We are using the 55 rear tv to display our logo for a talk show.

I assume you purchased the tv in the current condition you are describing. Philips are notorious for having cloudy glyconol coolant. The coolant is situated in a chamber between the light tubes and the lenses and is required in order to keep the tubes running cool or they would otherwise crack from the excessive heat from the light tubes. The coolant normally becomes corrupted in the blue tube first, with the red and green tubes following closely behind it. The Video that is able to project through the cloudy coolant causes a picture that is washed out, fuzzy, and can even cause rainbowy colors depending on how many chambers are cloudy.

If you want further proof that the glyconol is corrupted, you can have someone remove the rear cover and take off the lenses from the light tubes so you can see directly into the coolant chambers to determine which ones are cloudy. Replacing the coolant is an involved process. You should attempt to return the tv to the sales person for a full refund if possible and explain the tv is not okay as he said.