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Re: guns on their last leg- color fading
If you are asking about Guns in rear projection tv then answer is No. Rear projection TV has 3 Guns (CRTs), red-green and blue and each gun has its unique color phosphorus coating to produce its mono color (red /green /blue) and these are not interchangeable. Need further info, let me know.
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That is a common symptom in projection TVs that use tubes or "color guns" As the set ages the emission in the picture tubes (there are three) begins to slowly fade.
This is unfortunately a normal thing for those older projection sets. A set of tubes will last anywhere from 20,000 to 40,000 hours of operation then they are simply worn out. They can be replaced but I don't recommend it due to the age and technology version of your set. The newer type big screens use a different principle. They either are LCD or Plasma these days. The advantage of the LCD (Liquid Crystal Display) is they are very low in power consumption. The disadvantage is that you can never get a true black, only close. On the other hand the Plasma TVs are more consumptive of power but will give a very sharp image with true black levels. The choice is up to you but I suggest you replace your older television.
HELLO. it sound's like you have a cold solder problem.!!! what that mean's is that when the set get hot .!!! it lose's it's contack.!!! you might try going over the chassis .!!! soldering the conteck's.!!! with a low watt. solder gun.!!! not over 40 watt's.!!! and use 40/60 rosin core solder.!!! hope this help's you .!!! "GOOD LUCK"