I had the same problem when I took mine out of the box.
I soon found out that it had nothing to do with the cmos.
Sony directed me to make a change on my power settings.
Some cameras come preset for power in Europe not North America.
This setting was able to fix my problem.
Have a look at your menu and make the appropriate changes.
This also reduces strobing if you have an issue with that as well.
Cheers,
Rob