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Not uncommon on this model as a lot issues with the red and most of them are caused by touchy master screen controls. The set has a black rectangular block with three screen and three focus controls, for whatever reasons the red screen control always seems to be the flaky one and usually a very tiny adjustment of that one does cure the problem.
You should not adjust those knobs...Turn them back down - the ones marked "screen"...then power up and turn them up again slowly...if you go too far they will shut off again. Once you get the tubes back on again as normal you can fix the original issue for dull video. Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.
Red picture tube needs screen voltage adjust. Open fornt or back of TV and look for a black square looking box with adjustment knobs. Look for red screen adj and slowly turn rt or lft until lines just disappear. If screen goes too bright tv will shut down, just turn back on again and retry
Capacitor failure is the most likely scenario the FMT ans Signal PWB would cause the picture interference and the power pwb would cause the lamp light to turn red and give a 34 code when the device/ input and menu buttons are pressed in together and held for five seconds. That chassis has issues with every board in the chassis having failed capacitors you can get repair kits for the V26 chassis at the follwing link that come with instructions. Your model is the V26 chassis. Heres the link. http://servicemanuals.vstore.ca/
Adjusting the picture tubes is a scary proposition, but since you have already done it...
The easiest way to balance the gray scale is to turn the color all the way down on the set. The next part is easier with two people if the screen controls are on the back of the set. This is the part you saw that has six small knobs on it. There are control for the focus of the red, gree and blue and for the screen level of the red, green and blue. You will want to adjust the screen controls in an effort to get the picture black and white (this is why you turn the color down), hence the term "gray scale". Just make slight adjustments, take your and be patient. It will take some time, but you will get your picture balanced back out in time.
intermittent convergence fail. suggest re-soldering the 2 convergence output ICs on the middle power board. they are the 2 large devices located on the largest heat-sink on the middle board(looking at from back) once you re-solder them as long as the aren't faulty internally you should be all set.