Well you should clarify more but i am assuming that your tv is set on widescreen mode and the only way to get rid of the bands is by using the menus to switch your screen format
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if that 2 band according to you from top to bottom,it has a defective vertical stage.if this two band appears one on top and one at the bottom,it`s on vertical stage.leaky capacitors,resistance changed or resistor devalued ang ic`s, are too weak to amplify a signal to make the screen complete....
According to all the tech sheets I can see, this unit has no Tuner. If your using the cable box to change channels it probably doesn't support HDTV, except maybe for the individual channels. You might be able to access your TV's on-screen menu to change the way programs are displayed.
Usually on your remote control is an option to change screen size or resolution. If not, the on your remote go to "setting" or "menu" or something that will get you into tv setup. once you get there you should be able to set you tv to Standare, WIDE, WIDE zoom, letterbox, or some other setting. I suggest you experiment with what looks best to you If you are seeing the bars at top and bottom you re currently in "standard" mode.
If it is black vertical band from the top all the way down to the bottom of the screen, your LCD panel is going bad and you will see more bands and it will get worst.
Is the picture you have complete? Is there a black band along the top as well? If so, it may be because you are providing an HD aspect ratio of 16:9 instead of the TV native 4:3.
Try hooking up a VCR and watching a tape. Do you still have the black band on the bottom?
try adjusting the aspect ratio. on widescreen movies or shows you will still get the black bands on the top and bottom. if you play with the aspect ratio you can sometimes get rid of it
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