Alignments - Philips 32HF7445/93 Service Manual

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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 Electrical Alignments
8.5 Serial Number Definition
Note:
The Service Modes 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
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 Mohm, Ci < 20 pF.
• Use an isolated trimmer/screwdriver to perform
alignments.
8.2 Hardware Alignments
There are no hardware alignments foreseen for this chassis.
8.3 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.
8.3.1 RGB Alignment
Before alignment, choose "TV MENU" -> "Picture" and set:
• "Brightness" to "50".
• "Colour" to "50".
• "Contrast" to "100".
White Tone Alignment:
• Activate SAM.
• 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 (phosphor- independent) 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
or 230 V / 50 Hz (± 10%).
AC AC
/ 50 Hz (± 10%).
AC
/ 50 Hz (± 10%).
AC
Alignments TPT1.1HA LA
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 8-1 White D alignment values
Value Cool (11000 K)
x 0.278
y 0.278
If you do not have 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).
• Set the RED, GREEN and BLUE default values per
temperature according to the values in the "Tint settings"
table.
• When finished return to the SAM root menu and press
STANDBY on the RC to store the aligned values to the
NVM.
Table 8-2 Tint settings
Colour Temp. R
Cool 243
Normal 251
Warm 256
Black Level Offset Alignment
• Activate SAM.
• Select "RGB Align." -> "BlackL Offset" and choose a colour.
• Set all "BlackL Offset" values to "0".
• When finished return to the SAM root menu and press
STANDBY on the RC to store the aligned values to the
NVM.
Note: For models with "Pixel Plus", the "Black Offset" (black
level offset) should NOT be changed in SAM. These offset
values of RGB should be set to "0", and should NOT be
adjusted. Any adjustment of these values will affect the low
light white balance.
ADC YPbPr Gray Scale Alignment
When the grey scale is not correct, use this alignment:
• Activate SAM.
• Select "NVM Editor".
• Enter address "26(dec)" (ADR).
Set value (VAL) to "197(dec) ± 25".
•
• Store (STORE) the value.
8.4 Electrical Alignments
8.4.1 PC Mode Adjustment
White balance adjustment
General set-up:
Equipment Requirements: Colour analyser.
8. EN 61
Normal (9000 K) Warm (6500 K)
0.289 0.314
0.291 0.319
G B
256 249
256 220
241 189