Alignments
6.
6.
Alignments
Index of this chapter:
6.1 General Alignment Conditions
6.2 Hardware Alignments
6.3 Software Alignments
6.4 Option Settings
6.5 Reset of Repaired SSB
Note:
The Service Default Mode (SDM) and Service Alignment
Mode (SAM) are described in chapter 5. Menu navigation is
done with the CURSOR UP, DOWN, LEFT or RIGHT keys of
the remote control transmitter.
6.1
General Alignment Conditions
Perform all electrical adjustments under the following
conditions:
•
Power supply voltage: 230 V
AC
/ 50 Hz (
±
10%).
•
Connect the set to the mains via an isolation transformer
with low internal resistance.
•
Allow the set to warm up for approximately 15 minutes.
•
Measure voltages and waveforms in relation to correct
ground (e.g. measure audio signals in relation to
AUDIO_GND).
Caution:
It is not allowed to use heatsinks as ground.
•
Test probe: Ri > 10 MW, Ci < 20 pF.
•
Use an isolated trimmer/screwdriver to perform
alignments.
6.2
Hardware Alignments
Not applicable.
6.3
Software Alignments
Put the set in SAM mode (see chapter
). The SAM menu will now appear on
the screen. Select ALIGNMENTS and go to one of the sub
menus. The alignments are explained below.
The following item can be aligned:
•
Whitepoint.
To store the data:
•
Press OK on the RC
before
the cursor is moved to the left.
•
In main menu select “Store” and press OK on the RC.
•
Press MENU on the RC to switch back to the main menu.
•
Switch the set to stand-by mode.
For the next alignments, supply the following test signals via a
video generator to the RF input:
•
EU/AP-PAL
models: a PAL B/G TV-signal with a signal
strength of at least 1 mV and a frequency of 475.25 MHz
•
DVB-T models: see table
.
6.3.1
White Point
•
Set “Active control” to “Off”.
•
Choose “TV menu”, “TV Settings” and then “Picture” and
set picture settings as follows:
•
Go to the SAM and select “Alignments”-> “White point”.
White point alignment LCD screens:
•
Use a 100% white screen as input signal and set the
following values (in SAM mode):
–
“Colour temperature” to “Cool”.
–
“Whitepoint red”, “Whitepoint green”, and “Whitepoint
blue” values to “127”.
–
“Red BL offset” and “Green BL offset” values to “8”.
With a colour analyser:
•
Measure with a calibrated, contactless (max. 25 mm
distance) colour analyser in the centre of the screen.
Consequently, the measurement needs to be done in a
dark environment.
•
Adjust
one
or
two
registers (so holding one of the White
point registers R, G or B on 127) to obtain the “Cool” x,y
values (see table
). Tolerance:
dx:
±
0.004, dy:
±
0.004.
•
Repeat this step for the “Normal” and “Warm” colour
temperatures.
•
When finished press “OK” on the RC and then press
“Store” (in the SAM root menu) to store the aligned values
into the NVM.
•
Restore the initial picture settings after the alignments.
Table 6-1 White D alignment values
Without a colour analyser,
you can use the default values.
This is the next best solution. The default values are average
values coming from production (statistics).
•
Select a “Colour Temperature” (e.g. “Cool”, “Normal”, or
“Warm”).
•
Set the “Whitepoint Red”, “- Green” and “- Blue” default
values according to the values in the “Tint settings” table.
•
When finished press “OK” on the RC, then press “Store” (in
the SAM root menu) to store the aligned values into the
NVM.
•
Restore the initial picture settings after the alignments.
Table 6-2 Tint settings
Picture Setting
Dynamic backlight
Off
Dynamic Contrast
Off
Colour Enhancement
Off
Picture Format
Unscaled
Light Sensor
Off
Brightness
50
Colour
0
Contrast
100
Value
Cool (11000 K)
Normal (9000
K)
Warm (6500 K)
x
0.278
0.289
0.314
y
0.278
0.291
0.319
Colour Temp.
R
G
B
26-inch
Cool
?
?
?
Normal
?
?
?
Warm
?
?
?
32
-inch
Cool
123
116
127
Normal
127
115
109
Warm
127
105
73
37-inch
Cool
127
109
121
Normal
127
107
105
Warm
127
100
71
42-inch
Cool
127
105
121
Normal
127
98
99
Warm
127
85
63
Picture Setting
