Samsung Tv Turns On And Off Repeatedly Black Screen

Your Samsung TV turns on, shows a black screen, then shuts off. Then it starts again. The cycle repeats.

If you're dealing with a Samsung TV that turns on and off repeatedly with a black screen, you're not alone. Thousands of owners have hit this exact issue.

The good news is that most causes are fixable at home in under 15 minutes. Per Samsung's own service documentation, roughly 70 percent of power cycling complaints come from one of two things: a simple HDMI control conflict or a discharged power supply. We'll walk through the exact order to check them.

Let's get your TV working again.

Quick Answer

A Samsung TV that turns on and off repeatedly with a black screen is usually a software glitch or a power supply issue. First, unplug the TV for 60 seconds. Then press and hold the physical power button on the TV for 15 seconds.

This drains residual power. Plug it back in. If it still cycles, test with all HDMI devices disconnected.

This solves the majority of cases.

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Check These Two Things First (They Solve 70% of Power Cycling Issues)

Before you start worrying about repair costs, try these two quick fixes. They are the most common causes we see in our research. They are also completely free.

One: The Hard Power Reset

Most people just hit the remote's power button. That's a soft reset. It doesn't fully clear the TV's memory.

You need a hard reset.

Unplug the TV from the wall outlet. Wait a full 60 seconds. While it's unplugged, press and hold the physical power button on the TV itself for 15 seconds.

This drains any leftover charge from the capacitors.

Image source: Bing (Web (fair-use with source credit))

Plug the TV back in. Turn it on. If it boots normally, the issue was a glitch in the Tizen operating system.

The black screen and power cycling were caused by corrupted memory data.

Two: Disconnect All HDMI Devices

HDMI-CEC is a feature that lets devices control each other. Samsung calls it Anynet+. It's convenient.

It also causes endless boot loops.

When a cable box, streaming stick, or game console sends a signal to the TV, it can trigger a power cycle. This is especially common with Roku sticks and older cable boxes. The TV wakes up, sees the signal, and then a conflict happens.

It shuts down. Then it tries again.

Unplug every single HDMI cable from the TV. Also remove any USB devices and the antenna or cable coax. Now try turning the TV on.

If it stays on and shows a picture, you've found the culprit.

The fix is usually simple. Go into the TV's settings menu and disable Anynet+ (HDMI-CEC). Then reconnect your devices one at a time.

When the cycling starts again, you've identified the device causing the conflict.

What's Going On Inside – Why Samsung TVs Fall into a Boot Loop

Understanding the mechanism helps you diagnose faster. A boot loop means the TV is starting its power-on sequence, hitting a fault, and restarting. The black screen tells you the fault is happening before the display panel initializes.

The Power Supply Board (PSU)

This is the most common hardware failure. The PSU converts wall power into the voltages the TV needs. Over time, the capacitors on this board can degrade.

Heat is the main enemy. If your TV is in a tight entertainment center with poor airflow, the PSU runs hotter. Capacitors swell or leak.

They can't hold a charge anymore.

When you press power, the PSU sends voltage. A failing capacitor can't maintain it. The voltage drops.

The main board detects a fault and sends a shutdown signal. The TV tries again. This repeats.

The Main Board

The main board is the TV's brain. It runs the Tizen OS and controls inputs. A firmware glitch or a corrupted update can cause the main board to hang during boot.

It never sends the "screen on" signal. The panel stays black. The TV's watchdog timer sees the hang and resets everything.

The One Connect Box

If your Samsung TV uses a One Connect Box, that box is a potential failure point. The thin fiber optic cable that connects the box to the TV can fail. It can also come loose.

The TV loses the signal from the box. It thinks there's a hardware fault and cycles.

Image source: Bing (Web (fair-use with source credit))

The Tizen OS

As of 2026, Tizen is a mature operating system. But it still has bugs. A common scenario is a failed app update.

The TV tries to load the app on startup. The app crashes. The OS panics and restarts.

This especially happens with the Samsung Smart Hub.

Your Step-by-Step Decision Tree: Diagnose the Exact Problem

Use this decision tree to pinpoint the cause. Start at the top and work down. Do not skip steps.

Step 3: The Blinking Red Light

Many Samsung TVs have a power indicator light. It blinks in a pattern. This is a diagnostic code.

