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Hi , I`m Jack , a TV/AUDIO repairman with 40 years experience. Perhaps i can help you with this , please let me know when you are ready to proceed
If you open the tv`s own menu , does it show normal ?
What is connected to this tv ?Cable box,satellite,dvd,games etc. ?
In any case i suspect you are connected with component color coded cables and the red video (PR) has become loose or making bad contact .
Pull the plugs out and back in securely at both ends (cable/satellite box and tv)and see if the red comes back