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Sounds like a failed vertical amplifier circuit. This is normally primarily contained in an integrated circuit mounted on a heatsink.
There are other possibilities along the line but the one above is the most likely.
Now all you need is a TV repair shop that is still in buisness.
NTSC is the (analog) standard passing into history in Feb. '09 and ATSC is the new digital standard being used afterward for over-the-air (reception by antenna) broadcasts.
This changeover affects only the broadcast channels and if you have cable or satellite reception the changeover will happen whenever they find they can't charge their captive audience such a high premium for HD.
I found no evidence that your set is ATSC ready so if you are receiving your signal by antenna, you need to scurry about and buy a converter for your set.
Make sure the one you buy is on the list of 'approved' models to which you can apply the $40 coupon(s).
Coupon & info site
Your TV is set for standard broadcast.
You need to go to the set up menu and change from antenna/normal to cable mode.
In standard broadcast mode you receive off the air programs 2-13 vhf and 14-83 uhf.
In the cable you receive 2-13 and cable channels 14 -125 if the set is not too old.
When cable channels first came out some sets would just cover 14- 36 or 14- 47 or 14-66 etc.
The newer sets cover the now standard cable channels 14-125. Hope this helps you