Replacement of the display on Xiaomi Redmi 4 Pro: a guide for the master

When a favorite smartphone is broken, it’s always a mess, especially when it comes to the Xiaomi Redmi 4 Pro (also known as the Redmi 4 Prime), which is famous for its metal body and excellent autonomy, but the glass on the front remains a vulnerable element. Falling on asphalt or hitting a hard object often leads to a “web” of cracks or a complete failure of the touchscreen. Many users immediately run to the service center, unaware that self-replacement module is quite real with accuracy and a minimum set of tools.

Before you start taking action, you need to clearly understand what you will change. In modern smartphones, including the Redmi 4 Pro, the display and glass (touchscreen) are most often soldered into a single node - the so-called ekranoplan or module with a frame. Changing glass separately at home is almost impossible without specialized equipment for separation and lamination. So in this manual we will consider the process of replacing the whole module, which is the most reliable and quickest way to restore the device to work.

It's important to assess the scale of the disaster immediately. If only the glass is broken and the image is clean and the sensor is responsive, you can theoretically try to glue the glass, but the risk of damage to the matrix is more than 80%. If you see black spots, stripes or a sensor does not work, you need to replace the module. The cost of a new display for this model is relatively low, which makes it economically feasible to repair yourself. In the process, you will need patience, because the metal frame of the case requires careful handling of screws and plumes.

Preparation of the workplace and selection of components

The quality of the repair depends on the spare part you purchased. The market is full of copies of different quality, and for the Xiaomi Redmi 4 Pro this is especially true. The original IPS matrix has excellent color reproduction and brightness margin, while cheap counterparts can suffer from low sensor sensitivity and color distortion.

The second critical step is to have a clean, well-lit desk, preferably with a light surface, so that you don't lose small screws. Light should fall evenly without creating glare that prevents you from seeing small details. Also, prepare a magnetic substrate or a piece of paper with a drawn diagram where you'll spread the screws in order of extraction. This will help avoid confusion, as the fasteners in the Redmi 4 Pro can have different lengths and threads.

And there's no need to ignore the safety issue. The lithium polymer battery in your smartphone is sensitive to puncture and heat. Any damage to the battery shell can cause fire or bloating. So all metal tools in the vicinity of the battery should be handled with extreme caution. If you see that the battery is already bloated, it's best to replace it at the same time as the screen, so as not to disassemble the phone twice.

Required tools for disassembly

To successfully replace the display on the Xiaomi Redmi 4 Pro, you will need a specific but affordable set of tools. The standard household screwdriver set will not work here, since the screws in Xiaomi smartphones have a special hat. The main tool is the PH000 or PH00 screwdriver. Using a too large screwdriver will lead to the slicing of the screw faces, after which it will be extremely difficult to unscrew it without drilling.

The second important element is plastic tools to open the case, and it is strictly forbidden to use metal blades or knives, because they can damage the plumes, break the battery or scratch the aluminum frame.

• 🛠️ Plastic blade (poodger) for snapping the latches of the shell.
• 📱 Plastic mediator or thin card for detaching modules.
• 🧲 Magnetic mat or organizer for screws.
• 🔥 A hair dryer or thermophen for softening the glue (if the module is without a frame).
• 🧪 Isopropyl alcohol or special solvent B-7000.

⚠️ Warning: Do not use a hair dryer instead of a building one. A normal hair dryer does not develop enough temperature to soften the factory glue, and a building hair dryer should be kept at least 10 cm away from the body so as not to melt the plastic elements inside.

Also, don't forget the suction cup. It's necessary to create the initial gap between the display and the frame. If there's no suction cup, you can use a thin line or string, but that requires some skill. To clean the contacts and remove the residues of old glue, isopropyl alcohol is ideal, which does not conduct current and quickly evaporates without leaving traces.

The process of dismantling the old module

Start disassembling Xiaomi Redmi 4 Pro with the device turned off. This is a prerequisite, since turning off the train under voltage can disable the power controller or the motherboard itself. SIM-And you can flip your smartphone up with the back cover, and on the bottom side, you'll see two screws holding the bottom plastic cap. PH000.

When you remove the bottom cover, you get access to the main board. It's important to take your time. First, you need to turn off the plumes. Use the plastic blade to gently lift the connector locks. Don't pull the plumes themselves -- just the hard parts of the connectors. Once you turn off all the plumes (display, touchscreen, lower board plume), you can move on to twisting the screws that hold the metal screen of the board and the board itself.

