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We've had the set just under 2 years.
The problem started about 2-4 months ago....it seems to be lasting longer though and that is why we have begun trying to fix it.
DVR, Xbox 360 and a Wii and yes the issues are the same with each device.
Thanks for the reply.
This is a known problem with this set and there aren't any settings or resets on the TV that will fix this.
This does require a component be replaced in the set, and it's a pretty simple swap of a board. The Power Supply/Inverter is failing, which is the component that controls the backlights of the screen. I've diagnoses about a dozen of these successfully in the last couple months.
If you're not comfortable with this type of repair, then a Tech will typically charge you around $175 parts and labor for this type of repair.
In this case you can use the link below to locate a tech in your area:
If you need further assistance let me know and please do not forget to rate my service accordingly.