How to distinguish screens Xiaomi Redmi 4 Pro: matrix codes and quality features

Owners of the popular Xiaomi Redmi 4 Pro (also known as Prima) smartphone often face the need to replace a broken or leaked display. However, the parts market is full of modifications, and even experienced craftsmen sometimes get confused in the labeling. The main difference lies not only in the price, but also in the matrix used, which can be produced by different suppliers for the same device.

Incorrectly selected part can lead to color distortion, decreased brightness or problems with the touchscreen. OEM-This article will help you identify the component by code and appearance.

Many users are unaware that Xiaomi has changed parts suppliers for one model at different times, so when you open the device, you can find a matrix with completely different characteristics than the previous version, identification begins long before you install a new part in the case.

Main types of matrices for Redmi 4 Pro

The first thing to understand: display module for Xiaomi Redmi 4 The Pro is a prefabricated structure consisting of glass, touchscreen and the matrix itself. IPS-resolution panel 1920×1080 But the technology of pixels. LED-The lighting and pixel density may vary.

The most common matrices are those with codes beginning in FPC or DSI, which indicate the type of plume and connection interface, and the differences between them may not be obvious to the naked eye, but are critical to firmware and controller compatibility.

There is also a division by type of assembly: framed and non-framed modules, framed assembly modules are usually easier to install because they don't require glass repainting or electronics transfer, but these are the ones that most often get low-quality copies.

• 📱 Original modules – have clear marking, high-quality assembly and perfect color reproduction.
• 🏭 OEM-Substitutes – may have differences in shades of white and less maximum brightness.
• 💰 Budget copies – often lack oleophobic coating and have low pixel density.

It is important to consider that even within a single batch of spare parts, there can be variations, because Xiaomi buys components from multiple partner plants, so having a small difference between the matrixes of different batches is normal for the industry.

Visual diagnosis and labelling

The original screens for the Redmi 4 Pro have a high pixel density, which makes the "grain" invisible even on close inspection. Turn on the white picture at maximum brightness: on a quality matrix should not be visible individual subpixels or uneven lighting at the edges.

Notice the connection plume. In the original parts, the markings are laser-marked or high-quality prints that don't erase with your finger, MI_4PRO_IPS_V1. If the inscription is lubricated or made with cheap paint, this is a sure sign of counterfeiting.

Also check the thickness of the frame around the matrix. In the original modules, it's uniform throughout the perimeter. In cheap copies, there's often asymmetry: the frame is wider at the bottom and narrower at the top, or vice versa.

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Use a magnifier or a macro shot on your phone to see the pixel structure. IPS-on the screen, subpixels are arranged in an orderly manner, without "porridge" and blurred boundaries.

And you pay special attention to the touchscreen. The original glass has a high-quality oleophobic coating, and a drop of water on it is collected into a perfect ball and easily rolled down. On the fake, the water spreads out, leaving traces, and it affects the tactile sensation and the speed of the sensor response.

Technical differences and supplier codes

Deep diagnostics requires connecting the screen to the board and analyzing the output information. Different vendors use different display controllers. Xiaomi Redmi 4 Pro is characterized by matrixes from manufacturers like Tianma, BOE or Innolux. You can find out the exact manufacturer through an engineering menu or special applications.

Run a feature-checking app, like Device Info HW or AIDA64. In the Display or Screen section, look for the Vendor or Panel Name field. It will show the code that can identify the origin of the part. For example, codes starting with TM often point to Tianma.

The differences can also be in refresh and response rates. Original panels are strictly 60Hz specifications. Cheap analogues can have unstable frame rates, which leads to microfluctuations when scrolling through the feed in the browser or social networks, which is especially noticeable when text is quickly scrolled.

The table below shows the main differences between the types of matrices found in the market:

Software methods of screening

Beyond visual inspection, there are software ways to distinguish the original from the fake. Android collects hardware logs, and in some cases, the type of matrix is written in the system files. These may require obtaining Root rights, but often standard tools are sufficient.

Use the ADB (Android Debug Bridge) utility to connect your smartphone to your computer.

adb shell dumpsys SurfaceFlinger

It's also worth checking the automatic brightness control, the original light sensors work smoothly, and copies often have "step-by-step" adjustments, where brightness changes in jerks when lighting changes, due to the use of cheap sensors and poor calibration.

⚠️ Note: If after replacing the screen, the proximity sensor or autobrightness stopped working, it is possible that the plume of the new part does not have the necessary contacts or the firmware incorrectly interacts with the new controller.

Another method is to check for the touchscreen dead zones. In the engineering menu (#6484##), select the Touch test. Run your finger through all parts of the screen. The line should be continuous and follow your finger accurately. Line breaks indicate defects in the digitizer.

Problems of the cords compatibility

One of the most common problems with replacement is physical incompatibility. The Redmi 4 Pro's screen plume has a specific shape and location of contacts. Even millimeter deviation in width or length of the plume can make installation impossible without "crutches."

There are often situations where the connector does not fully enter the socket of the board. Under no circumstances do not put excessive effort. This can lead to a break in the connector on the motherboard, which will require expensive micro soldering. It is better to immediately make sure that the geometry of the plume matches the original.

And you can see the safety stickers on the plume, and they often contain the original parts. QR-These stickers are either missing on cheap copies or contain repetitive, fake codes. Although this does not always affect work, it is a marker of quality control in the factory.

If the plume is too long, it can't be folded in accordion or bend at a sharp angle, which violates the integrity of the current tracks. In the original assemblies, the plume is designed to be within a millimeter for perfect stacking inside the housing.

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Physical compatibility of the plume is more important than software, and if the connector doesn't get up exactly the first time, the part is likely to fail or be defective.

How to distinguish a restored screen (Refurbished)

There's a category of products on the market called "restored" or Refurbished, which are original matrices that have broken glass but replaced it with a new one in the factory, and it's difficult to distinguish them from the new originals, but it's possible.

Carefully inspect the end of the module. The glass and matrix glue should not show any traces of glue, air bubbles or dust. Restored screens often have a subtle step-by-step transition between the glass and the frame. The original is always monolithic.

Also check for factory film. New original modules often come with a protective film that prints the Xiaomi logo or warnings. Refurbished screens may be missing or curved, with bubbles.

Color reproduction is another indicator: when reconstructing, UV glue is often used, which can turn yellow or change shade over time. If the new screen has a slight yellowish or pinkish hue on a white background, this may indicate the use of poor-quality optical adhesive in regulation.

⚠️ Warning: When buying a bezel-free screen, make sure that the old glue is completely removed from the case. Remains of the old glue can create a skew, and the new glass will burst at the first press.

Frequent mistakes in the selection of spare parts

Many users make the mistake of choosing a screen solely for the price. The cheap screen for the Redmi 4 Pro is a lottery with a low chance of success. The savings of 20-30% often translates into a loss of image quality and the need to be replaced again after a month.

Another mistake is ignoring reviews about a particular seller, even original parts can be stored incorrectly (for example, in the cold or in the direct sun), which spoils the matrix.

You don't have to rely on just a picture of the product. You can have stock photos and not reflect the real look of the part. You can ask the seller to have a real photo of the plume and markings before you send them, and that will help you avoid surprises when you receive them.

Remember that a good screen replacement brings your smartphone back to life and keeps your nerves safe. Careful selection and diagnosis are key to a successful repair.

FAQ: Frequently Asked Questions