LG RT-44SZ80LB Service Manual page 16

(2) Equipment composition : Follow <Fig2>
Adjust at same condition of equipment composition diagram.
(3) Preparation for Adjustment
Compose the equipment follow Fig2 and place the set on the
fixation stand.
1) Select the VDP Test Pattern signal to R1, G1, B1.
2) Press the Adjust key to select M62352 and then select
RVREF, GVREF, BVREF in adjust mode
3) Adjust the luminance of CA100 to be below 0.75Cd by
volume key.(Range : 196~ 202)
4) Exit adjustment mode by pressing Adjust key.
5) Press the IN-START key on the remote control and select
the 7050 RGB Set of adjustment mode and then press the
G key.
6) Check the data value of Rcontast, Gcontrast, Bcontrast is
515, Otherwise set the data 515 by using volume key.
(4) Adjustment Sequence
1) Output 255,255,255 signal of VDP TEST PATTERN, then
display maximum WHITE PATTERN on screen.
2) Gamma Adjust Mode is display as below when select
Gamma adjust by pressing ADJ key on remote control.
Gamma
R:4 G:5 B:6
285 299 247
394 514 400
453 574 505
--------------------------
--------------------------
828 838 831
3) Change the 16 Step RGB data to select white balance
x:283, y:297(D9300K)
4) Measure the luminance with changed data.
5) Set the every Gamma data of 16 step to 2.2 on the basis of
measured luminance data in 3)clause. (Max luminance
*(n1/16)**2.2)
--- Max luminance : measured luminance data n1 : every
step unit when separating signal level to 16 step
6) Output the 240, 240, 240 (15th data in max white output
signal level) in the VDP Test Pattern, change the 15th
RGB data value to come out white valance x=283,
y=297(D9300K) and measured step luminance in 5)clause.
7) Output the 224, 224, 224 (14th data in max white output
signal level) in the VDP Test Pattern, change the 14th
RGB data value to come out white valance x=283, y=297
and measured step luminance in 5)clause.
8) As shown above, output the VDP Test Pattern signal
(208/192/176/160/144/128/112/96/80/64/48/32/16) and
change the RGB data value of each step to come out white
balance x=283, y=294 and measured luminance in
3)clause.
(5) Gamma adjustment manually
This adjustment is only to be done after the Gamma and
White Balance adjustment are are adjusted.
1) Prepare the PC Pattern Generator which is possible to
output R/G/B of 16 step and 64 step Gray Pattern.
2) Equipment composition : Follow Fig2.
3) Turn on the Jig for adjustment.
4) Select the RGB_PC by pressing the input select button on
Remote control.
*First column : R adjustment
data display
*Second column : G adjustment
data display
*Third column : B adjustment
data display
5) Output the 16 Gray Pattern in PC Pattern Generator.
Check it with the naked eye whether Screen Gamma nad
W/B is right about each Gray.
If itÕs not, press the ADJ button on Remote Control and
then adjust the level data of each step manually in sub
menu of 4, Gamma Manual adjust.
6) Output the 64 Gray Pattern in PC Pattern Generator. it with
the naked eye whether Screen Gamma nad W/B is right
about each Gray or whether there is Gamma noise.
(If thereÕs any problem, adjust in 5)
7)After finishing adjustment, exit adjustment mode by using
ADJ button on Remote Control.
8. White Uniformity Adjustment
(1) Required Test Equipments
1) Uniformity measuring equipment : Equipment which can
measure chromaticity in the whole screen
2) Set stand : 1EA
3) Remote controller for adjustment : 1EA
4) Circuit thing Jig for Adjustment (Except Driver Board Assy
of adjustment model)
--- Programmed Digital Board so that the VDP Test Pattern
can output white signal by 1level form 0 to 255 level.
(2) Equipment composition
Compose the equipment as Fig.2
(3) Preparation for Adjustment
1) Composite the equipment as shown Fig.2, and place the
set on fixation stand.
2) After inputting company channel 13, adjust colour
uniformity like Horizontal/ Vertical position adjustment of
input signal part adjustment by using remote control for
adjustment.
3) After pressing IN_START key on remote control for
adjustment, select the adjustment mode 7050 Uniformity.
<Resister Explanation about uniformity adjustment>
1. RamCtrl : s/w saving uniformity write order (Do not adjust)
2. CSHP : Horizontal start point designation --- adjustable
3. CSVP : Vertical start point designation --- adjustable
4. CEHP : Horizontal END point designation --- adjustable
5. CEVP : Vertical END point 6.designation --- adjustable
6. Mode : uniformity mode select --- adjustable if need
*** 0 : 221point & 3level ---- default value
*** 1 : 221point & 4level
*** 2 : 825point & 3level
*** 3 : 825point & 4level
7. KHH : Upper 2byte of horizontal line correction coefficient --
Change according to CSHP, CEHP value.
8. KHL : Upper 2byte of vertical line correction coefficient --
Change according to CSHP, CEHP value.
** How to calculate KHH, KHL value
LCD panel size = 1280 x 720
Correction Point = 221 point
--> 17 horizontal points x 13 vertical points
(16 horizontal segments x 12 vertical point)
- 16 -