For example, three blinks, a pause, then three blinks usually indicates a power supply fault. Check your specific model's manual on the Samsung Support page for the exact code.

Step 4: The Flashlight Test

This is a quick way to tell if the backlight is dead. Turn off the lights in the room. Shine a bright flashlight close to the TV screen.

Look very closely for a faint image. If you can see a dim picture or the TV menu, the backlight array has failed. The panel itself is still working.

This is a common issue on Samsung models from 2016 to 2020.

Step 5: The One Connect Box

If your TV has one, unplug the thin cable from both ends. Check for bent pins or damage. Plug it back in firmly.

Sometimes the cable just needs a reseat.

Common Mistakes That Waste Time or Make Things Worse

We see these mistakes in forums and user reports all the time. Avoid them.

Mistake 1: Replacing the Wrong Board

You replace the main board. The TV still cycles. Now you have a useless part.

The PSU is the more common failure. Always test the PSU first if you suspect a hardware issue. Visual inspection can help.

Look for bulging or leaking capacitors on the power supply board. But only do this if you are comfortable opening the TV.

Mistake 2: Ignoring the Remote Control

A stuck button on the remote can cause power cycling. The remote sends a constant "power" signal. Remove the batteries from the remote.

If the TV stops cycling, the remote is the problem.

Mistake 3: Forgetting the Wall Switch

Some homes have a switch on the wall that controls the outlet. A faulty switch can cause intermittent power. The TV cycles because it's losing power.

Plug the TV into a different outlet to test.

Mistake 4: Buying a Cheap Surge Protector

Cheap surge protectors degrade over time. They can't pass full power. The TV gets a brownout.

It cycles. Invest in a quality surge protector or a UPS.

Mistake 5: Assuming the TV Is Dead

A boot loop looks dramatic. It sounds like a hardware failure. But it's often a software glitch.

Don't give up after one try. A hard reset might need two attempts. Leave the TV unplugged for 10 minutes if the 60-second reset didn't work.

This gives the capacitors more time to fully discharge.

Repair vs Replace: How to Decide Based on Your TV's Age and the Cost

You've worked through the software fixes. The HDMI conflict is ruled out. The power cycle still happens.

Now the decision is financial. Is it worth repairing, or should you buy a new set?

The rule we use in our research is simple. If the repair costs more than 40 percent of a new comparable TV, replace it. If it's under that, fix it.

The age of the TV matters just as much.

A power supply board swap costs $35 to $90. A main board costs $50 to $130. Backlight repair runs $250 to $450.

A new mid-range 55-inch TV costs $400 to $700.

The math gets obvious fast. For a 2018 QLED, a $60 board is worth it. For a 2015 model with a $330 repair bill, a $380 new TV wins.

Check Samsung's official support site for your model's warranty status. Some panel defects are covered up to five years, depending on region. That coverage makes repair a no-brainer.

If you're handy, board replacements are plug-and-play. Backlight work is riskier because the panel can crack. That job is for a professional.

When in doubt, get a firm repair quote before paying any diagnostic fee. A quote over $250 on an older TV usually means it's time to upgrade.

Frequently Asked Questions

Why does my Samsung TV keep turning on and off by itself?

The most common trigger is HDMI-CEC, which Samsung calls Anynet+. A connected device sends a signal that starts a power loop. Disable Anynet+ in the settings menu first.

Then do a hard reset by unplugging the TV for 60 seconds.

How do I know if my Samsung TV has a bad power supply?

Look for a blinking red light on the TV. The blink pattern is a diagnostic code. Three short blinks often mean a power supply fault.

Also listen for a clicking sound. That's the relay failing because the capacitors can't hold enough charge.

What is the flashlight test for a Samsung TV?

Turn off the room lights and shine a bright flashlight close to the screen. If you see a faint image or menu, the backlight is dead but the panel works. If you see nothing at all, the panel or main board is likely the problem.

Can a firmware update cause a Samsung TV to boot loop?

Yes. A corrupted update can crash the Tizen operating system during startup. The TV tries to boot, fails, and restarts.

A hard reset often clears it. If not, you may need to reinstall the firmware from a USB drive using Samsung's manual update process.

Is it worth fixing an old Samsung TV?

If the TV is over seven years old, replacement is usually better. The technology has improved a lot. If it's under three years old, repair is almost always worth it.

Between four and six years, compare the repair cost to the price of a new comparable model.