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1.5.3
EDID data write protect control function
Function
An EDID data write protection function is provided to prevent the monitor's EDID data from
being damaged by an external source. However, to enable writing of the EDID data in the
production process, the EDID data write protection can be set or canceled (only when the
monitor power is ON) by using the DDC2BI or DDC CI function with the DDC communication
line, or by using the factory 1 OSM function. The DDC2BI or DDC CI function is supported by
the DVI-I connector (D-SUB connector supports only DDC2B), so the EDID data write protec-
tion for EEPROM at the D-SUB connector side must be set and canceled via the DVI-I connec-
tor. Internally, by setting the microcomputer's pin 37 /WP port to Lo, the EDID data write
protection will be set. This will be canceled when set to Hi. /WP is fixed to Lo when the moni-
tor power is OFF. The default value for /WP when the monitor power is ON is Lo. The value is
not saved even when changed, so once the AC power is turned OFF, the value will return to
the default value Lo.
µ
-COM Pin No.
37
43
42
41
40
I/O
O
I
I
I
I
Signal name
Remarks
Function
/WP
P_ID0
P_ID1
P_ID2
P_ID3
M24C02WMN6T
Pull-up / Pull-down
EDID data write protect setting: Lo/Cancel: Hi
LCD panel module setting
List of control signals
DIGITAL E2PROM
ANALOG E2PROM
Monitor internal power
(Hi : Monitor AC = ON)
Microcomputer port /WP
(Lo : Protect = ON)
DVI external power + 5VDC
(Hi : Asset management = ON)
Monitor internal power
(Hi : Monitor AC = ON)
Microcomputer port / WP
(Lo : Protect = ON)
D-SUB external power + 5VDC
(Hi : Asset management = ON)
Lo
Lo
Hi
Hi
Lo
Lo
Lo
Hi
Lo
Hi
X
X
DVI-I connector side
DVI-I connector side EDID data R (Read) / W (Write) ability
D-SUB connector side EDID data R (Read) / W (Write) ability
ANALOG E2PROM
Lo
Lo
Hi
Hi
Lo
Lo
Lo
Hi
Lo
Hi
X
X
D-SUB connector side
R disabled / W disabled
R enabled (when selected)
/ W disabled
R enabled (when selected)
/ W disabled
R enabled (when selected)
/ W enabled
R disabled / W disabled
R enabled (when selected)
/ W disabled
R enabled (when selected)
/ W disabled
R enabled (when selected)
/ W enabled
R disabled / W disabled
R enabled / W disabled
R enabled / W disabled
R enabled / W enabled
Summary of Contents for LCD1550X-BK
Page 88: ...SCHEMATIC DIAGRAM POWER LCD1550X Normal Power Save 1ch Pin 4 2ch Pin 1 3ch Pin 2 4ch Pin 5 ...
Page 89: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X ...
Page 90: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X ...
Page 91: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X ...
Page 92: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X ...
Page 96: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X ...
Page 97: ...SCHEMATIC DIAGRAM INVERTER LCD1550X 1ch Q701 B 2ch Q702 B ...
Page 98: ...SCHEMATIC DIAGRAM PWB SW LCD1550X ...
Page 100: ...SCHEMATIC DIAGRAM POWER LCD1550X ...
Page 101: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X ...
Page 102: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X ...
Page 103: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X ...
Page 104: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X ...
Page 105: ...SCHEMATIC DIAGRAM PWB MAIN MC LCD1550X ...
Page 106: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X ...
Page 107: ...SCHEMATIC DIAGRAM INVERTER LCD1550X ...
Page 108: ...SCHEMATIC DIAGRAM PWB SW LCD1550X ...
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