Samsung tv started flashing (white) after it is on for any period

Plasma is old technology and it is 16 years old and made in Mexico, the worst place for quality control. It is time for a new one, or at least an upgrade. Or you can get a board kit and take a chance on fixing it.

Samsung HPT5054X/XAA Service Manual

ManualsLib https://www.manualslib.com > ... > HPT5054X/XAA

View and Download Samsung HPT5054X/XAA service manual online. Plasma Display TV. HPT5054X/XAA plasma tv pdf manual download. Also for: Hpt4254x/xaa, ...

Boards for it.

https://www.google.com/search?q=Samsung+plasma+tv+model+HP-T5054+board+kit

It sounds like the screen may have failed, that means a new TV will be needed.

Your color wheel is going bad, when it fails the TV colors will be way off and it will shut down. They range from $50 -$125 . Here is one for $98 for your tv. http://www.amazon.com/Projector-Replacement-Samsung-HLN507WX-HLN567/dp/B00HJOLQ7G

Samsung just told me they wouldn't fix my tv because it was produced in Nov. of '06 and the only ones they would fix were made in August of '06 or earlier. I am way too angry right now to call the service tech number they so very nicely provided.

Lamp replace it ,Mats Electronics has them $99.00
1-800-628-1118

In most cases this is due to the fact that the color wheel has shattered into pieces and will need to be replaced. Replacing the color wheel is not too easy, but if you are technically handy it isn't that tough to replace either. The part number for the color wheel is BP96-00250A and will run between 80-130 dollars for the part.

sounds like you have a power supply or inverter gone bad

Try HDMI if the TV has the inputs or swap the component cable.

its sounds more like the digital board that needs to be replaced

The negative image on the screen is the DMD board (Digital Mirror Board). The cycle sound is the color wheel trying to spin but if the DMD board is going bad, it will effect the color wheel and not spin. There for your image will freeze.