I have a Samsung TXJ2879 TV regular 10 year old cathode ray tube that after a few minutes the sides of the picture come in and the picture starts looking like an hour-glass shape. If I bang on the outside of the set the picuture will go back to normal for a bit and then it doesn't hold after a while. Just wondering if there is a quick fix something needs to be cleaned resoldered etc. Thanks for your help.
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<p>How to check the colour cathodes of a picture tube for emission<br />
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<p>It is very easy to cehck the emission of the cathodes of a colour picture tube. Assuming all other circuit parts are working, including LOT [Line output Transformer] and video output section.<span> </SPAN>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.<span> </SPAN>Keep the brightness, contrast and colour control to zero position.<span> </SPAN>Take a wire of suitable length, say 50cms or so, tie its one end to TVs chasis [negative].<span> </SPAN>Take one resistor of value 100K 1W, tie its one end to the other end or the wire, thus one end of this resistor is now connected to negative chasis and the other end of it is free now.<span> </SPAN>Hold this resistor with with some electrically noncunductive material [using hand gloves will be better]; switch on the Tv, wait a minute or so to get it warm up.<span> </SPAN>Just make a touch at each cathode of the picture tube base card solderings.<span> </SPAN>Just one touch will give you a colour of the respecive cathode on the screen.<span> </SPAN>Never hold it for long time. This process can be used for checking cathode emission of any type of Cathode Ray Picture tubes. <br>
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If this is the old style CRT TV then it sounds like the picture tube has gone, the Cathode Ray Tube is not an economical replacement.....unfortunately it will have to be disposed of and replaced!
a good indication of one or more electrolitic capacitors failing or a cathode ray tube ie picture tube with a heat related internal short shutting down the high voltage system if this is a rear projection tv time to call a certified electronic tech
How old is the TV?
Sony Trinitron sounds like it may be from the 1980's?
Some TV engineers can use a piece of equipment to do a "tube boost" but this is sometimes risky and can completely ruin the tube, but it's a risk you would have to take.
If the TV is over 15 years old, and has been used regularly, (like 4 hours every day or more) it seems likely that the tube has reached the end of life.
TV cathode ray tubes are like light bulbs...they do not last forever!
The monitor is old. It could be slightly adjusted. But when you start getting lines, soon the image becomes blurry, and during CRT death the Cathode Ray Tube radiates 100 times the radiation of a healthy monitor.
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