LG 27GL850 Service Manual page 18

LG ELECTRONICS INC. / MONITOR DIVISION
Establish : 2019/03/29
Revision : 1
4. Total Assembly line process
4.1 EDID Serial Number Write
‐ This model DON'T need to write full edid data for update the Serial number.
Just write the S/N data by using adjustment command.
Send Serial data
Read C/s of Serial data
4.2 Verify HDCP Key
Check OSD with aging on mode or using Master Signal generator with HDCP On and connect to monitor with HDMI
4.3 Set Automatic Standby time
a. Set Automatic Standby time by adjustment jig equipment: Europe : 4H, Others: OFF
Command set : F7 00 01 ( for Europe – set 4h)
F7 00 00 (for others – set 0ff)
b. Check the Automatic Standby time setting value by adjustment jig equipment.
Please check the value of 0xA6 0xEE address
Value : 0x00 ‐ OFF
0x04 ‐ Set 4H
4.4 Gamma adjustment
Adjust PRESET Warm(6500K) Color coordinates.
Set the CA-210 for calibration.
Set the internal White Pattern by commanding WHITEBALANCE_START Command code.
Set as Warm(6500K) by commanding COLOR_MODE_CHANGE Command code.
Gamma 2.2 calibration and verify.
Warm(6500K) color adjustment
Adjust to meet x/y color coordinate as below.
2~4 min
0.315
x
0.331
y
Save Warm(6500K) Color by commanding COLOR SAVE Command code. (tolerance ±0.010)
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.
LM61C ADJUSTMENT SPECIFICATION
( EDID SN(4byte) + date (2byte) + Ascii SN(18byte) )
Read checksum data of 24 byte
4~8min 8~10min
0.315 0.315
0.331 0.331
Send 24 byte
10~25min 25~40min
0.314 0.314
0.330 0.330
5/11
40min~
0.313
0.329
LG electronics