Philips 42PF9945 Service Manual page 31

EN 90 8.
Notes:
•
All changes must be stored manually.
•
If an empty EAROM (permanent memory) is detected, all
settings are set to pre-programmed default values.
8.3.1
GENERAL
LUMA GAIN
Fixed setting of "2".
IF AFC
Supply, via a service generator or via off-air, a PAL B/G TV-
signal with a signal strength of at least 1 mV and a frequency
of 475.25 MHz. Alignment procedure:
1. During the IF AFC-parameter adjustment, one can see
OSD feedback on the screen.
2. The OSD feedback at the top of the screen can give 4 kinds
of messages:
1. The first item (IN/OUT) informs you whether you are in
or out of the AFC-window.
2. The second item (HIGH/LOW) informs you whether the
AFC-frequency is too high or too low.
3. Adjust the IF AFC parameter until the first value is
within the AFC window (= IN).
4. Next, adjust the IF AFC parameter until the second
value is LOW.
Table 8-1 AFC OSD feedback of AFC alignment
AFC-window AFC-frequency vs. reference
Out
In
[ In ]
Out
IF LPRIME AFC
Same procedure as described above, but with other signal
source (SECAM L').
TUNER AGC
1. Connect the RF output of a video pattern generator to the
antenna input.
2. From the generator, input a PAL B/G TV signal with a
signal strength of approximately 2 mV and a frequency of
475.25 MHz.
3. Measure the DC voltage on pin 1 of the (main) Tuner. You
can adjust this voltage by adjusting the TUNER AGC item
in the SAM menu. Alignment is correct when the DC
voltage is just below 3.5 V.
BLEND INTENSITY
Use this alignment when you replace the microcontroller, NVM,
or the EBILD. It aligns the level of transparency of the menu-
picture blended into the main-picture. Fixed setting of "16".
FBX TESTPATTERN
This function makes it possible to generate a test pattern
varying from full black to full white in eight steps. You can use
this pattern to check the video path, starting at the FBX to the
plasma display. The pattern is generated by the Eagle (IC7724)
for PixelPlus sets, or by the PICNIC (IC7713) for non-PixelPlus
sets.
Note: This test pattern can also be very useful for checking the
display for pixel failures.
8.3.2
2FH ADC ALIGNMENT
Only necessary to align, when the EPLD or NVM is replaced.
Use the default values as mentioned in the table.
FTP1.1E Electrical Alignments
High
High
[ Low ]
Low
Table 8-2 2fH ADC alignment
Menu item
RED GAIN RGB
BLUE GAIN RGB
GREEN GAIN RGB
RED OFFSET RGB
BLUE OFFSET RGB
GREEN OFFSET RGB
RED GAIN YPBPR
BLUE GAIN YPBPR
GREEN GAIN YPBPR
RED OFFSET YPBPR
BLUE OFFSET YPBPR
GREEN OFFSET YPBPR 46
8.3.3
White point alignment
Table 8-3 Default values white point alignment.
Menu item Alignment value
Test Pattern NO / YES (no function)
WhitePointRed 127 (depends on color temperature)
WhitePointGreen 127 (depends on color temperature)
WhitePointBlue 127 (depends on color temperature)
Red BL offset 7
Green BL offset 7
Color Temperature NORMAL / WARM / COOL
Ignore "Test Pattern" item in the alignment menu, this is not
implemented.
Method 1 (with colour analyser)
1. Supply, via an external VGA source (e.g. a PC with
640x480 mode, or a VGA generator), a 'White Drive' test
pattern (ask your NSO). This picture consists of a black
picture with in the middle a 100% white square.
2. Select the color temperature to adjust (default NORMAL).
3. Measure with a CTV colour analyser (calibrated with the
spectra) on the centre of the white square on the screen.
4. Adjust with the CURSOR UP/DOWN or LEFT/RIGHT
command, the three white points Red, Green and Blue.
Max. value is 127. Align with one or two of the drivers to
the correct coordinates (see table of color coordinates).
5. Repeat the same measurement for respectively colour
temperature WARM and COOL.
Table 8-4 Color coordinates
Color Temperature
6500 Warm
9400 Normal
11500 Cool
Method 2 (without colour analyser)
Without a CTV colour analyser, it is possible to set some
parameters, which are based on average values from
production.
Table 8-5 Color temperature RGB values
Color Temperature
6500 Warm
9400 Normal
11500 Cool
Alignment value
111
117
157
59
52
46
111
117
137 ("GREEN GAIN RGB" minus
"20" )
59
52
x y
0.313 0.329
0.285 0.290
0.269 0.289
R G B
127 119 107
127 122 124
119 125 127