Sparking Sounds and the picture jumps momentarily.

You need to remove the back and observe where the spark is coming from while the set is on. Dimming the lights may help you. Sometimes you can see a blue glare accompanied by an ozone smell. You might even hear a sound such as a slow air leak in a tire. The most likely area is around the high voltage transformer or the picture tube anode. The transformer has the thick red wire or wires coming out of the top. Also follow the three red wires to the picture tube anode( the place where the red wire plugs into the tube) Use your senses, listen smell , and look for any blue glare or arcing to the metal frame. If you find the leak near or on the transformer use 100% silicone rubber to patch. Allow at least 12 hours to cure. If the arcing is coming from the picture tube contact me for detailed instructions. You must act promptly and find the source of the arcing before you have a dead set. In short, spark + flash = crash. Good luck