LG 27GL850 Service Manual page 21

LG ELECTRONICS INC. / MONITOR DIVISION
Establish : 2019/03/29
Revision : 1
6.2 COMMUNICATION START
START
#Until ACK BIT goes LOW, Repeat it.
6.3 Command form.
Command form use DDC2AB standard communication protocol.
START 6E A 50 A LEN A 03 A CMD A 00 A VAL A CS A STOP
a. LEN : DATA BYTE number to send.
b. CMD : Command language that monitor executes.
c. VAL : FOS DATA
d. CS : Dada's CHECHSUM that transmit
e. DELAY : 50MS
f. A : Acknowledge
6.4 Screen adjust command (LENGTH = 84)
No. Adjustment contents
1 EEPROM ALL INITIAL
2 EEPROM READ
3 EEPROM WRITE
4
5
6
7 BRIGHT(Backlight)
8 FACTORY RESET
9
AUTO_COLOR_ADJUST
10 COLOR_MODE_CHANGE
11 Elapsed time Clear
12 WHITEBALANCE_START
13 Aging On/Off
14 Input Select
15
SYSTEM RESET
LM61C ADJUSTMENT SPECIFICATION
6E A
CMD(hex)
E4
E7
E8
R GAIN 16
G GAIN 18
B GAIN 1A
10
F0
F1
F2
E9
ED
F3
F4
F5
STOP 50Ms
ADR VAL(hex)
00 00
Slave
add
Slave Data
add
00 00‐64
00 00‐64
00 00‐64
00 00‐64
00 00
00 0
01
00
02
00 00
00
00 FF/00
0xD0
00 0x90
0x91
00 00 Restart System
Explanation
adjustment Initialization
At EEPROM Read
Write data at EEPROM
Tune Gain
Tune Analog Bright
Factory reset
AUTO COLOR Tuning
0:Auto color
6500K
9300K
Aging off &Clear elapsed
time
Start White Balance
adjustment (Display
Internal Pattern)
FF:ON / 00:OFF
1:DisplayPort
2:HDMI1
3:HDMI2
LG electronics
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