Wenrhuang,
Please read my post, the one above yours. Also, regarding:
This is not uncommon and not far off what I posted before you said the system seemed to be headed in a more positive direction.
Unless you have a lot of hours, be prepared for it to go wrong again before it gets right. I know this seems improbable, but mirrors my experience in many situations.
Please read my post, the one above yours. Also, regarding:
I am also curious that is it, and how is it possible for a burn in to go in opposite direction in different stages? That is, for instance, for system to becoming brighter at one stage, and then become darker at another stage?
This is not uncommon and not far off what I posted before you said the system seemed to be headed in a more positive direction.
Unless you have a lot of hours, be prepared for it to go wrong again before it gets right. I know this seems improbable, but mirrors my experience in many situations.