My televison screen keeps jumping back an forth from a larger image to the normal size image. This happens when the scene changes or when I change the channel. It sometimes stays normal for a while but then goes right back to changing sizes.
Your problem most likely is in your high voltage circuit, and the 160 volt radial lead capacitor is probably gone high ESR or changed in capacitence, this usually happens during bright sceens or sceen change.
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If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Keep in mind that not all programs and show are in widescreen format. When set to normal, you will get those black bars on the sides because the program is sized for the older TV's. Some TV's will have a zoom option, but that will cut off some of the top and the bottom of your picture.
Until everything goes widescreen, you are stuck in normal with those black bars or widescreen with the fat people.
I hate distortion in my TV image, so I am perfectly fine with my TV on normal.