Philips FM24 Service Manual page 86

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EN 86 8.
• When a defective PDP is replaced by the same type:
This requires a new 'White Point' adjustment (see next
paragraph).
• When a defective PDP is replaced by another (newer)
type:
This requires both a new compensation table upload (by
ComPair), and a new 'White Point' adjustment (see next
paragraph).
Note: The loaded software, performs the settings
automatically.
8.3.3 Scaler
Table 8-3 SAM Menu 'Scal.'
Service Alignment Menu Scaler
Test pattern On / Off
Color temperature 6500K / 7600K / 10000K
White point Adjust ...
Align ADC Press OK to execute
Test pattern
This function makes it possible to generate a 'colour bar' test
pattern (generated by the PW Scaler IC). You can use this
picture, to check the video path, starting at the PW Scaler IC to
the plasma display.
Colour temperature
Select the appropriate colour temperature for the alignments
(see also 'White point' adjustment below).
White Point
Table 8-4 SAM Menu 'Scaler - White Point'
Service Alignment Menu
White point red <-------------|------------> 125
White point green <---------|----------------> 100
White point blue <-----------|--------------> 110
Press OK when done
Method 1 (with colour analyser)
1. Supply, via an external VGA source (e.g. a PC with
1024x768 mode, or a VGA generator), a 'White Drive' test
pattern (ask your NSO). This picture consists of black
picture with in the middle a 100% white square.
2. Set BRIGHTNESS to '53' and CONTRAST to '65' (via the
standard customer menu).
3. Go to the SAM menu.
4. Set COLOR TEMPERATURE to '7600 K'.
5. Measure with a CTV colour analyser (calibrated with the
spectra) on the centre of the white square on the screen.
6. Select 'White point' in the SAM Scaler menu, and press
CURSOR RIGHT.
7. Adjust with the CURSOR UP/DOWN or LEFT/RIGHT
command, the three white points Red, Green and Blue to
'128' (do not go above this value!), and align with one or
two of the drivers to the correct coordinates (see table).
8. Repeat the same measurement for respectively colour
temperature '6500 K' and '10000 K'.
9. Repeat again if necessary.
FM24 Alignments
Scaler - White point
Table 8-5 White Point XY-coordinates
Colour Temperature
5600 K (Cool)
7600 K (Normal)
10000 K (Warm)
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 8-6 White point RGB-values
Colour Temperature
5600 K (Cool)
7600 K (Normal)
10000 K (Warm)
Align ADC
1. Supply, via an external VGA source (e.g. a PC, mode
1024x768), the 'ADC alignment' test pattern (ask your
NSO). This picture consists of a half black and half white
picture: black is 16, and white is 235 on a full scale of 255
(=770 mV).
2. Go to the SAM menu.
3. Select 'Align ADC' in the SAM Scaler menu, and press
CURSOR RIGHT.
4. The alignment is performed automatically.
8.3.4 Video 1 (Enhanced version only)
Table 8-7 SAM Menu 'Vid. 1'
Service Alignment Menu
Test pattern
This function makes it possible to generate a 'full white' test
pattern (generated by the de-interlacer SDA9400, item 7280).
You can use this picture, to check the video path of the external
inputs AV1, 2 and 3, starting at item 7280 (the proper
functioning of the Digital Video Decoder SAA7118 is not
tested!).
Note: To generate the test pattern, it is necessary to feed a
signal to one of the AV-inputs.
Brightness
This is the setting of IC7225 (SAA7118). Not necessary to
align, fixed value is:
• PAL/SECAM:
• NTSC:
Contrast
This is the setting of IC7225 (SAA7118). Not necessary to
align, fixed value is:
• PAL/SECAM:
• NTSC:
Sharpness
Not necessary to align, fixed value is 6.
Digitized in Heiloo, Holland
x y
313 329
299 309
280 289
R G B
120 119 128
128 121 121
128 120 110
Video 1
Test pattern On / Off
Brightness 0 <-----------|---------- > 255
Contrast 0 <-----------|---------- > 255
Sharpness 0 <-----------|---------- > 255
132
139
139
128
31/8/2014