Repairing Samssung A20, A20s with Black Screen Issue and Backlight Failure

Phuc Mobile 9 Empty

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Repairing Samssung A20, A20s  with Black Screen Issue and Backlight Failure

Causes of a Black Screen While the Phone Still Vibrates When Plugged In

First, let's summarize the issue: The phone still vibrates or makes sound when plugged in, and incoming calls ring, but the screen remains black. Below are the potential causes and solutions:

1. Loose Screen Cable Due to a Drop

Signs: If the phone has been dropped, the screen cable might have become loose, leading to a black screen without visible cracks.
Solution: Open the device and reseat the screen cable.

2. Damaged Screen

Signs: The screen remains black, touchscreen malfunctions, occasional flickering, partial illumination, or random touch responses.
Causes: Water damage, physical impact, pressure on the screen, or burnt IC components.
Solution: Replace the screen.

3. Display Circuit Issue (Mainboard Hardware Problem)

Causes: Internal components might have burned out due to physical damage or long-term wear.
Solution: Diagnose the circuit pathways, check for broken connections, and replace faulty components. This requires a skilled technician and costs start at 300,000 VND.

4. Faulty Display Cable Connecting the Screen to the Mainboard

Each phone model has a specific display cable that connects the screen to the mainboard.
Solution: Replacing the display cable costs between 150,000 VND and 250,000 VND.

5. Sub-board Failure

Some phones have a sub-board that connects the charging port and display cable. If this board fails, the screen may also stop functioning.
Solution: Replace or repair the sub-board.

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How to Fix a Phone That Won’t Turn On or Has a Black Screen

1. Check the Battery and Charge the Phone

• Plug in the charger and wait 10-15 minutes to see if the phone responds.

• Try using a different charger to rule out charger failure.

2. Force Restart Using Hardware Buttons

• For Android: Press and hold the Power button for 10-15 seconds.

• For iPhone:

  • Quickly press and release the Volume Up button.

  • Quickly press and release the Volume Down button.

  • Hold the Power button (or Power + Volume Down on older iPhones) until the Apple logo appears.

3. Check the Screen

Try calling your phone to see if it rings. If it vibrates or rings but the screen stays black, the display might be faulty.

4. Connect to a Computer

• Plug the phone into a computer to check if it's recognized.

• If the computer detects the phone but the screen remains black, the issue might be with the screen or display IC.

5. Factory Reset (Only for Software Issues)

If the issue is software-related, reset the phone via Recovery Mode (Note: This will erase all data).

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When to Take Your Phone to a Repair Center

If none of the above methods work, consider seeking professional repair services, especially if:

• The phone was dropped or suffered strong impact before the issue started.

• The phone was exposed to water.

• It overheats abnormally or emits a burnt smell.

• The battery was replaced, but the screen still doesn’t turn on.

Get Your Phone Fixed Today!

Don’t let a black screen disrupt your work and entertainment. Let our expert technicians help you restore your phone today!