Philips 28PW9618, Руководство по обслуживанию

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Electrical Alignments
EN 124 EM6E 8.
V. SHIFT AND V. AMPLITUDE (vertical alignment)
Aligns the vertical centre and height of the picture.
1.
Use V. AMPLITUDE to align the vertical amplitude so that
the entire test pattern is visible.
2.
Set V. SHIFT to a value of 32.
3.
Connect a voltmeter (V_dc) between R3642 and "hot"
ground.
4.
Adjust the DC voltage to 0 with potmeter R3642 (see figure
"Top view LSP").
5.
Use V. SHIFT again to align the test pattern roughly
vertically in the middle of the screen.
6.
Repeat the alignment if necessary.
V. S-CORRECTION
Aligns for equal size squares on the top, middle, and bottom of
the picture tube.
•
Align V. S-CORRECTION so that the squares at the top (or
bottom) of the picture are the same height as the squares
in the middle of the picture.
H. SHIFT AND H. AMPLITUDE (horizontal alignment)
1.
Use H. AMPLITUDE to align the horizontal amplitude so
that the entire test pattern is visible.
2.
Use H. SHIFT to align the picture horizontally in the middle.
3.
Repeat the H. AMPLITUDE alignment if necessary.
Note: If the horizontal linearity in wide-screen mode is out of
tolerance, add a "DC-shift correction" panel (3104 328 06230)
to connector 1419 of the DAF-panel [diagram I]. On the DC-
shift panel, cut diode 6433 for correction to the right or diode
6432 for correction to the left.
Caution: Be sure to switch the set "off" first. Never plug in
"not aligned" DC-shift module in a working TV-set!
EAST/WEST ALIGNMENT
1.
Use EAST/WEST PARABOLA to align the vertical lines
until they are straight.
2.
Use UPPER EAST/WEST CORNER to align the vertical
lines in the upper corners of the screen until they are
straight.
3.
Use LOWER EAST/WEST CORNER to align the vertical
lines in the lower corners of the screen until they are
straight.
4.
Use EAST/WEST TRAPEZIUM to align for a rectangular
picture.
5.
Use HORIZONTAL BOW to correct the E/W parabola so
that it is symmetrical.
6.
Use HORIZONTAL PARALLELOGRAM to align for straight
vertical lines if necessary.
Repeat steps 1 to 6 if necessary.
8.3.5
GEO-4:3
"Geo-4:3" stands for 4:3 geometry alignment in 16:9 sets and
is aligned in Pixel Plus mode (at 75 Hz).
1.
Use EAST/WEST PARABOLA to align the vertical lines
until they are straight.
2.
Use UPPER EAST/WEST CORNER to align the vertical
lines in the upper corners of the screen until they are
straight.
3.
Use LOWER EAST/WEST CORNER to align the vertical
lines in the lower corners of the screen until they are
straight.
8.3.6
GEO-SW
"Geo-SW" stands for Super Wide geometry alignment in 16:9
sets and is aligned in Pixel Plus (at 75 Hz).
You only need to set the following values (if the normal
geometry alignment has been performed correctly):
1.
V. S-CORRECTION, enter the value of the normal
geometry alignment.
2.
H. AMPLITUDE, enter the value of the normal geometry
alignment subtracted by 1.
3.
EAST/WEST PARABOLA, enter the value of the normal
geometry alignment.
8.3.7
GEO-100Hz
"Geo-100Hz" stands for 100 Hz alignment in 16:9 sets and is
aligned in Digital Scan mode (at 100 Hz).
•
Align the picture height to the correct amplitude
requirements.
8.4
Option Settings
8.4.1
Introduction
The microprocessor communicates with a large number of I2C
ICs in the set. To ensure good communication and to make
digital diagnosis possible, the microprocessor has to know
which ICs to address. The presence / absence of these specific
ICs (or functions) is made known by the option codes.
Notes:
•
After changing the option(s), save them with the STORE
command.
•
The new option setting is only active after the TV is
switched "off" and "on" again with the Mains switch (the
EAROM is then read again).
8.4.2
SERVICE OPTIONS
Select this sub menu to set the initialisation codes (options) of
the set via text menus.