Command Form - LG 34UM94 Service Manual

5. Signal composition for adjustment
5.1. I2C (100K BPS)
5.2. COMMUNICATION START
# Until ACK BIT goes LOW, Repeat it.

5.3. Command form.

Command form use DDC2AB standard communication
protocol.
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
5.4. Screen adjust command (LENGTH = 84)
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5.5. EEPROM Data Write
5.5.1 Siganl TABLE
LEN : 84h+Bytes
CMD : E8h
ADH : E2PROM Slave Address(A0,A2,A4,A6,A8,AA,AC,AE),
Not 00h(Reserved by Buffer To EEPROM)
ADL : E2PROM Sub Address(00~FF)
Data : Write data
Delay : 20ms
5.5.2. Command Set
No. Adjustment CMD(hex)
contents
1 E E P R O M
WRITE
2
* Use
■ FOS Default write :
<14mode data> write
SyncFlags,HPeriodH, HPeriodL, VtotalH,VtotalL,
SrcHTotalH, SrcHTotalL
SrcHStartH, SrcHStartL, SrcVStartH,SrcVStartL,
HsyncPhase
■ Temporary Data write: Write to particular address of
EEPROM.
- 7 -
LEN Explanation
E8 94 16-Byte Write
(84+n) n-byte Write
LGE Internal Use Only