I own a JVC AV-21SX2EK TV and only recently the screen has dropped to about half way. It sort of flickers there and may move back towards the top with a tap on the side but invariably moves back to about half way again.
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Try Reseting It Unplug It For 30 Seconds And Then Release And Plug It Back In Once You Go To Turn It On Hold The On/off For 10 Seconds and Then Release. This Will Hopefully Restore The Factory Setting And You Can Determine If Its A User Setting Or Hardware Problem.
On the inside of the TV, on the flyback transformer there should be two controls. Turn the one that says "screen" very slowly clockwise while looking at the pix. The pix should get brighter as you turn it up- if you go to far you will see lines in the pix or the TV may shutdown.
I imagine when you are goin tru the captions options each one is being highlighted ,when you get to the last one press the arrow down button and FINISH should appear and it should be highlighted the press the arrow to the right or to the left to save,the press menu to exit.Check this http://books.jvcservice.com/download/909020829/19165.pdf....pages 13 and 19