I have a problem with my corner focus on my blue tube, and the midpoint focus is to sharp. This gives me two problems, lack of sharpness in the corners and a brown field in the middle of the screen when a white pattern is shown. To solve this I tried to adjust the electronic focus on the blue tube but nothing happen, the electronic focus doesn't work on the blue tube 
What can the problem be?
The tube has no visible burns, and I had the same problem with my last tube I think. The tube is taken from a older BG808s, but I used the newest neck board.
I have adjusted the the lens focus and scheimpflug so thats not the problem The electronic focus on the green and red tube works just fine.
What can the problem be?The tube has no visible burns, and I had the same problem with my last tube I think. The tube is taken from a older BG808s, but I used the newest neck board.
I have adjusted the the lens focus and scheimpflug so thats not the problem The electronic focus on the green and red tube works just fine.
