Adjustment Instructions - LG MU-42PZ90V Service Manual

White : 255 Gray level
(2) Press POWER ON KEY on the Adjustment R/C and select
RGB Cut.
(3) Press Vol. + key and operate TO SET(Black).
(4) Original Half Black/White(255 Gray) screen will be
presented about 5~10 seconds later. And Cursor moves
with a lower part Y-cut.
This case RGB Auto Offset, MAX Gain adjustment will be
completed.
4-2 Component Auto Offset & Gain
Adjustment
(Y, Pb, Pr Adjustment)
(1) Input Half Black/White (255 Gray) signal from a Pattern
Generator into the component Input. (1280*720p 60Hz)
White : 255 Gray level
(2) Press Vol. + key and operate To SET from the condition
where the cursor moves with the Y-cut.
(3) Original Half White(255 Gray) screen will be presented
about 5~10 seconds later. And Cursor moves with a lower
part Pb-cut.
This case Component Y-offset & Gain adjustment will be
completed.
(4) After adjustment of item (3), receive Half Blue(127 level)
signal for Pb-offset adjustment.
(5) Press Vol. + key and operate To SET for Pb-offset
adjustment.
(6) Original Half Blue(127 level) screen will be presented
about 5~10 seconds later. And Cursor moves with a lower
part Pr-cut.
This case Component Pb-offset & Gain adjustment will be
completed.
(7) After adjustment of item (5), receive Half Red(127 level)
signal for Pr-offset adjustment.

ADJUSTMENT INSTRUCTIONS

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(8) Press Vol. + key and operate To SET for Pr-offset
adjustment.
(9) Original Half Red(127 level) screen will be presented
about 5~10 seconds later and the OK indication appears.
This case Component Auto offset & Gain adjustment will
be completed.
You can check whether circuit adjustment is correct or not,
O
below. (Item 4-1)
(1) Display RGB to the Main picture, CVBS to the Sub picture
in TWIN PICTURE mode. (DOUBLE WINDOW)
(2) To check the Offset, input Full Black (0 gray) signal into
CVBS and RGB input part at the same time in the Pattern
Generator.
(3) To check the MAX-Gain, input Full White (255 gray) signal
into CVBS and RGB input part at the same time in the
Pattern Generator.
(4) Visually compare Black and White Levels. If there is no
Level difference, then the adjustment is correct.
You can check whether circuit adjustment is correct or not,
O
below. (Item 4-2)
(1) Display Component to the Main picture, CVBS to the Sub
picture in TWIN PICTURE mode. (DOUBLE WINDOW)
(2) Using HD STB(SK-010T) or equal equipment input Digital
Pattern into CVBS and Component input part.
(720p or 1080i)
(3) Visually compare Black and White Levels of Main and Sub
screen. If there is no Level difference, then the adjustment
is correct.