Total Assembly Line Process; Write Hdcp Key; White Balance Adjustment; Function Check - LG 31MU97 Service Manual

- EDID Ver. 1.3 FOR HDMI1/2 PBP Data ( 256 Bytes )
- EDID Ver. 1.4 FOR DP/MiniDP PBP Data ( 256 Bytes )

3.3. Function Check

3.3.1. Check Screen
■ Check input and signal items. (cf. work instructions)
1. HDMI1/2 (4096 x 2160 @24Hz)
2. DisplayPort1.2 (4096 x 2160 @60Hz) - using PC
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes

4. Total Assembly line process

4.1. Write HDCP Key

- Write HDCP Key into EEPROM by using DDC2AB protocol
& HDCP Adjustment Jig equipment.
- If error is occurred, try to write again.

4.2. White balance adjustment

- Adjust PRESET Warm(6500K) Color coordinates and
Gamma calibration .
■ Input Gamma calibration Pattern (R,G,B, Grey 20 )
■ Set as Warm(6500K) by commanding COLOR_MODE_
CHANGE Command code.
■ Gamma calibration and verify
Start - Read Elapsed time - Measure - Verify - Output
Report - End
■ Warm(6500K) Color adjustment.
Adjust to meet x/y color coordinate as below.
2~4 min 4~8min
x 0.318 0.318
y 0.339 0.338
* Save Warm(6500K) Color by commanding COLOR SAVE
Command code.
Insert HDMI Jack which is connected with PC for White
Balance or equivalent device.
-> Total Assembly line should check whether the color
coordinate(x,y) data refer to below table were meet or not.
Color Temperature
Cool Medium
9,300k 8,000k
°K °K
X=0.283 X=0.295
(±0.03) (±0.03)
Y=0.298 Y=0.305
(±0.03) (±0.03)
<Test Signal>
Inner pattern
(255gray,100IRE)
*Note : x,y coordinates are drifted about 0.007 after 30 mins
heat-run. So checking color coordinate within 5-min at
total assembly line, consider x,y coordinates might be
up to 0.007 than x,y target of each color temperature.
- 6 -
8~10min 10~25min 25~40min
0.317 0.316 0.314
0.337 0.334 0.332
Luminance(cd/m2)
Warm Cool Medium
6,500k Min : Min :
170 200
°K
X=0.313
(±0.03)
Y=0.329
(±0.03)
<Test Signal>
Inner pattern
(255gray,100IRE)
LGE Internal Use Only
40min~
0.313
0.329
Warm
Min :
260