REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Wednesday 27 March 2019

PHILIPS MATCHLINE _ 29PT9421 _ PICTURE GEOMETRY ADJUSTMENTS

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.
  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”.
Posted By: FRANK at 03:09
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