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Discussion Starter · #1 ·
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.
 
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