I bought a second hand Sony VPH-D50QM from my work place at an excellent price. It had less than a 1000 hours on the tubes and was generally in excellent condition.
There is one problem however, I can not seem to get the blue tube focused sharply.
I’m new to CRT projectors, but I’m 99% confident that this is not a optical focus problem, but rather seems to be a problem on the tube face (focusing electron beam possibly?). This is quite puzzling to me as the set was obviously set up by an expert when first installed in the work place so I can’t understand why the blue tube wouldn’t have been set up properly when the other two were, or why the blue tube would develop a problem when the other two seem perfect.
There are some magnet levers inside at the back of the tube, I’ve had a quick play with them and while I can make the focus much worse, I can’t seem to make it better.
Any suggestions would be greatly appreciated.
I still rate the picture quality as excellent but it’s really bugging me because I know it’s not as good as it could be.
There is one problem however, I can not seem to get the blue tube focused sharply.
I’m new to CRT projectors, but I’m 99% confident that this is not a optical focus problem, but rather seems to be a problem on the tube face (focusing electron beam possibly?). This is quite puzzling to me as the set was obviously set up by an expert when first installed in the work place so I can’t understand why the blue tube wouldn’t have been set up properly when the other two were, or why the blue tube would develop a problem when the other two seem perfect.
There are some magnet levers inside at the back of the tube, I’ve had a quick play with them and while I can make the focus much worse, I can’t seem to make it better.
Any suggestions would be greatly appreciated.
I still rate the picture quality as excellent but it’s really bugging me because I know it’s not as good as it could be.