LG 27UL500 - Signal Composition for Adjustment; I2 C Communication and Commands; Screen Adjust Commands

6.Signalcompositionforadjustment
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6.1I2C(100KBPS)
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6.2COMMUNICATIONSTART
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STAR
T
 6EA STOP 50Ms
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#UntilACKBITgoesLOW,Repeatit.
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6.3Commandform.
CommandformuseDDC2ABstandardcommunicationprotocol.
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START6EA50ALENA03ACMDA00AVALACSASTOP
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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) 
Adjustment contents CMD(hex) ADR VAL(hex) Explanation
EEPROM ALL INITIAL E4 00 00 adjustment Initialization
EEPROM READ E7 Slave add At EEPROM Read
EEPROM WRITE E8 Slave add Data Write data at EEPROM
R GAIN 16 00 00-64
Tune Gain
G GAIN 18 00 00-64
B GAIN 1A 00 00-64
BRIGHT(Backlight) 10 00 00-64 Tune Analog Bright
FACTORY RESET F0 00 00 Factory reset
AUTO_COLOR_ADJUST F1 00 0
AUTO COLOR Tuning
0:Auto color
COLOR_MODE_CHANGE
F2
00
01 6500K
02 9300K
Elapsed time Clear E9 00 00 Aging off &Clear elapsed time
Aging On/Off F3 00 FF/00 FF:ON / 00:OFF
Input Select F4
00
0x90
0x91
0xD0
0xD1
0x90 : HDMI1
0x91 : HDMI2
0xD0 : DP
0xD1 : Type-C
SYSTEM RESET F5 00 00 Restart System
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