Alignments - Philips JL2.1E Service Manual

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
– AP-PAL-multi: 120 - 230 V
– EU: 230 V / 50 Hz (± 10%).
AC
– LATAM-NTSC: 120 - 230 V
– US: 120 V / 60 Hz (± 10%).
AC
• 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 OPTIONS -> OPTION NUMBERS,
– Fill in the option settings according to the set sticker
(see also paragraph "Option Settings"),
– Select STORE, push CURSOR RIGHT and OK on the
remote control, The display will show the message
"Store completed".
– After storing, the set must be restarted!
• Warming up (>10 minutes).
• White-D alignment.
or 230 V / 50 Hz (± 10%).
AC AC
/ 50 Hz (± 10%).
AC
/ 50 Hz (± 10%).
AC
Alignments JL2.1E AA
8.2 Hardware Alignments
8.2.1 Backlight Voltage Alignment
Switch the TV "on" and measure (on the LCD Supply panel) the
voltage between MP1 and MP2 (ground) as mentioned in the
table. Align the mentioned potmeter until the correct voltage is
measured.
Table 8-1 Backlight alignment values
Model MP1
(conn.-pin) (conn.-pin)
32" 1304-1/2 1309-1/2/3
37" 1304-3/4 1309-1/2/3
42" 1304-3/4 1309-1/2/3 11.8V (+/- 0.1V)
1303-1/2 1320-1/2/3 24.5V (+/- 0.1V)
Caution: This voltage must be aligned very precisely. When it
is too high, it can destroy the inverters, but 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.
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).
8.3.1 General
IF PLL Offset
Purpose: To minimise crosstalk of video into sound.
Default value: "32".
In case the default value gives problems, use the next method:
1. Set the video generator to a crosshatch test pattern (no
sound) and a RF amplitude of 10 mV.
2. Select the channel with the test picture.
3. Listen to the audio on the loudspeakers.
4. Align the value to get minimum noise in the sound.
IF PLL Offset 2nd Tuner
Use the same procedure as described above with the set
switched to the DW source.
8. EN 195
MP2 Voltage Potmeter
(tolerance)
12V (+/- 0.1V) 3026
12V (+/- 0.1V) 3026
3026
3U26