I have a Q7 F, same problem! only 1 year and half old, started doing same problem as many others here.
asked Best Buy and geek squad for warranty.
they deside to repair, 2 month with out TV!! still wating!
They said Motherboard and pannel, Im affraid to have the same problem when warranty expire!! this will be my last SAMSUNG TV.
I took a Video to show the tech. watch here
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