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It maybe due to the disorder in the picture tube of your T.V. or it maybe the moisture in present in or on the picture tube. Try to clear out the moisture and if it dosen't work then change the picture tube.
U have a CRT tube analoge standard tv,this feature will not work for a CRT analoge standard tv.Zoom in and out,picture sizes like 480,720 and 1080.The analoge tv can't get the tv signal ranges beyond 480i that why u have black sides bars picture,if u have a HD TV like a LCD tv or Plasma tv,than the Zooming in feature will works.
Well, first the 100Hz issue. Your TV will display a descriptor or the signal it is receiving, not a descriptor of the picture you are watching. Your TV panel has a native resolution and frequency. In your case, that frequency is 100Hz. Everything, like it or not, must be converted to 100Hz for the TV to work. In your manual, you are simply adjusting setting which smooth the picture and make it flow better than it would at 50Hz. This feature is slight of hand and is probably working just fine. As for the picture fitting the screen; HD programs fill the screen of HD channels.... SD (Standard Definition) programs use black bars on each side when on HD channels. You can use any available wide or picture size feature your TV may have to stretch the picture. You may be unable to stretch the picture, due to restrictions (some TVs will not resize HD formats).
There are two small holes on the rear side through which you can adjust focus and screen. Use a flash light and locate the two adjustable slots inside the holes. This part carries high voltage. Do not use a metal screwdriver to adjust. Put the TV facing a mirror so you can see how it works. Do not turn more than 1/8th of a turn. The focus control makes picture sharp or fuzzy. Screen control could change brightness. While watching the picture in the mirror, slightly adjust the screen control. Do not turn too much. If it doesn't work, then call a JVC authorized repair center.
Sounds like you may have caps going bad . Adjusting may tend to only stretch the the picture too much . Also when you say horizontal are you saying the top and bottom are closing in ? If yes then your problem is in the vertical section . If side to side then check the horizontal section . Good luck
Sounds as though you have a leaking Capacitor in the horizontal section. The problem capacitor is likey to be orage in color and rated at 2kv or higher. Located next to the High Voltage transformer ( Flyback transformer ). Be very cautious if you are changing this, or any part yourself as the picture tube can charge high voltage ( up to 35,000 volts ) for a long period of time. Always discharge the picture tube first before servicing a set.
Replace the capacitor with a like part with the same or higher voltage rating and the same capacitance number ( mfd, pfc,or such ) as listed on the side of the part.
I called RCA about this and first was told that it was my cable company till I told the rep that it does this even when I unhook the cable. I was then told that I could take it in to get it fixed and that even it it was a bad part on their end that I could end up paying for it as if might be the pictue tube or the screen. Guess this will be the last RCA that I ever buy again.
No my friend, there is a problem with the width circuit, and this would be in the pincussion correction circuit of the TV set. There is alot of high voltage in this circuit, and if you have no TV repair experience, play it safe and call in a tech to service this for you. there is not any adjust ment that will fix this. Good Luck