POLAROID TV HAS NO PICTURE

Question

HI, I BROUGHT MY DAUGHTER A POLAROID MODEL # TLA 01511C. LAST NIGHT THE PICTURE WENT BUT WE STILL GET SOUND. I CALLED THE STORE BUT THEY NEVER SCANNED THE SERIAL #. POLAROID WONT TOUCH IT WITHOUT A RECIEPT. HOW CAN I FIX THIS MYSELF. I AM PRETTY GOOD WITH THESE THINGS. JUST NEED EXPLANATION.

THANKS