After removing the motherboard and battery (which is glued to double-sided tape in this model), access to the bottom of the case, where the display plume is located. The screen module in Redmi 4 Pro is glued along the perimeter of the metal frame. To remove it, the body must be warmed up. Warm up the front part evenly with a hairdryer for 2-3 minutes. Then, inserting the suction cup into the bottom of the screen, pull up, creating tension, and simultaneously swipe a plastic card or blade along the perimeter, cutting the glue.

Installation of a new display and assembly

Before you install the new module, be sure to test it on weight. Connect the new screen plumes to the motherboard and turn on the smartphone. Check the matrix for broken pixels, uniformity of the backlight and, most importantly, the operation of the touchscreen. Swipe your finger across the surface, open the dial and check the response. If everything works correctly, turn off the phone and disconnect the plumes.

Now you need to prepare the frame of the new module or clean the old one. If you bought a module with a frame (which is recommended for the Xiaomi Redmi 4 Pro), the process is simplified. You only need to move the necessary elements from the old module (if they do not come with a package), such as a dynamic speaker or vibrator, although new modules often already have them. Apply a thin layer of B-7000 glue or use a pre-installed double-sided tape around the frame perimeter.

Carefully put the module into the case, making sure that the plume passes freely through the hole allocated for it and does not squeeze. Connect the connectors to the motherboard before a characteristic click. Set the board in place, twist all the screws. Before the final twist of the screws of the case, check the sensor again, without collecting the phone completely. If everything works, you can finally fix the board and close the bottom cover.

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After installing a new display on Xiaomi Redmi 4 Pro is recommended to allow the glue to be fully polymerized during 1-2 hours before inserting SIM-This will ensure that you have a tight seal and no gaps.

Common Errors and How to Resolve Them

When replacing the display with the Xiaomi Redmi 4 Pro, beginners often make a number of characteristic mistakes. One of the most common is the damage to the plume when inserting the module. The plume is very thin and gentle, it is easy to tear against the edge of the metal frame. To avoid this, use tweezers to accurately position the plume and never apply excessive force.

Another problem is the touchscreen dead zones after assembly, and it can be caused by two reasons: either you didn't press the connector well (it didn't come in until the end), or you used a substandard adhesive compound that squeezed under the matrix and created pressure. In the first case, it's enough to reconnect the plume. In the second case, you need to disassemble and remove the glue surplus.

• 🚫 Mistake: Using superglue (cyanacrylate) It releases vapors that settle on the camera lens and matrix, forming a white plaque, and also makes re-repair impossible.
• 🚫 Mistake: Ignoring calibration. After the touchscreen is replaced, it may be necessary to calibrate through the engineering menu.
• 🚫 Mistake: screws tightening. Aluminum case is easy to deform, and metal bushings are easy to tear.

⚠️ Note: If after changing the screen, the smartphone stopped seeing SIM-If you have a card or a sound gone, check to see if you have damaged the plumes of the lower boards when you disassemble them. In the Redmi 4 Pro, they are connected by an additional plume that is easy to break when you sloppyly remove them.

Calibration and quality control

The final step is software setup and verification. The Xiaomi Redmi 4 Pro is characterized by good factory calibration, but after replacing the touchscreen, you can see a desynchronization. To check and adjust, use the built-in engineering menu. To get into it, type in the code # # #64663##. In the open menu, select the item associated with the touch screen (usually Touchpanel), and follow the instructions on the screen, drawing lines and checking multi-touch.

Notice the uniformity of the backlight. Turn on the white image at maximum brightness and examine the screen when the light is off. The presence of yellow spots or uneven illumination at the edges may indicate a matrix defect or improper installation (for example, skewed when pasting). Also check the proximity sensor. When you bring the phone to the ear during ringing, the screen should go out. If this does not happen, it may be contaminated or glue blocked.

Checking the capacitive layer should not only be done with your fingers, but also with charging enabled. Cheap copies of displays often lose sensitivity when connecting the charger due to poor shielding. If the cursor starts to "walk" on its own when charging, this is a sign of poor copy quality or grounding problems in your home.

Frequently Asked Questions (FAQ)

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Independent replacement of the display on Xiaomi Redmi 4 Pro allows you to save up to 70% of the cost of repair in the service, but requires accuracy, quality components and strict adherence to the sequence of actions.