HP L1940T
37
14. Check List after replacing LCD Main board
Check if white-balance is within the specs after replacing Main board and panel, then re-writing DDC is necessary.
14.1 Check white-balance
The white-balance value for each common color temperature:
9300 º K: x=283± 20 ; y = 297± 20;
6500K: x = 313± 20 ; y = 329 ± 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/cm
2
（Center）and 17” LCD is required to be
larger than 200cd/cm
2
(Center). The exact brightness values are confirmed by the checking-regulations of
different customers and different models.
14.2 Steps for writing DDC：
Re-programming Analog DDC IC
Step 1: After initialize alignment box, connecting all cables and box as shown in Fig. 10.
Step 2: Read DDC data from monitor
1. Click
icon as shown in Fig. 11 from the tool bar to bring up the Channels "Configuration Setup" windows as
shown in Fig. 11.
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