Fixing Screen Lines on the Redmi K50 Ultra – A Universal Screen Replacement Guide

If you're seeing mysterious lines appear on your Redmi K50 Ultra screen—first one, then two, then suddenly a whole web of them—you're not alone. This issue is surprisingly common on this model, especially as it hits the 2- to 3-year mark. Whether it’s planned obsolescence or just normal wear and tear, a failing display doesn't mean you have to toss the whole phone.

In this guide, we’ll walk you through a full screen replacement on the Redmi K50 Ultra—and the best part? This step-by-step repair method works for almost all modern Android phones, including devices from Xiaomi, Redmi, OPPO, vivo, Motorola, Nokia, Huawei, Honor, and more.

The Problem: Gradual Screen Failure

The Redmi K50 Ultra was a performance beast when it launched, packing the Snapdragon 8+ Gen 1 and retailing for half the price of other flagships. But now, a few years later, many users are reporting vertical lines, flickering, and touch issues—classic signs of a dying display.

Instead of shelling out for a new device, you can restore your phone by replacing the screen yourself.

What You’ll Need

• Replacement screen for your model

• Magic self-heating pad (or a heat gun/hairdryer)

• Pry tools and plastic opening cards

• Isopropyl alcohol (90% or higher)

• B7000 adhesive

• Tesa double-sided tape (recommended for ultra-thin bezels)

• Screwdriver set

• Patience and care 😄

🔧 Note: This process is not just for the Redmi K50 Ultra. Most Android phones from the brands mentioned above use similar assembly: a glued back cover, bottom speaker module, and display connectors underneath. The structure may vary slightly, but the method is essentially the same.

Step-by-Step Guide: Replacing the Screen

1. Power Off and Heat the Back Cover

Turn off the device. If the touch still works, shut it down via the screen.
Apply the heating pad for about 10 minutes. Gently insert a pry tool to create a gap. Drip in some alcohol to soften the adhesive and work your way around with a plastic card.

2. Disconnect the Battery

Once the back is off, remove the screws on the top cover and disconnect the battery first. This is crucial for safety.

3. Remove the Speaker Module

Take out the screws holding the bottom speaker and remove it to access the screen connector.

4. Test the New Screen

Before installing, connect the new screen and the battery, and power on the phone. Check for:

• Dead pixels

• Touch response in all corners

• Any lingering display lines

If all is good, shut it down again.

5. Remove the Broken Screen

Flip the phone over, heat the front, and repeat the same prying process to lift the screen. Be careful of cables and sensors.

6. Clean the Frame

Remove all old glue and broken glass. This step is important—leftover debris can damage the new display or prevent proper bonding.

7. Apply Adhesive

Use B7000 glue sparingly and evenly around the frame. Avoid the sensor areas and flex cable paths. Add a full loop of Tesa double-sided tape to ensure a strong, factory-level bond—especially important for narrow bezel screens.

8. Install and Seal

Thread the new screen cable through the frame. Align and press the screen into place. Reconnect everything, test again, and then screw everything back together.

9. Final Touch

Add a bit of glue if needed around the back cover and seal it up. Done!

Final Thoughts

Doing your own screen replacement not only saves you money but also extends the life of your phone—helping reduce e-waste and fight back against planned obsolescence. Once you’ve done this once, you’ll realise how similar many Android phones are under the hood.

If you're a tech enthusiast, DIY repairer, or even just someone who doesn’t want to throw away a perfectly good phone because of a screen issue, this video guide can be your go-to reference.

📺 Watch the full video tutorial here: [YouTube link]
🛠️ Need tools or parts?

Xiaomi Mi 12T / 12T Pro / Redmi K50 Ultra AMOLED Display Touch Digitizer Glass LCD Screen Assembly:https://www.polartech.com.au/products/xiaomi-mi-12t-12t-pro-redmi-k50-ultra-amoled-display-touch-digitizer-glass-lcd-screen-assembly

100M Long Tesa 61935 Black Double Sde Strong Adhesive Tape for Mobile Phone Repair:https://www.polartech.com.au/products/100m-long-tesa-61935-black-double-sde-strong-adhesive-tape-for-mobile-phone-repair

Got questions or want us to show other phone models? Drop a comment under the video—we’d love to help!