Can you tell me why is this happenig is the deflector cap or some ressiostor is going bad can t see the problem there is one vertical line in the center of the tube and the horizontal beam ov the lamp doesnt get all the way down think its low voltage.

 

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No, I can't tell you why it is happening. It could be caused by any of a very large number of problems. You will have to do some trouble shooting to narrow down the possibilities, or take it to a repair shop.