Replacement of the display port (DP) Xiaomi: from diagnostics to firmware

Replacement of the Display Port (DisplayPort, DP) On Xiaomi smartphones, it's a procedure that you need to do when you're physically damaged, when you're corroding your contacts, when you're in a factory defect, and unlike replacing the screen itself, it's about repairing the interface between the motherboard and the display. This malfunction manifests itself as a black screen when the backlight is working, artifacts in the form of vertical stripes or flickering when the body is bent.

Replacement DP on Xiaomi devices (including the Redmi Note 12 series, POCO X5, Mi 13) requires not only soldering skills, but also an understanding of the board architecture. AMOLED-The port is often integrated into a flexible plume. FPC, then LCD-It can be a separate chip, but it's also important to consider that you might need to have firmware after you've replaced it. EDID — digital display identifier, without which the system will not recognize the new module.

In this article, we will discuss:

• 🔍 How to diagnose a malfunction DP (differentiation from damage to a plume or matrix)
• 🛠️ Required tools and choice of spare parts (original vs. analogues)
• 🔥 Step-by-step replacement process with photos and diagrams for popular models
• ⚡ Possible errors and how to avoid them (for example, backlight controller damage)
• 📱 Software setting after repair (color calibration, artifact test)

Diagnosis of malfunction DP: symptoms

Before you start replacing, make sure that the problem is in the display port, not in the plume, matrix or GPU.

• 📵 Black screen when turned on, but backlight works (visible in bright light).
• 🎨 Artifacts: vertical stripes, "snow", distorted colors - especially when pressing the body.
• 🔄 Flickering when bending the phone (symptom of "breaking" contacts DP).
• 🔋 The phone charges, vibrates, but the image is missing (excludes battery failure).

For accurate diagnosis, follow the following steps:

1. Connect the phone to PC through USB-C Check if the device is determined in ADB (If so, the motherboard is not the problem.
2. Light a flashlight on the screen: if you see weak outlines of the interface - faulty backlight controller, not a bad one. DP.
3. Check the display plume for microcracks (use a magnifying glass). If the plume is intact, the port is to blame.

On Xiaomi models with AMOLED (Like Redmi. K60 or Mi 13 Ultra) malfunction DP Often accompanied by constant overheating due to increased load on the GPU, which tries to “push” the signal through damaged contacts.

2. Selection of spare parts: original vs. analogues

When you buy a new display port for Xiaomi, you will come across three types of parts:

For Xiaomi models with AMOLED-displays (e.g., displays, POCO F5 Or the Redmi Note 12 Pro.+) It is recommended to buy a port in the assembly with a plume - this simplifies soldering work. LCD-Models (e.g. Redmi) 10C) DP It is often a separate chip. TI SN75DP129 or similar, which can be replaced separately.

Where to buy:

• 🛒 AliExpress is cheap, but long wait (look for sellers rated 98%+).
• 🏬 Local service centers are original parts, but expensive.
• 🔧 Repairmen's forums (e.g, 4PDA) — b/w details from donors.

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Before buying, check the port markings on your charge (for example, DP1507 or PTN3460). This will help to avoid errors when choosing an analogue.

3. Replacement tools DP Xiaomi

To replace the display port, you need specialized equipment.

• 🔥 Temperature controlled soldering station (optimally: Hako) FX-888D analogue).
• 🧲 Thermo-air station (for chip dismantling) BGA, port-soldier).
• 🔍 Microscope or magnifier ×10–×20 (for control of soldering works).
• 🛠️ Set of mediators and shoulder blades for disassembling the body.
• 🧴 Flus (e.g. Amtech) NC-559-ASM) and solder (tin-lead) Sn63Pb37).
• 📏 Cable lintels (to test the signal after replacement).

For models with AMOLED-The displays will need additional:

• 🔌 Firmware programmer EDID (for example, RT809H or CH341A).
• 💾 dump EDID for your model (can be found on forums or removed from your work device).

Critical: when working with a soldering station, set the temperature not above 350°C for chips DP 400°C for contact areas, the temperature will lead to the detachment of the tracks on the board.

Disconnect the battery (risk of short circuit)|Take down the damp EDID (if AMOLED)|Check for emergency contacts|Prepare an antistatic mat|Spread the screws on the containers (do not lose!)

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4. Step-by-step instructions for replacement DP

Let’s look at the Xiaomi Redmi Note 11 Pro.+ 5G (model AMOLED-display and integrated DP For other models, the steps are similar, but the details of the disassembly may differ.

Step 1: Disassembling the phone

1. Turn off the phone and remove the SIM- card.

2. heat the back cover with a hair dryer (temperature 80-90)°C) and put it in the mediator. Be careful, Xiaomi often uses adhesive compounds.

3. Unscrew the screws holding the metal plate over the battery (use a screwdriver). T3 or T4).

4. disconnect the battery plume, then remove the battery (use a plastic shoulder blade if necessary).

Step 2: Demolishing the Old DP

1. Find the display port on the motherboard (usually located next to the connector of the screen plume, marked as DP eDP).

2.Apply flux to the port contacts and heat them with a thermo-air station (temperature 300-320)°C).

3. gently tuck the port with the mediator, without touching the neighboring elements (especially PMIC — power-controller).

