Ddc Instructions - Philips IJ6B2W/76 Service Manual

HP L2025
18 HP L2335
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General
DDC Data Re-programming
In case the DDC data memory IC or main EEPROM which storage all
factory settings were replaced due to a defect, the serial numbers have
to be re-programmed" Analog DDC IC, & EEPROM
It is advised to re-soldered DDC IC and main EEPROM from the old
board onto the new board if circuit board have been replaced, in this
Case the DDC data does not need to be re-programmed.
Additional information
Additional information about DDC (Display Data Channel) may be
obtained from Video Electronics Standards Association (VESA).
Extended Display Identification Data(EDID) information may be also
obtained from VESA.
System and equipment requirements
1. An i486 (or above) personal computer or compatible.
2. Microsoft operation system Windows 95/98 .
Y ou have t o Install the EDID_PORT_Tool under Win2000/XP . As
Fig. 1 .
A. Cody the "UserPort.sys" to C:\WINNT\system32\drivers(win2000)
C:\WINDOWS\system32\drivers(winXP)
B. Running " io.exe" everytime, Before you start to programming
edid data .
3. EDID45.EXE program .
4. A/D Alignment kits (3138 106 10079):
inclusion : a. Alignment box x1 (as Fig. 2)
b. Printer cable x1
c. (D-Sub) to (D-Sub) cable x1

DDC Instructions

Note: The EDID45.EXE is a windows-based program, which cannot be
Note: The alignment box has already build-in a batteries socket for
using
".
remove four screws at the rear of box. Please do not forget that
remove batteries after programming. The energy of batteries can
only drive circuits for a short period of time.
Pin assignment
A. 15-pin D-Sub Connector
B. 29-pin DVI Cable Connector
Pin
1
2
3
4
5
Fig. 1 Fig. 1
6
7
8
9
10
11
12
13
14
15
Configuration and procedure
There are threeips contained serial number on the circuit board,
Analog DDC IC (7225), Digital DDC IC (7223,7224) and main
EEPROM (7472) which storage all factory settings. Following
descriptions are the connection and procedure for Analog DDC
IC and Digital DDC IC, the main EEPROM can be re-
programmed along with Analog IC by enable factory memory
data write function on the DDC program (EDID45.EXE).
In order to avoid that monitor entering power saving mode due to
sync will cut off by alignment box, it is necessary to initialize
alignment box before running programming software (EDID45.EXE).
Following steps show you the procedures and connection.
Fig. 2 Fig. 2
Initialize alignment box
run in MS-DOS.
batteries (12V) as power source. Pull out the socket by
To Printer
DC 8V~12V
Power
indicator
To Monitor
Video Card Video Card
A/D Alignment Kits - Analog connection A/D Alignment Kits - Analog connection
A/D Alignment Kits - Digital connection A/D Alignment Kits - Digital connection
Pin
Assignment
No.
1 Red video input
2 Green video input /SOG
3 Blue video input
4 Ground
5 Cable detect
6 Red video ground
7 Green video ground
8 Blue video ground
Description
Pin
16
T.M.D.S. data2-
17
T.M.D.S. data2+
18
T.M.D.S. data2 shield
19
No Connect
20
No Connect
21
DDC clock
22
DDC data
23
Analog V-sync
24
T.M.D.S. data1-
C1
T.M.D.S. data1+
C2
T.M.D.S. data1 shield
No Connect
C3
C4
No Connect
+5V Power
C5
Gnd (for +5V) H/V sync
Pin
Assignment
No.
9 DDC +5V supply from pc
10 Sync GND
11 Ground
12 Bi-directional data
13 H. + V. Sync
14 V. Sync
15 Data clock
Description
Hot plug detect
T.M.D.S. data0 -
T.M.D.S. data0+
T.M.D.S. data0 shield
No Connect
No Connect
T.M.D.S clock shield
T.M.D.S. clock+
T.M.D.S. clock -
Analogy R
Analogy G
Analogy B
Analogy H-sync
Analogy GND (RGB return)