How to fix Android TV box that keeps flashing on and off?

Welcome to Blackview (Which offers rugged phone with projector, and tablet with projector, and more) blog. Hope the guide helps.

When an Android TV box keeps flashing on and off, it can be frustrating and confusing. This issue often looks like a power failure, but in reality it can be caused by several different factors, including unstable power supply, faulty firmware, overheating, or even a damaged HDMI connection. Understanding the root cause is essential because simply restarting the device may not solve the problem permanently.

• Read also: How to fix Android TV box wifi keeps turning off?
• How to fix Android TV box keeps restarting?

Many users assume the device is completely broken when it enters a boot loop or keeps blinking, but in most cases the problem is fixable at home without professional repair. By following a systematic troubleshooting process—checking power, connections, software, and hardware—you can usually restore your Android TV box to normal operation and prevent the issue from happening again.

Check the Power Supply

The most common reason an Android TV box flashes on and off is an unstable or insufficient power source. These devices require a specific voltage and amperage, and using the wrong adapter can cause repeated restarts or blinking indicator lights.

Use the Original Adapter

Always start by using the original power adapter that came with the TV box. Third-party chargers may not provide consistent current, which leads to boot loops. If the original adapter is damaged, replace it with one that has exactly the same voltage and equal or higher amperage.

Test a Different Power Outlet

Plug the device into a different wall outlet or a surge protector. A loose socket or unstable electrical supply can cause the box to power cycle repeatedly. Avoid using overloaded power strips, as they may not deliver steady power.

Inspect HDMI and External Connections

Sometimes the flashing behavior is not a power issue but a signal problem between the TV box and the television. A faulty HDMI cable or loose connection can trigger repeated screen blinking that looks like the box is turning on and off.

Reconnect the HDMI Cable

Unplug the HDMI cable from both the TV and the Android box, then reconnect it firmly. Try a different HDMI port on the television. If possible, test with another HDMI cable to rule out cable damage.

Disconnect External Devices

Remove USB drives, game controllers, keyboards, and other accessories. A malfunctioning peripheral can draw too much power or interfere with the boot process, causing the device to restart continuously.

Check for Overheating

Overheating is another frequent cause of flashing or automatic restarts. Android TV boxes are compact and can accumulate heat quickly, especially if placed in enclosed spaces.

Improve Ventilation

Make sure the box is placed in an open area with proper airflow. Do not stack other electronics on top of it. Dust buildup in ventilation holes can trap heat, so gently clean the device with compressed air if necessary.

Allow the Device to Cool Down

If the box feels hot to the touch, unplug it and let it cool for at least 15–20 minutes before turning it back on. Persistent overheating may indicate internal hardware failure or a worn-out thermal component.

Fix Software or Firmware Issues

If the hardware and power supply are working correctly, the flashing may be caused by corrupted system files or a failed update. This often results in a boot loop where the logo appears and disappears repeatedly.

Perform a Soft Reset

Unplug the power cable, wait about one minute, then plug it back in. This clears temporary memory and can resolve minor software glitches without deleting your data.

Factory Reset the Device

If the problem persists, perform a factory reset using the recovery mode. This usually involves holding the reset button (often inside the AV port) while reconnecting the power. A factory reset will erase installed apps and settings but can fix corrupted firmware.

Reinstall the Firmware

For severe boot loop issues, reinstalling the official firmware using a USB drive or flashing tool may be necessary. Make sure to download firmware specifically designed for your exact model to avoid permanent damage.

Consider Hardware Failure

If none of the previous solutions work, the issue may be caused by faulty internal components such as the power management chip, eMMC storage, or motherboard. In such cases, the device may continue flashing even with correct power and fresh firmware.

Signs of Internal Damage

Common indicators include a burning smell, visible physical damage, or the device failing to power on at all after repeated flashing. These symptoms usually require professional repair or replacement.

Fixing an Android TV box that keeps flashing on and off involves a step-by-step approach: verify the power supply, check HDMI connections, ensure proper cooling, and address software corruption. Most issues are caused by simple factors like a faulty adapter or overheating, which can be resolved quickly without technical expertise.

If the problem continues after trying all troubleshooting methods, replacing the device may be more cost-effective than repairing internal hardware. By using the correct power accessories, keeping the box well-ventilated, and avoiding unsafe firmware updates, you can prevent future flashing problems and enjoy a stable Android TV experience.