My TV occasionally has the picture breaking up affecting half the screen (top to bottom) or blurred images. Also breaks up when electrical switches are turned on/off or when mobile phones are on,even i-pads i think.Why is this ?

SOURCE: Vertical Green/Purple Lines on lower half of screen

I would contact RCA if the repair center dosent know how to troubleshoot this set. But I bet its an eeprom or ground issue. Contact RCA here at 580-634-0151 or At https://www.rca.com/secure/service/contactrca/1,,,00.html Good Luck

SOURCE: 3 curved lines top & bottom/blurred picture

This indicates a convergence problem..convergence power supply probally.. however ive seen 2 other cuicits cause this ..

SOURCE: 1/2 the screen is blurry

Starting on the 16 Jan, I have the very same problem with my TV..

SOURCE: RCA Projection TV model #p61926

The convergence circuit is your problem and most times with this model the convergence power supply bd. is the problem.

SOURCE: Image Distorted

This is a classic convergence problem. Please confirm that your model is 51H84 and whether or not you intend to repair this yourself. You will need to know how to solder. If you wish to attempt the repair, confirm the model and update this and I'll provide you with details and instructions.

Dan