Sony KP-51HW40 Service Manual page 173

Using the Features
42
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When you adjust the twin screen sizes, the projection TV memorizes
the change. The next time you use the Twin View feature the
memorized sizes appear.
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Hookups that affect your ability to use Twin View:
- If you are viewing all channels through the cable box, the Twin
View feature will not work. The cable box only unscrambles one
signal at a time, so the right picture will be the same as the left
picture.
- You can watch a scrambled cable channel and another video
source. Be sure your DVD player, VCR or satellite receiver are
connected to one of the VIDEO IN 1-6 and AUX inputs on the rear
of the projection TV. Pictures from equipment connected to VIDEO
5, 6 and AUX will only appear in the left picture, not in the right.
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The active picture is highlighted in cyan.