Why do lines appear on my Samsung Galaxy S25 phone?

Publicado por Maria

Why are there lines on my Samsung Galaxy S25 phone?

You wake up one day, grab your precious Samsung Galaxy S25, and there it is. A vertical line, perhaps green or pink, or a tangle of horizontal lines that weren?t there before. It?s one of those situations that makes your heart sink, especially with such an advanced device. But don?t worry, take a deep breath. At iLevante.com, we not only offer you the best replacement parts for your phone, but we also provide the information you need to understand what?s happening and how you can fix it.

In this article, we?re going to dive into the heart of your Galaxy S25 to discover why these annoying lines appear and what you can do to make your screen look like new again. Let?s get started! ?

The main causes of the problem

Although it may seem like a catastrophic failure, the appearance of lines on the screen is usually due to a limited number of causes, almost always related to hardware. Forget about viruses or malicious apps; the problem is usually physical. Here we explain the most common reasons.

The most common culprit: Damage to the OLED panel

Complete Screen Samsung S25 is a masterpiece of engineering, composed of millions of organic pixels (OLED) that light up independently. This technology allows for those pure blacks and vibrant colors you love, but it?s also delicate.

• Impacts and drops: This is the number one cause. Even if you don?t see a crack in the outer glass, a drop or a strong impact can damage the extremely thin internal layers of the OLED panel. An impact on a corner may be enough for a row of pixels to stop working correctly, creating a vertical line of a fixed color (green and pink are the most common).
• Excessive pressure: Do you usually carry your phone in your back pocket? Sitting on it or carrying it in a very tight backpack can exert uneven pressure on the screen. This torsion, even if slight, can damage the internal connections of the panel and cause lines to appear.

In these cases, the only real solution is to replace the entire screen assembly. The damaged OLED panel cannot be "repaired" at the pixel level; it?s a single piece that must be replaced.

A bad connection: The flex cable failure

Imagine a data highway between your phone?s motherboard (the brain) and the screen (the eyes). That highway is a component called flex cable. It?s a thin and flexible ribbon with multiple conductive tracks that transmits the image signal. If this "highway" gets damaged, data traffic is interrupted.

• Loose connection: Sometimes, an impact can cause the flex cable connector to slightly detach from its socket on the motherboard. If the connection isn?t perfect, the image signal arrives intermittently or corrupted, which can manifest as flickering or lines on the screen.
• Damaged cable: The flex cable itself can bend, pinch, or break during a drop or a poorly executed previous repair. A small tear in this cable is enough to cut communication with a section of the screen, generating lines.

Which part to replace? If the problem is just a loose connection, sometimes it?s enough to open the device and firmly reconnect the cable. However, it?s more common, especially in DIY repairs, for the flex cable to come integrated into the new screen assembly. Buying the complete screen ensures that both the panel and its main flex cable are new and working perfectly.

The source of the problem: Motherboard failures

This is the least common cause but not impossible. Sometimes, the problem isn?t in the screen or its cable but in the starting point: the motherboard (also known as PBA or Printed Board Assembly).

• Damaged connector on the motherboard: The socket on the motherboard where the screen?s flex cable plugs in can also be damaged by a pull or poor handling. If its pins break or come unsoldered, the connection will fail.
• Graphic chip (GPU) failure: In very rare cases, a failure in the graphics processor integrated into the phone?s main chip could generate artifacts or lines in the image.

These repairs are much more complex. Replacing a connector on the motherboard requires microsoldering tools and very advanced knowledge. If the GPU fails, the only solution is usually to replace the entire motherboard, a costly and complex repair. For the average user, if a motherboard failure is suspected, it?s best to visit a professional technical service.

Hands-on: Basic guide to replacing your Galaxy S25 screen

If you?ve concluded that you need to replace the screen and feel brave enough to do it yourself, great! It?s a delicate but very rewarding process. At iLevante.com, you?ll find the best quality screen assembly for your Samsung Galaxy S25.

Here?s a simplified guide to the steps you?ll follow.

Tools you?ll need ??

• Precision screwdriver kit: You?ll need a Phillips #00 tip or similar.
• Heat gun or hairdryer: To soften the adhesive on the back cover.
• Suction cup: To lift the back cover.
• Plastic picks or a thin card: To cut the adhesive. Never use metal!
• Precision tweezers: To handle connectors and small screws.
• New adhesive for the back cover or B-7000 glue: To seal the phone when finished.

Step by step (summary version)

1. Turn off the phone: The most important step! And if possible, discharge the battery below 25% for safety.
2. Heat the back cover: Apply heat evenly around the edges of the back cover for a couple of minutes. This will soften the glue that seals it.
3. Open the device: Place the suction cup near an edge and gently pull to create a small opening. Insert a plastic pick into that opening.
4. Cut the adhesive: Carefully slide the pick around the entire perimeter of the phone to separate the back cover from the chassis. Do this patiently to avoid breaking the cover.
5. Disconnect components: Once open, you?ll see several protective plates secured with screws. Remove them and, using a plastic tool, carefully disconnect the battery connector. Then locate and disconnect the old screen?s flex cable.
6. Remove the damaged screen: This step may vary. If your replacement comes with the metal frame included (highly recommended), you?ll need to transplant components such as the motherboard, battery, speakers, and vibration motors to the new frame. If the replacement is just the screen, you?ll need to apply more heat to the front to separate it from the original frame.
7. Install the new screen: Connect the new screen?s flex cable to the motherboard to test it works correctly before sealing everything. Turn on the phone and check that the image and touch functionality respond well.
8. Reassemble: If everything works, reconnect the battery and put all screws and protective plates back in place. Apply the new adhesive to the frame and seal the back cover, applying even pressure.

Be careful! Common mistakes when repairing your phone (and how to avoid them)

Repairing a modern phone is like surgery. One wrong move can cause problems. Here?s a list of common mistakes to keep in mind:

• Breaking the back cover: It?s made of glass and very fragile. The secret is to use enough heat and lots of patience. Never force the opening. If you feel resistance, apply a bit more heat.
• Damaging other flex cables: When opening the phone, you?ll encounter other flexible cables (for the volume buttons, charging port, NFC antennas...). Keep a mental map of where they are and be very careful not to tear them with tools.
• Not disconnecting the battery first: A very serious mistake! Handling connectors with the battery plugged in can cause a short circuit and irreversibly damage the motherboard. Always, always disconnect the battery first.
• Losing water resistance: Your Galaxy S25 comes factory-sealed with an IP68 certification. Opening it breaks that seal. Even if you use new adhesive, it?s very difficult to replicate the factory seal. Assume that after the repair, your phone will no longer be waterproof.
• Forgetting to transfer small components: When replacing the screen, especially if the replacement comes with a frame, make sure to transfer all the small parts from the old frame to the new one: the upper speaker mesh, microphone gaskets, etc.

We hope this guide has been very helpful. Facing lines on your screen can be daunting, but with the right information and quality replacement parts you?ll find at iLevante.com, you have the power to bring your Samsung Galaxy S25 back to life. Good luck with your repair! ?