|Was it a second-hand TV? Sounds like the thing was left on a certain frame for 10x2.5 (or your best guess) hours and has an image burned into the screen. It's probably junked.|
Unless you can give us more background on the TV's previous use/owner and your current setup, we can't say anything more. (i don't normally do much A/V stuff so ???)
Not everyone can decipher Klingon script...
chay' ta' SoH tlhe' vam Doch Daq