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Since your tv is cutting the heads off durring regular or analog signal but not high deffinition sounds to me like you have to set the aspect ratio different or such as going to your picture format from the main screen. Play with the settings from zoom, full screen, no overscan, cinerama and see if this helps.
Try this setting and see if it helps:
Menu>Picture>Advance Picture Settings>Scan Velocity Modulation (Check mark it)
Then the TV will try to auto adjust it's picture size to the source you are using. I noticed it most on ESPN News HD.
If you are using a HD cable box, you might be able to use the cable box settings to change the picture size. Sometimes the box is on "Zoom" and it takes the top of heads off.
I HAVE A SANYO, ON MY REMOTE CONTROL IS A BUTTON "PIX SHAPE" this will change the sides and top/bottom. I have 4 settings. OR you might check you owners manuel as to where this button is. Possibly under menu. My Dads TV is a little different from mine. so your button might not be where mine is.
Your problem sounds like it could be a vertical sweep fault. Sounds like a vertical output IC or a capcitor in the sweep power supply or a waveshaper capacitor. All these faults, should only be checked and replaced by a pro tech, as there is a safety issue involved with the High voltage, and your going to need to know how to use the equipment to check these parts as in this case , you most likly wont be able to look and see whats wrong or what part is defective. Good Luck