CHECK LIST AFTER MAIN BOARD REPLACEMENT {Click on images to Enlarge]
Check if white-balance is within the specs after replacing
Main board and panel,then re-writing DDC is necessary.
- Check white -balance
9300K: x=283±20 ; y = 297±20;
sRGB: x = 313±20 ; y = 329 ±20;
The color temperature value above must be up to the
situation of x<y. The value of Y should be confirmed according to different
customers. 15 ”LCD is commonly 180±20cd/cm2
Center and 17” LCD is required to be larger than 200cd/cm2 (Center).
The exact brightness values are confirmed by the
checking-regulations of different
customers and different models.
Steps of white-balance adjustment for LCD:(Take 19” HP LCD
for example)
- Required instruments: Chroma7120 Chroma2325 BGA265A
- First connect the instruments together and turn on the LCD power, then warm up for 30 minutes under full white screen mode. First press the “Reset” key in the menu to recover factory set as following.
- Set Chroma 2325 at round-windows mode and make the detecting-head of Chroma7120 aim at the cross in the middle, the distance between the detecting-head and the cross is 20cm.
- Set Chroma 2325 BGA265A to be T144 1280*1024/60HZ and P105 of full white screen. Test if the white-balance value is within the specs. Follow the steps below to adjust if it is beyond the specs.
- Cut the power. Then press Minus (“-“) key and supply power at the same time to enter into the factory mode.
- Test white-balance again after Auto Level. Adjustment with hand is necessary if it is beyond the specs just the same.
- Select 7x00 item to adjust cool color-temperature and select 6x00 to adjust warm color- temperature. It can reach to the best effect through adjusting R/G/B value if it inclines to green or blue.
- Select Exit to the upper menu after completing the adjustment. Then press POWER OFF to exit and save it.
DDC WRITING
- Employ PC, and connect the DDC-writing instrument and the instrument that is ready for writing into DDC to the power of 12v. Connect the signal cable of the latter to D-USB or DVI of DDC-writing instrument (The data-writing of monitor needs transfer-interface) and link the DDC-writing instrument with PC through printer interface.
- Seek the document with the expanded name of .BAT inDDC file of this model. It appears the indication of “Input Serial No. - - after dual-click the document to be ready for DDC-writing.
- Input the serial number of the product (For instance: AOC LM729 is 13 bits), then press ENTER to start writing
- Check the indication of DDC-writing program at the end. When you see the picture as the schematic picture above, the “Data compare OK!” means being written well and that’s the end. Check if the Manufacturer Name, Vendor Assigned Code, Monitor Name, Serial Number, Week of Manufacture, Year of Manufacture are right. It will appear “Data compare error ” to indicate failure if the DDC-writing doesn’t perform well. Check the power resource and the connection of the signal cable, then return to step 3 by pressing ENTER and re-do it.
- You can exit the program by pressing Ctrl plus C, then cut the signal cable and the power.
- Make sure the system time of PC is in accordance with the real time before writing.
- The schematic picture is just as an example for description; the exact content of the DDC is dependent on the serial number of the BARCORD of this model.
- Data DDC-writing needs a transfer interface.
InstructionDDC-writing needs 4 files:
- Barcode.txt (Supply Barcode length and flow number)
- *.EXE (DDC-writing program)
- WR.bat (Group order file for cycling utilization of *EXE, and dual-click this file when perform DDC-writing)
- w.dat The content with 128 bits of DDC
EDID CONTENT
