LG 62SX4R Service Manual page 22

9. HD4(DLP) Engine Tilt / Adjustment the
Keystone
: Apply Mode -> 62SX4R-AB
1) Geometry
(1) When the upper portion of the screen is larger than the
bottom : Projection lens may be upward.
(2) When the upper portion of screen os smaller than the
bottom : Projection lens may be downward.
(3) When the horizontal line is tilting in the Cross pattern :
Engine Base may be rotating with the left/ right.
2) Geometry, Adjustment
(1) When the screen is rotated : Rotate all Engine.
a. Distortion Type : Tilt
b. Adjustment Method : Rotate the Engine Base on the
right or left side so line of the Cross pattern will be level.
(2) In case of the upper screen size is large bottom screen
size than : upward projector.
a. Distortion Type : Keystone
b. Adjustment Method : Raise the front panel as looking
downward the projection lens and then bottom screen
size is large so the image will be level.
(3) In case of the upper screen size is smaller bottom screen
size than : downward projector.
a. Distortion Type : Keystone
b. Adjustment Method : Lower the front panel as looking
upward the projection lens and then upper screen size
is large so the image will be level.