Hisense 100L9H Quick Setup Manual page 13

If the bottom of the image is wider than the screen, then move
the Laser TV closer to the screen.
If the bottom of the image is narrower than the screen, then
move the Laser TV farther from the screen.
NOTE: Make sure the bottom of the image always stays parallel
with the screen. If not, rotate the Laser TV following previous
instructions.
ADJUST THE UPPER-RIGHT CORNER OF THE IMAGE
1. If the top of the image is lower on the left and higher on the
right, then use the wrench to rotate the front-right foot and
the back-right foot clockwise to the same height.
back-right foot
front-right foot
2. Now, rotate the Laser TV counterclockwise so that the
bottom of the image is parallel with the screen.
3. Repeat the steps above until the top of the image is parallel
with the screen.
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