Friday, January 11, 2013

PHILIPS MATCHLINE _ 29PT9421 _ PICTURE GEOMETRY ADJUSTMENTS




PICTURE GEOMETRY

The geometry alignments menu contains several items to align the set, in order to obtain correct picture geometry.


 Click on image.  Right click on the enlarged image, save image as, to a folder.   View it in ‘Picasa’ picture viewer.  There you can enlarge it more.  Download ‘Picasa-3’ by Google site, and install it to your system.  It’s free software from Google and download it by Google. [Search for ‘Picasa’ by Google]
  1. Connect an external video pattern generator to the aerial input of the TV-set and input a crosshatch test pattern. Set the generator amplitude to at least 1 mV and set frequency to 61.25 MHz (channel 3).
  2. Set 'Smart Picture' to NATURAL (or MOVIES).
  3. Activate the SAM menu. [See previous posts for detail]
  4. Go to the GEOMETRY sub menu.
  5. Choose HORIZONTAL or VERTICAL alignment.
HORIZONTAL ADJUSTMENTS
  • Horizontal Parallelogram (HP). Align straight vertical lines in the top and the bottom; vertical rotation around the center.
  • Horizontal Bow (HB). Align straight horizontal lines in the top and the bottom; horizontal rotation around the center.
  • Horizontal Shift (HSH). Align the horizontal center of the picture to the horizontal center of the CRT.
  • East West Width (EWW). Align the picture width until the complete test pattern is visible.
  • East West Parabola (EWP). Align straight vertical lines at the sides of the screen.
  • Upper Corner Parabola (UCP). Align straight vertical lines in the upper corners of the screen.
  • Lower Corner Parabola (LCP). Align straight vertical lines in the lower corners of the screen.
  • East West Trapezium (EWT). Align straight vertical lines in the middle of the screen.
  • H60 (Delta HSH for 60Hz, if present). Align straight horizontal lines if NTSC system is used (60 Hz) i.s.o. PAL (50 Hz). Default value is “9”.
VERTICAL ALIGNMENTS
  1. Service blanking (SBL). Switch the blanking of the lower half of the screen “on” or “off” (to be used in combination with the vertical slope alignment).
  2. Vertical Shift (VSH). Align the vertical centering so that the test pattern is located vertically in the middle. Repeat the 'vertical amplitude' alignment if necessary.
  3. Vertical slope (VS). Align the vertical center of the picture to the vertical center of the CRT. This is the first of the vertical alignments to perform. For an easy alignment, set SBL to “on”.
  4. Vertical Amplitude (VAM). Align the vertical amplitude so that the complete test pattern is visible.
  5. Vertical S-Correction (VSC). Align the vertical linearity, meaning that vertical intervals of a grid pattern must be equal over the entire screen height.
  6. Vertical Zoom (VX, if present). The vertical zoom is added in for the purpose of development. It helps the designer to set proper values for the movie expand or movie(16x9) compress. Default value is “25”.
  7. V60 (Delta VAM for 60Hz, if present). Align straight vertical lines if NTSC system (60 Hz) is used i.s.o. PAL (50 Hz). Default value is “-2”.

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