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8. Alignments
Index of this chapter:
8.1 General Alignment Conditions
8.2 Hardware Alignments
8.3 Software Alignments
8.4 Option Settings
8.1
General Alignment Conditions
8.1.1
Start Conditions
Perform all electrical adjustments under the following
conditions:
•
Power supply voltage: 120 V
•
Connect the set to the AC Power 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 chassis
ground (with the exception of the voltages on the primary
side of the power supply).
Caution: It is not allowed to use heatsinks as ground.
•
Test probe: Ri > 10 Mohm, Ci < 20 pF.
•
Use an isolated trimmer/screwdriver to perform
alignments.
8.1.2
Initial Settings
Perform all electrical adjustments with the following initial
settings (via the "Active Control" button on the RC):
1. To avoid the working of the lightsensor, set ACTIVE
CONTROL to OFF.
2. Set SMART PICTURE to NATURAL/ECO.
8.1.3
Alignment Sequence
•
First, set the correct options:
–
In SAM, select (SERVICE) OPTIONS -> OPT. NO,
–
Fill in the option settings according to the set sticker
(see also paragraph "Option Settings"),
–
Select STORE OPTIONS and push OK on the remote
control,
–
After storing, the set must be restarted!
•
Warming up (>10 minutes).
•
White point alignment.
8.2
Hardware Alignments
8.2.1
Backlight Voltage Alignment
Switch the set "on" and measure the voltage between pin 1 of
connector 1304 and pin 1 of connector 1309 (ground). Align
R3026 until this voltage is 24 V
Caution: This voltage must be aligned very precisely: when it
is too high (> 27 V), it can destroy the inverters. When it is too
low (< 23 V) the backlight will not start up.
Note: The 42" models have a double PSU, therefore an extra
pot meter must be aligned: measure the voltage between pin 1
of connector 1303 and pin 1 of connector 1320 (ground). Align
R3U26 until this voltage is 24 V
/ 60 Hz (± 10%).
AC
+/- 0.1 V (for LPL displays).
DC
+/- 0.1 V.
DC
Alignments
EL1.1U
8.3
Software Alignments
Put the set in SAM mode (see the "Service Modes, Error Codes
and Fault Finding" section). The SAM menu will now appear on
the screen. Select ALIGNMENTS and go to one of the sub
menus. The alignments are explained below.
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
For the next alignments, supply the following test signals via a
video generator to the RF input: NTSC M/N TV-signal with a
signal strength of at least 1 mV and a frequency of 61.25 MHz
(channel 3).
Tuner AGC
Purpose: To keep the tuner output signal constant as the input
signal amplitude varies.
For this chassis, no alignment is necessary, as the AGC
alignment is done automatically (standard value: "32").
8.3.2
White Point
•
Set ACTIVE CONTROL to OFF.
•
In the [MENU] -> PICTURE user menu, set:
–
DYNAMIC CONTRAST to OFF.
–
COLOUR ENHANCEMENT to OFF.
–
COLOUR to "0".
–
CONTRAST to "100".
–
BRIGHTNESS to "50".
•
Go to the SAM and select ALIGNMENTS -> WHITE
POINT.
Method 1 (with color analyzer):
•
Use a 100% white screen as input signal and set the
following values:
–
COLOR TEMPERATURE: "Tint to be aligned".
–
All WHITE POINT values to: "127".
–
RED BL OFFSET value to: "7".
–
GREEN BL OFFSET value to: "5".
•
Measure with a calibrated (phosphor- independent) color
analyzer in the centre of the screen. Consequently, the
measurement needs to be done in a dark environment.
•
Adjust, by means of decreasing the value of one or two
white points, the correct x,y coordinates (see table "White
D alignment values"). Tolerance: dx,dy: ± 0.004.
•
Repeat this step for the other Color Temperatures that
need to be aligned.
•
When finished press STORE (in the SAM root menu) to
store the aligned values to the NVM.
•
Restore the initial picture settings after the alignments.
Table 8-1 White D alignment values
Color Temp.
Cool
(degr. K)
(11000)
x
0.276
y
0.282
When such equipment is not available, use "method 2".
8.
EN 121
Normal
Warm
(9100)
(6500)
0.285
0.313
0.293
0.329
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