediaTek Helio |
| RAM | RAM capacity | Complies with the stated (3/4/6 GB) |
| Device Model | Model code name | For example, Dagu for Pad 6 |
| Temperature | Temperature in plain | 30-40°C (depending on the medium) |
Be sure to test the device under load. Run a heavy app or a high-graphics game for 5-10 minutes. The tablet may get hot, but it shouldn't heat up to a point where it can't be held in your hands, and it certainly shouldn't shut itself off.
💡
A sharp drop in performance or heat in simple tasks (browser, menu) often indicates battery wear or cooling system problems.
Diagnosis of the battery
Battery condition is one of the key factors when buying used equipment. Android does not have a built-in accurate charge cycle meter that is easily accessible to the user, so you will have to resort to indirect methods of verification.
Go to the settings and look at the battery usage statistics. If the tablet is new, the wear rate should be minimal. If the device is several years old, pay attention to the discharge rate. A sharp drop in charge from 20% to 0% is a sure sign of the degradation of the Li-Ion element.
Also check the device's behavior while charging. The tablet should charge evenly, without percentage jumps. If the charging connection turns the screen off or the device reboots, the problem may be in the power controller or the battery itself.
IMEI and device status check
Every legal tablet has a unique IMEI identifier, which can be found on the box, in the system menu (Device About section), and by typing *#06# into the dialing field.
IMEI checks to see if the device is wanted, locked by the operator, and is an original Xiaomi product, using official verification services on the manufacturer’s website or third-party databases.
*#06#Enter this command in the Phone or Calls app to see the service menu with information about IMEI. If the number is displayed with “Null” or “000000000000000000000”, this is a sign of firmware or a serious hardware malfunction.
💡
Save a screenshot of the IMEI screen and serial number immediately after checking, which will help in controversial situations if the seller decides to deny what he said.
Software and resetting settings
Before making a final purchase, make sure that the tablet doesn’t have malware or hidden miners that can slow down.The best way to check the purity of the system is to perform a full factory reset right at the seller’s.
This action will delete all accounts, passwords and personal data of the previous owner.If the seller categorically refuses to make a reset, citing a "long update" or other excuses, this is an occasion to think about the integrity of the transaction.
⚠️ Note: After the reset, the device may ask you to enter a Google account that was previously synced with it (protection) FRP). Make sure the seller remembers the login details or unties the device completely from their account.
Check the version of the operating system MIUI or HyperOS. The outdated version may indicate that the tablet has not been updated for a long time, or that a custom (unofficial) firmware is installed, which may not work stable.