Picture doesn't fit screen

Nope. The picture resolution has to be 1080 to fill the screen completely. Using stretch and zoom will distort the low rez pictures. No option to change resolution on the TV itself.

You may have to go into service mode and change size, if you can't get it in customer's

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).

Sometimes the box that sends the signal to the TV preconditions the signal to 4x3 or 16x9, depending on the capability of the TV. I always opt to the "no fit" option and allow the intelligence of the TV to fit the screen.

If you have "off air" TV signal without that preconditioning, I cant help.

The broadcaster is sending a HD signal and the new digital signal spans past the resolution of the TV. Settle with it or upgrade.

You need to check the aspect or screen size settings on the TV as well as your signal scorce IE: cable box, satelitte if they are HD?

if your tv has a format button on it just press it until your picture is to where you like it. plus if you have a hd reciever it also has a format setting on it to.

if you have HD cable try shrinking the picture there. LCD's are not subject to 'bloom' like
analog tvs. try the aspect button on the remote.

wrong picture size on a digital tv is a result of the input signal.

With an HDMI cable connected, the cable box determines the picture size. The settings on the cable box must be changed in order for you to get the correct picture size. I have some experience with Motorola cable boxes; usually to access the settings you turn the box OFF and then press the menu or settings button on the box to bring up the display menu. Hope this helps!

the source has to be set to16 x 9 output also the tv may need to know that it is receiving 16 x 9 input or 3x4 input hope this helps