Q7T4-FP71G LCD Monitor Service Guide
Alignment Procedure
3
Confidential
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. Mode H V
1 720×400 @ 70Hz 31.468 70.8
2 640×480 @ 60Hz 31.469 59.940
3 640×480 @ 75Hz 37.500 75.000
4 800×600 @ 60Hz 37.879 60.317
5 800×600 @ 75Hz 46.875 75.000
6 1024×768 @ 60Hz 48.363 60.004
7 1024×768 @ 75Hz 60.023 75.029
8 1152x864 @ 75Hz 67.500 75.000
9 1280×1024 @ 60Hz 63.981 60.020
10 1280×1024 @ 75Hz 79.976 75.025
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
Byte1 Byte2 Byte3
Byte4
OK N.A.
Remark
Write Contrast to MCU RAM CA 55 Data cksum
√
Write Brightness to MCU RAM CA 56 Data cksum
√
Write Red Gain to MCU RAM CA 57 Data
cksum
√
Write Green Gain to MCU RAM CA 58 Data cksum
√
Write Blue Gain to MCU RAM CA 59 Data cksum
√
Write data to MCU RAM and
update the related register to
refresh the screen immediately.
Don’t store data to EEPROM.
Read Contrast from MCU RAM C3 55 XX cksum
√
Read Brightness from MCU RAM C3 56 XX cksum
√
Read Red Gain from MCU RAM by color index C3 57 XX cksum
√
Read Green Gain from MCU RAM by color
index C3 58 XX cksum
√
Read Blue Gain from MCU RAM by color index C3 59 XX cksum
√
Base on current color index to
read back the right gain value.
Write C1 (Bluish) R-Gain Data to EEPROM AA 3C Data cksum
√
Write C1 (Bluish) G-Gain Data to EEPROM AA 3D Data cksum
√
Write C1 (Bluish) B-Gain Data to EEPROM AA 3E Data cksum
√
Write C2 (sRGB) R-Gain Data to EEPROM AA 4C Data cksum
√
Write C2 (sRGB) G-Gain Data to EEPROM AA 4D Data cksum
√
Write C2 (sRGB) B-Gain Data to EEPROM AA 4E Data cksum
√
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