Philips LC8.1E Service Manual Download

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Alignments

EN 55

LC8.1E LB

Alignments

Index of this chapter:

8.1 General Alignment Conditions
8.2 Hardware Alignments
8.3 Software Alignments
8.4 Option Settings

Note:

Figures below can deviate slightly from the actual

situation, due to the different set executions.

General:

The Service Alignment Mode (SAM) is 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 VAC or 230 VAC / 50 Hz (

10%).

–

AP-PAL-multi: 120 - 230 VAC / 50 Hz (

10%).

–

EU: 230 VAC / 50 Hz (

10%).

–

LATAM-NTSC: 120 - 230 VAC / 50 Hz (

10%).

–

US: 120 VAC / 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 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,
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.

Table 8-1 DC voltages

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

Tuner Adjustment (RF AGC Take Over Point)

Purpose:

To keep the tuner output signal constant as the input

signal amplitude varies.
The LC8.1E LB chassis comes with the UV1316E analogue
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 multimeter and RF
generator):
•

Apply a 70 dB (1mv) RF signal with a Philips standard
circuit pattern to antenna input.

•

Adjust AGC (via SAM menu: TUNER -> AGC), until voltage
on pin 1 is 3.3 +0.5/-1.0 V.

•

Store settings and exit SAM.

8.3.2

RGB Alignment

In RGB Alignment menu there are three items White Tone,
ADC Gain & Align ADC to perform the colour temperature
alignment for the RF and the input source calibration.
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 “255”.

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
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 8-2 White D alignment values

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.