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This tv have a colors wheel. The tv colors wheel is dead.The buzzing noise is the cause of the colors wheel is spinning of is axis and rubbing sides of the motor.Hire a tv tech. for the job.Colors wheel is hard to replaced,because have to take out many other machanical parts,even before can change the colors wheel it self.
the variation from higher channels from lower channels, few things changes eg frequency, voltage, and current.
take your tv to a w/shop and have the following
tunner voltage pulse variation on a avo meter has you change channels. if the difference of voltage is not unform when you are changing from to channel then you should change the control ic on the rf stage or check the capacitors a round the rf ic for variations in value.
Got the same problem with my second TX-S3082WH Slimfit...the first had the same problem...it was deemed unrepairable and I was advised to return it to Circuit City...now a year and five months later Samsung support has been less than helpful as I am 5 months out of warranty...don't know what I'm going to do...any advice would be appreciated