Alignments - Philips LC8.2HA LA Service Manual

EN 26 6. LC8.2HA LA

6. Alignments

Index of this chapter:
6.1 General Alignment Conditions
6.2 Hardware Alignments
6.3 Software Alignments
6.4 Option Settings
Note: Figures below can deviate slightly from the actual
situation, due to the different set executions.
General: 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 (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 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 MΩ, Ci < 20 pF.
• Use an isolated trimmer/screwdriver to perform
alignments.
6.2 Hardware Alignments
There are no hardware alignments foreseen for this chassis,
but below find an overview of the most important DC voltages
on the SSB. These can be used for checking proper functioning
of the DC/DC converters.
Test
Description Point
+12V_DISP FP12
+VTUN FP11
+3V3_STBY FP10
+3V3+SW FP20
+1V2_SW FP24
+5V_SW FQ05
+1V8_SW FQ06
+2V5_SW FQ03
+5V_IF F129
+5VS F131
+5V_TUN F146
+1V2_ADC FC04
+1V2_PLL FC05
+1V2_CORE FC06
+2V5_VDDM FD01
Q
+VDISP FR10
+8V F401
2009-Apr-10
Alignments
or 230 V / 50 Hz (± 10%).
AC AC
/ 50 Hz (± 10%).
AC
/ 50 Hz (± 10%).
AC
Specifications
(V)
Min. Typ. Max. Diagram
11.4 12.0 12.6 B01A_DC-DC
30 33 36 B01A_DC-DC
3.20 3.30 3.40 B01A_DC-DC
3.13 3.3 3.46 B01A_DC-DC
1.18 1.25 1.31 B01A_DC-DC
4.85 5.10 5.35 B01B_DC-DC
1.72 1.82 5.25 B01B_DC-DC
2.38 2.5 2.62 B01B_DC-DC
4.75 5 5.25 B02_TUNER_IF
4.75 5 5.25 B02_TUNER_IF
4.75 5 5.25 B02_TUNER_IF
1.14 1.2 1.26 B04A_TRIDENT
1.14 1.2 1.26 B04A_TRIDENT
1.14 1.2 1.26 B04A_TRIDENT
2.38 2.5 2.62 B04B_DDR
11.4 12.0 12.6 B04E_LVDS
7.60 8.00 8.40 B05A_AUDIOPR
OCESSOR
6.3 Software Alignments
With the software alignments of the Service Alignment Mode
(SAM) the Tuner and RGB settings can be aligned.
To store the data: Use the RC button "Menu" to switch to the
main menu and next, switch to "Stand-by" mode.
6.3.1 Tuner Adjustment (RF AGC Take Over Point)
Purpose: To keep the tuner output signal constant as the input
signal amplitude varies.
This chassis comes with the UV13x6(x) tuner. No alignment is
necessary, as the AGC alignment is done automatically
(standard value: "15"). However in case of problems use the
following method (use multi meter and RF generator):
• Apply a vision IF carrier of 38.9 (China: 38.0) MHz
(105 dBμV = 178 mVrms) to test point F143 (input via 50 Ω
coaxial cable terminated with an RC network of series
10 nF with 120 Ω to ground).
• Measure voltage on test point F116 with a FET probe.
• Adjust AGC (via SAM menu: TUNER -> AGC), until voltage
on test point F116 is 3.3 +0.5/-1.0 V.
• Store settings and quit SAM.
6.3.2 RGB Alignment
• Set "Active control" to "Off" (if present).
• Choose "TV menu", "Picture" and set picture settings as
follows:
Picture Setting
Brightness
Colour
Contrast
Tint (for NTSC)
White Tone Alignment:
• Activate SAM mode.
• Select "RGB Align." -> "White Tone" and choose a colour
temperature.
• Use a 100% white screen as input signal and set the
following values:
– All "White point" values initial to "256".
– All "BlackL Offset" values to "0".
In case you have a colour analyser:
• Measure with a calibrated contact less colour analyser
(e.g. Minolta CA-210) in the centre of the screen.
Consequently, the measurement needs to be done in a
dark environment.
• Adjust the correct x, y coordinates (while holding one of the
White point registers R, G or B on "256") by means of
decreasing the value of one or two other white points to the
correct x, y coordinates (see table "White D alignment
values"). Tolerance: dx: ± 0.004, dy: ± 0.004.
• Repeat this step for the other colour Temperatures that
need to be aligned.
• When finished return to the SAM root menu and press
STANDBY on the RC to store the aligned values to the
NVM.
Table 6-1 White D alignment values
Value Cool (11000 K)
x 0.278
y 0.278
50
50
100
0
Normal (9000 K) Warm (6500 K)
0.289 0.314
0.291 0.319