Check List After Replacing Lcd Main Board - HP VS17E Service Manual

11. 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.
Ⅰ. Check white -balance
The white-balance value for each common color temperature:
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/cm
larger than 200cd/cm
different customers and different models.
Ⅱ. Steps of white-balance adjustment for LCD:(Take 17" HP LCD for example)
1. Required instruments: Chroma7120、Chroma2325（BGA265A） 。
2. 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.
a) Set Chroma2325 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.
b) Set Chroma2325（BGA265A）to be T144（1280*1024/60HZ）and P105 of full white screen. Test if the
white-balance value is within the specs. Please follow the steps below to adjust if it is beyond the specs.
c) Cut the power. Then press Minus ("-") key and supply power at the same time to enter into the factory mode.
See the following pictures.
2
(Center). The exact brightness values are confirmed by the checking-regulations of
2
（Center）and 17" LCD is required to be
37
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HP VS17E