This is a Samsung SyncMaster 900NF monitor, with a trinitron tube. The problem is basically with the focus and convergence settings. If I calibrate according to top half of the screen, the bottom half will be off (and vice versa), in other words, I can't get the whole screen well focused at the same time. Is this a QC issue? or I was not calibrating it correctly?

If you know any solutions, please email me webmaster@21years.com, highly appreciated.