4. Clear the contact areas from the residues of solder with the help of overflow.

Step 3: Installation of a new DP

1. Check the new port for damage (especially contacts) LANE0–LANE3).

2. Apply fresh flux to the sites and set the port, combining with the tags on the board.

3. Warm up the port with a thermal air station (300)°C), evenly distributing heat.

4. Check the soldering quality under a microscope - there should be no jumpers between contacts.

Step 4: Firmware EDID (for AMOLED)

1. Connect the programmer to the contacts I2C on the board (usually next to the display connector).

2. Load the dump. EDID (a) a program (e.g., NeoProgrammer).

3. Write the data to the display memory chip (address usually) 0x50 or 0x51).

4.Reset the phone and check the screen.

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In the models with LCD-displays (e.g., Redmi) 9A) firmware EDID No need, but you may need to calibrate the color in the engineering menu (#36446337##).

5. Common Mistakes and How to Avoid Them

Even experienced repairmen face problems when replacing DP. Here are the most common:

• ⚡ Short circuits in soldering - due to overheating or sloppy handling of the solder. Solution: use an antistatic bracelet and check the resistance between the contacts with a multimeter.
• 🔄 Incompatibility EDID — After the replacement, the screen does not turn on or shows artifacts. Solution: run the original dump or use a universal one. EDID for your model.
• 📉 The drop in brightness - often occurs on AMOLED, If the backlight contacts are damaged, solution: check the backlight power circuit (LED+ and LED-).
• 🔌 Bad contact, the screen works, but when you press the case, you get artifacts. Solution: Re-drink the port with additional reinforcement of contacts.

The most critical mistake is damage. GPU or RAM On Xiaomi with Qualcomm Snapdragon processors (for example, POCO X4 Pro) Adreno GPU sensitive to temperatures above 380°C. If, after replacement, DP The phone doesn’t turn on at all – probably the memory chip has burned or GPU.

⚠️ Note: On Xiaomi models with Always-on Display (e.g. Mi 13) after replacement DP You may need to reset your settings via Fastboot (fastboot erase config command). Otherwise, the screen will flicker in standby mode.

6. Testing and adjustment after replacement

After replacement DP You need to check the screen and calibrate it if you need to:

1. Visual test: Turn on your phone and check for no artifacts, broken pixels, uneven backlights.
2. Sensor Test: Use the Touch Screen Test app to check the response to touches across the entire screen area.
3. Color rendering check: run test pictures (gradients, gray scales) in the Display Tester app.
4. Twinkle Test: From the Engineering Menu (#284###) select Display Test → Flicker Test.
5. Auto Brightness check: turn on automatic brightness adjustment and point a flashlight at the light sensor.

If you find problems with color reproduction (for example, the prevalence of green), calibrate in the engineering menu:

1. Enter the code ##36446337##.
2. Go to Display. → Color Calibration.
3. Select an sRGB profile or DCIP3 (for AMOLED).
4. Save the settings and restart the device.

In the models with MIUI 14+ post-replacement DP Device Health Services may be able to use the protection to block the screen due to an "unoriginal detail" to remove the lock:

1. Connect your phone to your PC and start the ADB.
2. Enter the command: adb shell settings put global oem_unlock_allowed 1
3. Reset the device.

7. Cost of repair in the service vs. self-replacement

Replacement price DP The following is a comparison table for popular Xiaomi devices (Moscow, 2026):

Self-repairing is cheaper, but requires:

• 🛠️ Microelectronics skills (especially for BGA-chip).
• 🔧 Access to programmer for AMOLED-display.
• ⏱️ Time for diagnosis and testing (3-5 hours for beginners).

When is the best time to contact the service:

• If your model is equipped LTPO-display (e.g. Xiaomi) 13T) — High probability of damage to the board when self-replacement.
• If after soldering there were problems with the sensor or camera - this indicates damage to neighboring components.
• If you are not sure about your skills with BGA-chip.

⚠️ Note: On devices with the function Xiaomi HyperCharge (fast charging) 120W+) post-replacement DP Protection against non-original spare parts can work, limiting the charging power to 18W. To remove the restriction, firmware is required. PMIC via Qualcomm Firehose.

8. Alternative solutions: if the replacement DP impossible

In some cases, replacing the display port is not technically feasible, such as if the motherboard itself is damaged or the cost of repair exceeds the price of the phone.

• 🔄 Using an external display through USB-C → HDMI. Xiaomi with DisplayPort Alt Mode support, for example, POCO F4 GT) You can plug in a monitor and use your phone as a mini PC. You need a Realtek chip adapter. RTD2173.
• 📱 Replacement of the entire motherboard. Relevant for flagships (for example, Mi 13 Pro), where the cost of the fee (~15 000 rubles) below the price of a new phone.
• 🔧 Contact repairs DP. If the port is not completely damaged, but only oxidized contacts, they can be cleaned with alcohol and restored with soldering.
• 💰 Trade-in. Many salons (for example, the Messenger or MTS) accept phones with a broken screen under the exchange program at a discount on the new model.

To connect an external display on Xiaomi, follow the following steps:

1. Connect the USB-C → HDMI adapter to your phone.
2. Enable Desktop Mode in Settings (Settings) → Display. → Desktop mode).
3. Set the resolution of the external screen (optimally: 1920×1080 upon 60 Hz).

Limitations:

• On models with MediaTek (for example, Redmi Note 11) may not work sound through the HDMI.
• In Desktop Mode, some applications (such as games) may not run.

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If you choose to replace the motherboard, be sure to move the chip. NAND (Memory from the old board, otherwise you will lose all data (including the linking of the Mi Account).

FAQ: Frequent questions about replacement DP Xiaomi