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 February 2019

HOW TO REPAIR VIDEO OUTPUT SECTION TO SONY WEGA [KV-HA AND KW-HA] SEIRES TVs


HOW TO REPAIR VIDEO OUTPUT SECTION TO SONY WEGA [KV-HA AND KW-HA] SEIRES TVs

NO PICTURE; SOUND OK; BLACK SCREEN - Troubleshooting

Check the voltages at CRG socket pins [8. 9 & 10].  If these voltages are found high (almost equal to video output supply voltage 200VDC], the chroma IC should be suspected.  Check the voltages at pins 1,2&3 of CN703.  These are the red, green and blue color information comes from the main board.  There must be a voltage equal to [2.5VDC].  This voltage will vary according to the video information.  If this voltage is high, you will get a full white raster with vertical retrace lines all along the screen. if the volte is very low, or no voltage at all, a full black screen will be the result.  Never consider this as a simple and easy to do work, as it needs so many checks at various points. 

If there is no voltage at these points, or very low voltage than normal; say about 0.03VDC  or so, go to chroma section at the main A board, and check the voltages at the pins of the chroma IC.  Chroma IC used here in these models are [TDA 8844 N2].