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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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