1997 RCA BIG SCREEN CONVERS PROBLEMS PTK195BL

HELLO,
IM HAVING PROBLEMS WITH MY RCA BIGSCREEN IT HAS A BOW AT THE TOP AND BOTTOM. RAINBOW COLORS AROUND THE OBJECTS IN THE PICTURE. CAN ANYONE TELL ME WHAT IT IS THAT NEEDS TO BE REPLACED AND WHERE TO FIND THE PART? IF I NEED TO ADJUST SOMETHING HOW DO I? I WOULD LIKE TO FIX IT MYSELF IM PRETTY GOOD AT FIXING THINGS I JUST NEED A LITTLE HELP FINDING THE PROBLEM AND WHERE TO GET THE PARTS
THANKS, SHAGGY