I just got this TV from a neighbor who moved out and he said the TV worked fine, but one of the tubes burnt out, it was either a blue or a green one, I don't remember what he said. He also said it caused the green and blue colors to not display properly. So I turned on the TV and it works, and there's also a quarter-sized blue dot in the middle of the screen. Not sure what that is either. Are either of this viable problems that can be fixed?
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Re: burnt out tube?
If you have a dot, this means that there is no scanning to that colour channel. This fault can be in the scan amplfiers or the deflection yoke itself. Another issue, is that it is also possible that the tube is weak. I am sure that the person you took the set from had an estimate done on it, and did not fix it for very obvious reasons.
This set will be very expensive to fix. Go out and treat yourself to a good LCD or Pasma set, and you will enjoy it much more than an old tube type projection TV set!
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The set if projection which model here is, has arced and now each of the three picture tubes used has a tiny permanent burn mark on its screen.
That is what you are seeing, the set uses three picture tubes with screens like the old tv sets===the coating has been burnt in each, want to prove it, remove rear cover and cover any one of the three lens and that mark on one tube will go a way.
The blue picture tube has gone bad. Sadly they are no longer availible for that unit. But the blue tube assembly can be sent back to a company called Video Display. They rebuild the tube for a very reasonable price. The hitch is that it takes a professional tv tech to reinstall and align the rebuilt tube. Most respectable shops will do this work but the repair is spendy. Usually around $450 to $500 or more.
I had a television that went to a bright shade of blue.A friends neighbor worked for sony television plant where the new tubes came down the assembly line.His job was to make sure tubes were working fine,if one color was dominant then his job was to smack the front center of the tube with a rubber mallot to fix the problem.He suggested i try that with my tube while the set was on.It worked and solved my blue problem.Apparently he explained,the gun connections in the tube came loose and to fix it was to smack it this caused the connection to reweld itself.For you I would use the palm of an open hand and smack the tube dead center with a good hard smack.Dont be afraid of breaking the glass because its very thick and strong.Give this a try.Hope it helps.Good luck!
can you look into the blue lens when the set is playing using a hand held mirror and see if there is a picture in the blue CRT. If not you will need a new tube for the blue. If you do need a tube let me know as I have a source for good used tubes that are very reasonably priced.
blue tube is very common on this type of tv, His prices are very fair.My concern is the other tubes i usually could tell if the other tubes looked ok. If he says they seem fine.And you like this tv it is worth fixing. Make sure if you do say yes you get a 1 year warr on tube and a warr on labor,
Im not sure if you got price with yoke assy to or just tube. It is very hard to put yoke in tube and have it adjust properly. make sure when you talk to him it
is a new tube and yoke assy , If not dont fix.
Best case scenario, The blue crt could be fixed and refilled, and the board only burnt a trace on the board, a chip or resisitor or the like. I worked on televisions for a couple years in a small shop and had seen exactly this problem. We replaced the board and crt, lined (converged) it all up, and the cost was near $300. Probaly a good deal higher now. You could call the local repair shop and run those two ideas past them and ask what they would charger to do that specific work.
Could be burnt tubes or could be something on the optics .. sound like burnt tube.. burnt tube may be but most likey arent coverd in warrenty the tubes are about 250 to replace +labor and there are three. how big aret they quarter or size your hand? if the are small then they would be burnt tubes