Setup Input Timing; Writing Edid File; Command Definition - BenQ Q7T4-FP71G Service Manual

Q7T4-FP71G LCD Monitor Service Guide
5. Setup input timing , 32 -Gray pattern.
To check if there are any abnormal display problems of preset timing modes .
Check the following preset timings with General pattern:
No.
1
2
3
4
5
6
7
8
9
10
6. Checking if the picture is no good, reject this monitor.
7. To check the power consumption by disabling "burn-in mode" setting
8. To clear user data and program complete DDC data to monitor by IIC bus communication.
E. Writing EDID file:
1. Setup a PC with DDC card.
2. Connect PC to monitor with a D-sub signal cable.
3. Please refer to the C212 for the correct EDID file.
4. Runs the writing program to write the EDID file into EEPROM .
5. Read EEPROM data and confirm it to match with the C212 document definition.
F. Command definition :
PC Host will send 0x7C IIC slave address and then following 4 bytes command
I2C Send Command
Write Contrast to MCU RAM
Write Brightness to MCU RAM
Write Red Gain to MCU RAM
Write Green Gain to MCU RAM
Write Blue Gain to MCU RAM
Read Contrast from MCU RAM
Read Brightness from MCU RAM
Read Red Gain from MCU RAM by color index
Read Green Gain from MCU RAM by color
index
Read Blue Gain from MCU RAM by color index C3
Write C1 (Bluish) R-Gain Data to EEPROM
Write C1 (Bluish) G-Gain Data to EEPROM
Write C1 (Bluish) B-Gain Data to EEPROM
Write C2 (sRGB) R-Gain Data to EEPROM
Write C2 (sRGB) G-Gain Data to EEPROM
Write C2 (sRGB) B-Gain Data to EEPROM
Mode
720×400 @ 70Hz
640×480 @ 60Hz
640×480 @ 75Hz
800×600 @ 60Hz
800×600 @ 75Hz
1024×768 @ 60Hz
1024×768 @ 75Hz
1152x864 @ 75Hz
1280×1024 @ 60Hz
1280×1024 @ 75Hz
H
31.468
31.469
37.500
37.879
46.875
48.363
60.023
67.500
63.981
79.976
Byte1 Byte2 Byte3 Byte4
CA 55 Data cksum
CA 56 Data cksum
Data cksum
CA 57
CA 58 Data cksum
CA 59 Data cksum
C3 55 XX cksum
C3 56 XX cksum
C3 57 XX cksum
C3 58 XX cksum
59 XX cksum
AA 3C Data cksum
AA 3D Data cksum
AA 3E Data cksum
AA 4C Data cksum
AA 4D Data cksum
AA 4E Data cksum
Confidential
Alignment Procedure
V
70.8
59.940
75.000
60.317
75.000
60.004
75.029
75.000
60.020
75.025
OK N.A. Remark
√
√
Write data to MCU RAM and
√
update the related register to
√
refresh the screen immediately.
√ Don't store data to EEPROM.
√
√
√
√
Base on current color index to
√ read back the right gain value.
√
√
√
√
√
√
3