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Alignments

EN 20

TCM3.1A LA

2010-Jun-25

Alignments

Index of this chapter:

6.1 General Alignment Conditions
6.2 Hardware Alignments
6.3 Software Alignments
6.4 Option Settings
6.5 Reset of Repaired SSB

6.1

General Alignment Conditions

Perform all electrical adjustments under the following
conditions:
•

Power supply voltage (depends on region):
–

AP-NTSC:

120 VAC or 230 V

/ 50 Hz (

10%).

–

AP-PAL-multi:

120 - 230 V

/ 50 Hz (

10%).

–

EU:

230 V

/ 50 Hz (

10%).

–

LATAM-NTSC:

120 - 230 V

/ 50 Hz (

10%).

–

US:

120 V

/ 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 heat sinks as ground.

•

Test probe: Ri > 10 M

, Ci < 20 pF.

•

Use an isolated trimmer/screwdriver to perform
alignments.

6.1.1

Alignment Sequence

•

First, set the correct options: see also section

Option codes

•

Warming up (>15 minutes).

•

Start the alignments.

6.2

Hardware Alignments

Not applicable.

6.3

Software Alignments

Put the set in SAM mode (see chapter 5. Service Modes, Error
Codes, and Fault Finding). The SAM menu will now appear on
the screen. Select the appropriate alignment and go to one of
the sub menus with the “arrow right” button. The alignments are
explained below.
The following items can be aligned:
•

Tuner AGC.

•

White point.

•

ADC calibration of VGA and YPbPr inputs.

To store the data:
•

When displayed, select “Store” in the related sub menu and
press the “OK” button on the RC. Screen text will change
from “DO” to “OK”

•

Press the MENU/House button on the RC.

•

Switch the set to Stand-by mode.

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 TV-signal with a signal

strength of at least 1 mV and a frequency of 61.25 MHz
(channel 3).

6.3.1

Tuner AGC (RF AGC Take Over Point Adjustment)

Purpose:

To keep the tuner output signal constant as the input

signal amplitude varies.

The AGC alignment is done automatically (standard value:
“12”). Store settings and exit SAM

6.3.2

White Point

•

Press the “Menu/Home” button on the RC, and then select
“Picture”. Set the picture settings as follows:

•

Activate SAM mode and select “RGB Align”.

White point alignment LCD screens:

•

Use a 100% white screen on HDMI-1 as input signal and
set the following values:
–

“Colour temperature”: “Cool”.

–

All “R/G/B_Gain” values to: “127”.

–

All “R/G/B_Offset” values to: “240”.

In case colour analyser can be used:

•

Measure with a calibrated contactless colour analyser in
the centre of the screen. Consequently, the measurement
needs to be done in a dark environment.

•

Adjust the correct x,y coordinates by means of decreasing
the value of one or two other white points to the correct x,y
coordinates (see

Table 6-1

). Tolerance dx, dy:

0.004.

Only the “Cool” colour temperature needs to adjust.

•

When finished, select “Store” in the “RGB Align” sub menu,
and press “OK” on the RC to store the aligned values to the
NVM.

•

Restore the initial picture settings after the alignments.

Table 6-1 White D alignment values

In case no colour analyser is available