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If there is distortion and noise, while using the TV, for on-air transmission, and there is no distortion or noise while using it AV, be sure that it tuner is faulty. Check the Ariel connection first, for discontinuity or loose contacts. If it found OK, replace the tuner. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter". http://electronicshelponline.blogspot.com/
At first the picture is ok, and then distorted with horizontal lines i thinks. If the horzontal lines are parellel acros the screen, with an inch apart across the whole screen, your tv needs screen adjustments. Screen voltage may be high. look into the crt base also. Change it first. These also not resolve the problem, LOT may be faulty, with respect to screen focus pack. May need replacement. Try first setting screen voltage to a lower settings and observe.
It must be connected with the color circuit of your tv, a board connected to back end of the tube. Could be dust, cob web or carbon deposit shorting a transistor. Popping noise if loud enough can be attributed to high voltage circuit fault and picture tube.
Sony doesn't want anyone to see a poor picture on a Sony tv so they have a circuit that blanks the video if there is a weak picture or any other problem concerning picture quality. My Sony factory Instructor told me this many many years ago. I'm feeling old...but anyway you need a technician. Sorry.
Move any speakers or electrical devices away from the set. It could also be anything electronic or magnetic. Anything near the set that generates a magnetic or electromagnetic field could be causing the distortion.
Can you post a picture of the TV screen with the problem? It will help in the diagnoses. It looks like you may have a thermal sensitive component causing this issue. But I will have to seen a picture of the screen to properly diagnose this problem as to the possible section that may be causing this problem.
it sounds like a convergence adjustment problem. If you hava book on the tv still read it, and it will tell you what to do, other wise, look for a convergence button on the front of your tv, and take the remote and push menu to bring up setup, and go convergence adjustment click it and hit the conv. button on the front of the screen. there should be to lines going vertical and horizontal, these are the limes you adjust with your remote, you have to adjust the red and blue, the tv should blink to let you know which color you are on. when you have them lined up right the line will be perfectly white. hope this helps
Is good that you hit it and it reacts,very likely you have loose conections in different places but for the distorted picture you need to check the horizontal driver transformer and flyback after that is corrected you need to check the complete chassis for loose conections.Take your time.Good luck.