How to Fix a Green, Black or Blue TV Screen (STEPS)

Why is My TV Screen Flashing Different Colors?

Some possible reasons why your TV is flashing different colors:

Table of Contents

Diagnostic color test.
Self-test mode.
Loose video input wires.
Magnets near the TV.
Damaged or dirty video input.
Bad T-Con board.

Diagnostic color test

A TV that flashes different colors means that it’s entered a diagnostic color test. To exit this mode, make sure the TV is on. Press and hold ‘Menu’ and ‘Enter’ on the remote together, then press the power button.

Self-test mode

On your TV’s remote control, press the up arrowbutton then the down arrow button. After pressing the buttons, unplug your TV from its power source within 5 seconds.

Wait 15 seconds and plug the TV back in and wait another 10 seconds to turn it on and test if it has gone away. If it doesn’t work, repeat the procedure but with the left and right arrow buttons instead.

This should solve the issue but if it doesn’t, access your TV settings and turn Self-Test Mode off.

Loose video input wires

Check that all the wires are firmly connected for the TV, receiver or cable box.

Magnets near the TV

Surround sound speakers often have magnets inside them, so take care to place them further away from the TV. Always keep magnets away from TVs.

Damaged or dirty video input

Unplug all video input wires and check that they aren’t dirty or damaged. If they are damaged, such as split cords or cracked wires, replace them. Clean the inputs if they are dirtyand plug them back in accordingly.

Bad T-Con board

Your T-Con (timing controller) board may be going bad, which will require disassembly of the TV to diagnose. Depending on the age and type of your TV, this may or may not be worth it.

Look up your TV model to find out the exact problem. If you think that the T-Con board is going bad, replacing it or professionally fixing it is the only solution.

Troubleshooting TV Screen Colors

Color on TV Screen	Problem	Solution
Green	Loose or damaged cable connection	Replace cable connections
Purple + Pink	Magnetic interference / Faulty HDMI connection	Move electronic items further / Replace HDMI cable
Black	Loose connections or inactive power sources / Defective LED	Reconnect loose cables and check power sources are turned on and connected / Replace LED
Blue	Loss of video signal or signal	Ensure input source is turned on and set to an active channel
Multiple	Stuck in Purity Check Mode or Burn In Mode	Reset EPROM or access service menu

Why is my TV Screen Green?

A green TV screen usually means that there’s a loose or damaged cable connection from a media component to or from the TV.

Common problems of a green TV screen:

On a CRT TV, the tubes may be faulty or there may be magnetic interference.
On an LCD TV, there may be a loose or faulty ribbon cable.
Bad T-Con board.
Hue and color temperature settings are not properly adjusted.

How to Fix a TV Screen that is Green?

A television screen that’s gone completely green or has a green tint can be annoying, but it’s easily fixed.

Follow these steps to fix a TV screen that’s green:

Find out if it’s the input source causing the problem by putting on a DVD or Blu-ray to check that the green is being produced by your TV.
Check that your cables are properly and firmly connected, and if the problem persists, try using different working cables.
Move your surround sound speakers further away from the TV to prevent magnetic interference.
Go into your TV’s settings to properly configure the hue and color temperature settings.
Replace your T-Con board.

If any of these repairs require disassembly for the TV, use caution as voltage can still be in the transformer for up to 2 hours after unplugging the TV.

Why is my TV Screen Green and Purple?

A green and purple TV screen that changes color suddenly or has the color changing by the sides and edges of the screen could mean a few things.

These are the most common reasons of a green and purple screen:

Magnetic interference from a nearby electronic device.
Faulty or loose HDMI connection.

These problems are easy to fix and don’t require any disassembling. Simply move all electronic and magnetic devices further away from the TV until there isn’t any visible color on the television.

For a loose or faulty HDMI connection, remove and reinsert the cable, making sure that it is firmly connected. If that doesn’t work, buy a new HDMI cable of good quality.

Why is my TV Screen Green Red and Blue?

A TV screen that has turned green, red and blue could be caused by several factors, such as:

Stuck in Purity Check Mode.
Stuck in Burn In Mode.
Color tone isn’t adjusted properly.

If the TV cycles through full screen green, red and blue, that means it’s in Purity Check Mode to check for inactive pixels or in Burn In Mode.

