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.

How to use the site:

- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

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 !

Friday, 8 February 2019

HOW TO CHECK A PICTURE TUBE

HOW TO CHECK A PICTURE TUBE

  It is very easy to check the emission of the cathodes of a color picture tube. Assuming all other circuit functions right, including LOT [Line output Transformer] and video output section. There is proper screen voltage; focus voltage and EHT [Extra High Tension].
      Locate the three cathode points on the base card, usually marked as Gk, Bk and Rk. Keep the brightness, contrast and color control to zero position. Take a wire of suitable length, say 50cms or so tie or clip its one end to TVs chassis [negative]. Take one resistor of value 100K 1W, tie its one end to the wire, thus one end of this resistor is now connected to negative chassis with wire and the other end of it is free now.
      Hold this resistor with some electrically nonconductive material [using hand gloves will be better]; switch on the TV, wait a minute or so to get it warm up. Just make an intermittent touch at each cathode of the picture tube base card soldering.
     For each intermittent touch will give you a color flash at screen of the respective cathode. For example, when you touch on the Rk cathode, will give a red color flash on the screen. Similar effect will give for the other two cathodes.  If any one does not get the respective color flash on the screen, check the CRT base-connecting socket for any fault with its contacts to the picture tube pin first.  Replace the CRT base socket is recommended before confirming the fault.
    Never hold it for long duration of time. Only intermittent touch should be done. This process can be used for checking cathode emission of any type of Cathode Ray Picture tubes