Philips 170B4BB, Service Manual

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Fig. 21
- select 6500K R G B.
- select value of R or G or B
- decrease or increase
the value of 6500K R G B.
- confirm/save the value change.
- Adjust the colour temperature of 6500K of R,G,B to x,y value
as below.
R (as shown in Fig. 18), (for example, production value of R is 255)
G (as shown in Fig. 18), (for example, production value of G is 249)
B (as shown in Fig. 18), (for example, production value of B is 225)
x (center) = 0.312+/- 0.005
y (center) = 0.338 +/- 0.005
Luminance (Y) : above 380 Nits in the center of
the screen.
(experience: the value of "Y" too low, increase the value of "y" firstly.)
(experience: the value of "y" too high, decrease the value of "G".
the value of "x" too low, decrease the value of "R".)
6500K : As shown in Fig. 18 & 20.
Value of 6500K R G B.
Full white, Geometry, Gray scale & Pixel on/off pattern check 64
- Provides the full white pattern by Chroma 2250.
- Check the image of each timing (total: 29 timings) to see if there is
any colour's difference on the screen.
For instance :
at timing 60K/64Hz 1024x768 --> as shown in Fig. 20.
Full White pattern check by eye :
- Provides the cross-hatch pattern by Chroma 2250.
- Check the geometry of each timing to adjust the
geometry of image to optimal position.
For instance :
at timing 60K/64Hz 1024x768 --> as shown in Fig. 21.
Geometry check and setting by eye :
(total: 29 timings)
- Provides the 64 gray scale pattern by Chroma 2250.
- Check the image of each timing to see if all the
black and white scale are visible on the screen or not.
For instance :
at timing 60K/64Hz 1024x768 --> as shown in Fig. 22.
32 Gray Scale pattern check by eye :
(total: 29 timings)
- Provides the cross talk pattern by Chroma 2250.
- Check the image of each timing to see if there is
any Clock or/and Phase phenomenon on the screen.
For instance :
at timing 60K/64Hz 1024x768 --> as shown in Fig. 23.
Pixel on/off pattern check by eye :
(total: 29 timings)
Fig. 22
Fig. 23
Fig. 20
170B4&S4
CA110 Application (Continued)