A green, red and blue tint means that the TV isn’t properly adjusted.

How to Fix a TV Screen that is Green Red and Blue?

A TV screen that has turned green, red and blue could be stuck in Purity Check Mode, Burn In Mode, or the color tone hasn’t been adjusted properly.

These problems are easy to fix and don’t require any disassembling. Follow these steps to fix the issue.

TV stuck in Purity Check Mode

Simply press the Exit button, and if it doesn’t work, follow the steps below.
Reset EPROM in the TV by unplugging the power cord, then press and hold the power button on the TV itself for 20 seconds. Then plug it back in and power it up.
Press the up then down arrow buttons on the TV remote and unplug the TV, then plug it back in. If this doesn’t work, there’s a problem with the TV’s EPROM which can’t be fixed without a technician.
Stand close to the TV’s power cord and press the up then down arrow buttons on the remote and quickly unplug the TV within 5 seconds. Wait 10 seconds before plugging in the TV and checking. If it doesn’t work, repeat the procedure with the left and right arrow buttons.

TV stuck in Burn In Mode:

Access the service menu from the TV remote and enter the secret code to the service menu.
The secret code should be in the TV’s manual or try looking up the model and secret code online.

TV’s color tone isn’t properly adjusted

Press the Home or Menu button to access the TV’s menu. But if the menu screen also has the same problem, your TV may have a malfunction that needs a technician to fix.
If the menu screen is fine, continue to adjust the color tone or picture settings to your liking.

Why is my TV Screen Black?

A black TV screen could be caused by a number of problems, depending on whether there is still sound playing or not. These problems include:

Loose connections or inactive power sources.
Sleep timer or power saver mode turned on.
Defective LED or LED strip.
Faulty TV panel.
Faulty T-Con board.

How to Fix a TV Screen has Gone Black?

Learn about what to do when your TV screen has gone black. Follow these steps to fix the problem.

Loose connections or inactive power sources

Check connections between TV and power source, cable box or other input sources.
Determine connections are secure and turn on the TV. If it powers on but remains black, check the cable box or other input sources. Otherwise, check that the TV is set to the right input.
Unplug the cable box or other input sources and wait 30 seconds, then plug it in again and test the TV again.

Sleep timer or power saver mode turned on

Navigate to settings on your TV.
Select sleep timer or power saver mode and turn it off.

If the TV turns on and has sound but no image, the following could be the issue.

Defective LED or LED strips

The LEDs provide the backlight for the picture. Confirm this by pointing a flashlight at an angle to the turned on screen.
You should be able to see a shadow of the picture on the screen. This means that the backlight has failed.
Call a technician to repair or replace it for you.

Faulty TV panel

Check that your TV screen isn’t cracked.
If it isn’t but there’s no picture on screen, the TV panel might have failed.
Call a technician to repair the panel for you.

Faulty T-Con board

Point a flashlight at an angle to the screen that is turned on.
If you don’t see a shadow of the picture on the screen, the T-Con board is most likely to be at fault.
Call a technician to repair or replace the board for you.

Some of these repairs require disassembly for the TV, proceed with caution as voltage can be stored in the transformer for up to 2 hours after unplugging the TV.

Why is my TV Screen Blue?

A blue TV screen usually means the loss of video signal or signal completely. It could also mean these things:

The most common problem of a completely blue screen is that the source device has not been set to the proper mode.
A blue tint on the screen could be caused by failing backlights.
No DC power supply to the TV.

How to Fix a TV Screen that is Blue?

Several things can be done to fix the problem.

Completely blue screen:

Check that the TV’s receiver is on and the cables are firmly connected. Navigate to input settings on your TV and go to another HDMI port where a device is connected.
If that doesn’t work, reset the receivers and the TV by unplugging them for about 20 seconds. In that time, unplug the HDMI cables and reinsert them accordingly. Plug everything back in and test your TV.
If the picture still doesn’t show, there may be a malfunction with your TV. Call a technician to resolve the issue.

Blue tint on screen:

Replace the backlights.
Call a technician to do this for you, or buy a new TV depending on if it’s worth the repair costs or not.

No DC power supply to the TV:

Replace the DC supply voltage coil.
Call a technician to do this for you as it requires disassembling the TV.