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KP-43T70 is a CRT based rear projector and does not use a Lamp like newer LCD/DLP projectors. It uses 3 (Red, Green, Blue) glycol liquid cooled CRT's (like the picture tubes of yesteryear) to produce the image/light as opposed to a Lamp.
Ok, I have a option for you--the set you have mentioned did have bad tubes---all of them--if picture comes on blue and then it shuts off there is one simple thing you can try---first the tubes are only available on a rebuild basis--means you have to remove the bad one and send it out of for rebuild--expensive.
If you want to know the simple option that may allow you to use the set---rate this solution here and I will tell you what to try--no parts to buy--just an adjustment-
Hi, sorry. but this is not something you can do, after replacing tube there is a large alignment procedure that must be done as well.
total time for a seasoned tech is 4-5 hours if everything goes well, my advice is to call every shop around you for the best deal, hope this helps, video-tek
You have a bad blue picture tube. If you replace it the red and green will be weak and probably go sooner than you think. Everytime I had to replace a tube in a sony projo tv i had to replace all 3 picture tubes at the same time. It's very expensive if you don't have any type of warranty coverage.
Focus block where the trimpots are that you turned down, appears to be suspect. Or it could be the CRTs themselves, but probability would say that not 2 out of 3 - and the third occasionally - of the guns would fail like this.
The FB prolly is leaking internally. It deals with HV all the time as part of its process. That HV could be breaking down the internal insulation.
I would replace it, re-set it up, and go from there.