Check List - Dell E156FPc Service Manual

13.Check List

1) After replacing LCD Main board and panel, Check if white-balance is within the specs, then
re-writing DDC is necessary.
The white-balance value for each common color temperature:
9300 parameter is x=283±28, y=297±28, Y = 180 ±10 cd/m
6500 parameter is x =313±28, y=329±28, Y = 180 ±10 cd/m
5700 parameter is x = 328 ±28, y = 344 ±28, Y = 180 ±10 cd/m
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.
2) Steps of white-balance adjustment for LCD:(Take 17" AOC LCD LM724 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.
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.
3. 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.
4. Cut the power. Then press MENU key and re-plug power cable at the same time to enter into the factory
mode. See the following pictures.
5. Test white-balance again after Auto Level. Adjustment with hand is necessary if it is beyond the specs.
6. 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.
2
(Center). The exact brightness values are confirmed by the checking-regulations of
2
,
2
,
2
)
2
（Center）and 17" LCD is required to be
Select "F＂,then Select
AUTO LEVEL item.
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Dell E156FPc