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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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday 20 March 2019

SONY KL-W7000 - KL-W9000 - LCD REAR PROJECTION TVs - WORKING PRINCPLE [HOW LCD REAR PROJECTION TVS WORKS]

SONY KL-W7000 - KL-W9000 - LCD REAR PROJECTION TVs - WORKING PRINCPLE [HOW LCD REAR PROJECTION TVs WORKS]




The main difference between the LCD rear projection system and the standard tube type rear projection television is the use of LCDs instead of picture tubes. Instead of using three tubes this system uses three LCDs. Since there are no picture tubes, there is no High Voltage, deflection, sub deflection or tube biasing circuits. These are replaced with a High Intensity Discharge (HID) Lamp and a timing generator for the three LCDs.
ONE PIECE LIGHT ENGINE
  The HID Lamp and LCDs are used in conjunction with a dichroic prism and various lens assemblies to form the one-piece light engine. The engine works when light is emitted from the HID Lamp. The HID Lamp emits light when the Power Lamp Block applies 25kV to it. The HID Lamp works by using the 25kV to create a short arc that creates an even, uniform white light which contains color components across the spectrum of light.
  The light is sent through a lens array that separates the light into its various colors. This light is sent through a series of one-way mirrors that pass or reflect only specific colors of light. These colors are red, green and blue. These mirrors work to deliver only red, green and blue light to the LCD for that color.
  After the light passes through the three LCDs, it is sent through a dichroic prism. The dichroic prism takes the three colors of light and recombines them. The recombined colors now contain the picture due to the manipulation of the crystals inside each of the LCDs. This picture is sent through a focusing lens. The focusing lens keeps the picture focused on a mirror.  The mirror is used to reflect the picture onto the fresnel and lenticular screens. These screens are similar to the screens used in standard rear projection televisions.