Buying a smartphone from hand or checking the device after a fall requires careful diagnosis, especially when it comes to the popular model Redmi Note 6 Pro. This gadget, released by Xiaomi, has proven to be a reliable device, but time and intensive use can reveal hidden defects. Comprehensive inspection will help to avoid buying illiquid or detect a malfunction before the end of the warranty period.
There are many ways to assess the technical condition of the device, from visual inspection to the use of special engineering codes. In this article, we will examine each step in detail, paying attention to key nodes, such as display matrix, battery and communication modules. A competent approach will allow you to objectively assess the health of the smartphone.
Before you start complex tests, you need to do an initial external inspection of the case and a basic on-board check, and it's often at this stage that experienced users discover autopsy marks or unoriginal parts that the seller may have hidden. Let's start with fundamental steps that don't require the installation of additional software.
External inspection and basic diagnostics of the body
The first thing to look at is the condition of the case and glass. The Redmi Note 6 Pro has a metal case with plastic inserts on top and bottom, which can peel off or crack over time. Carefully examine the joints between the screen and the frame: the presence of gaps or glue traces often indicates an unqualified display replacement.
Check all physical buttons, volume and switch on, and they need to be clear, resilient without jamming, and if the power button fails or requires excessive force to activate, it may indicate mechanical damage to the plume or the microswitch itself inside the device.
- 🔍 Examine the Micro-USB charging connector for oxidation or deformation of the tongue inside.
- 🔍 Check the speakers by covering the holes with a grid, for dust and moisture.
- 🔍 Evaluate the condition of the cameras: the lenses should be clean, without scratches and dust inside the module.
⚠️ Warning: If you see screws with threads ripped off or screwdriver marks on near connector screws, the device most likely opened. This may mean loss of moisture protection (although it is conditional here) and the risk of poor build.
Pay special attention to the back cover. On the Redmi Note 6 Pro, it's plastic and prone to microcracks when falling, even if the glass is intact. Swipe your finger over the surface: any irregularities may be a sign of hidden defects. SIM-maps: it should be inserted smoothly, without distortions.
Authentication and technical specifications
The electronics market is full of copies and restored devices, identifiable as originals. To make sure that you are looking at the Xiaomi Redmi Note 6 Pro, and not a clone with modified firmware, you need to check the specifications, the easiest way to do this is through the built-in system or third-party utilities.
Go to the settings menu and select About Phone, which lists the processor model, RAM and internal memory, the original device is based on the Qualcomm Snapdragon 636 chipset. If the system shows a different model of the processor or the amount of memory does not match the stated (for example, 3/32 GB or 4/64 GB), this is cause for doubt.
To get a deeper look, use the engineering code. Type in the Phone app the combination ##6484##. This will open the CIT (Customer Information Test) menu, which is the standard for diagnosing Xiaomi devices. The presence of this menu is a good sign of the originality of the firmware, although it may be hidden on some global versions.
| Parameter | Original Redmi Note 6 Pro | Signs of counterfeiting/repair |
|---|---|---|
| Processor | Snapdragon 636 (MSM8953) | MediaTek or an unknown vendor |
| Screen. | IPS, 1080 x 2280 px | Low resolution, TN-matrix |
| Camera (main) | 12 MP + 5 MP | Interpolated 2 MP |
| Charging. | Quick Charge 3.0 | Lack of fast charging |
You can also install a CPU-Z or AIDA64 app, which will show detailed hardware information, including actual screen resolution, battery type, and sensors, and if the Device section displays the name of another smartphone (like the Redmi Note 5), it means that the firmware has been modified by software.
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Be sure to check. IMEI-code on the box, check and system (typing *#06#) The coincidence of all three values is the main sign of the legal purity of the device.
Diagnostics of the display and sensor
The screen is the most vulnerable element of any smartphone.The Redmi Note 6 Pro uses the same device. IPS-A matrix that is color-rendering but is prone to broken pixels and uneven backlighting. To check, turn on a fully white image and carefully examine the screen at maximum brightness.
The dead pixel test can be done by switching colors (black, red, green, blue, white). points that do not change color or burn differently from the surrounding area are considered defective. A single batted pixel may be within the manufacturer's normal range, but their presence in the center of the screen is critical.
The touchscreen is checked in the CIT engineering menu. Choose the Touchpanel test. You'll be asked to swipe through the circuits of the squares. The line should be continuous and follow your movement accurately. If a line is interrupted or shaking in certain areas, the sensor is not working properly in that area.
- 🎨 Check the uniformity of the backlight on a black background in a dark room.
- 🎨 Rate viewing angles: Colors should not invert when viewed from the side.
- 🎨 Multi-touch test: Try moving multiple icons at the same time.
⚠️ Warning: If you press the screen and you hear a characteristic crunch or you see iridescent spots, it's a sign of a crushed matrix, and this defect will progress and the screen will soon fail completely.
You should also check the automatic brightness control, turn on the avolight and hold the flashlight to the light sensor (in the upper left corner of the front panel), the brightness should change smoothly, sudden jumps or lack of reaction indicate a malfunction of the sensor.
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The quality of the display directly affects usability. Even if the sensor works, the presence of strong lights or yellow spots makes the operation of the smartphone unpleasant.
Battery Testing and Charging
Battery status is a critical parameter for a used device. Xiaomi Redmi Note 6 Pro is equipped with a battery capacity of 4000 mAh. Over time, the battery life decreases, and it begins to hold a charge worse. You can check the current state through the engineering menu or special applications.
In the CIT menu, select Battery, which shows the current charge level, voltage and status. Note the voltage: if it is well below the nominal charge at 100% (about 4.2-4.35 V), it is possible that the controller is calibrated incorrectly or the battery has degraded.
For a more accurate estimate, use the AccuBattery app. Install it and use your smartphone as normal for a few days. It will calculate the real residual capacity in mAh. If the wear is greater than 20-25%, consider replacing the battery.
adb shell dumpsys batteryThis command in the ADB console (PC connection required) will display detailed battery statistics, including temperature and charging status. The sudden heating of the case in the lower part (where the battery is located) during charging is a worrying symptom.
- 🔋 Check the charging speed: is Quick Charge supported.
- 🔋 Keep track of the discharge in standby mode (should be minimal).
- 🔋 Check the connector for the back of the cable.
Checking cameras, sound and communication modules
The Redmi Note 6 Pro's multimedia capabilities include dual main camera and dual flash front camera. Launch a standard camera app and take some shots in good light and in the dark. Photos should be crisp, without blurring at the edges and foreign artifacts.
Pay special attention to autofocus. Point the camera at the object and press the screen. Focus should be directed quickly and accurately. If the camera is scouring or is making a mechanical crack, the camera module is faulty. Also check the second camera (portrait mode) and zoom.
The soundtrack is tested by recording the recorder and playing music. Turn on the tracks at maximum volume: the sound must be clear, without wheezing or crackling. The speaker is checked by calling another number, the interlocutor must hear you clearly, without interference and echoes.
Stabilization checkpoint
Don't forget to check the communication modules. SIM-map and make sure the smartphone sees the network 4G/LTE. Try calling, sending. SMS And you can access the Internet via a mobile network, and you can check Wi-Fi and Bluetooth by connecting to the router and wireless headphones, respectively (GPS) testable to launch the navigator.