Alignments
8.
8.
Alignments
Index of this chapter:
8.1 General Alignment Conditions
8.2 Hardware Alignments
8.3 Software Alignments
8.4 Option Settings
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.
8.1
General Alignment Conditions
8.1.1
Start Conditions
Perform all electrical adjustments under the following
conditions:
•
Power supply voltage (depends on region):
–
AP-NTSC:
120 V
AC
or 230 V
AC
/ 50 Hz (
±
10%).
–
AP-PAL-multi
: 120 - 230 V
AC
/ 50 Hz (
±
10%).
–
EU
: 230 V
AC
/ 50 Hz (
±
10%).
–
LATAM-NTSC
: 120 - 230 V
AC
/ 50 Hz (
±
10%).
–
US
: 120 V
AC
/ 60 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 chassis
ground (with the exception of the voltages on the primary
side of the power supply).
Caution:
never 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".
3.
Set "Active Display" to "Off"
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-D 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
potmeter R3026 until this voltage is:
•
12 V
DC
+/- 0.1 V (for Sharp displays).
•
24 V
DC
+/- 0.1 V (for LG.Philips displays).
Caution:
This voltage must be aligned very precisely (within
10%): when it is too high, it can destroy the inverters. When it
is too low, the backlight will not start up.
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:
•
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
•
US/AP-NTSC
models: an NTSC M/N TV-signal with a
signal strength of at least 1 mV and a frequency of 61.25
MHz (channel 3).
•
LATAM
models: an NTSC M or PAL M TV-signal with a
signal strength of at least 1 mV and a frequency of 61.25
MHz (channel 3).
Luma Gain
Fixed setting of "1".
IF AFC
Alignment procedure:
1.
During the IF AFC-parameter adjustment, one can see
OSD feedback on the screen.
2.
The OSD feedback can give 4 kinds of messages:
3.
The first item ("IN/OUT") informs you whether you are in or
out of the AFC-window.
4.
The second item ("HIGH/LOW") informs you whether the
AFC-frequency is too high or too low.
Table 8-1 AFC
1.
Adjust the IF AFC parameter until the
first
value is within
the AFC window (= IN).
2.
Next, adjust the IF AFC parameter until the
second
value
is LOW.
IF Lprime AFC
Same procedure as described above, but with SECAM L/L'
signal source.
Tuner AGC
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".
AFC-window
AFC-frequency vs. reference
Out
High
In
High
[ In ]
[ Low ]
Out
Low
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