How do I "adjust the voltage"? Do I need an authorized tech here? Any suggestions as to where to get it done for a decent price?
The voltage adjustments are on the power supply boards. It is best to use a Samsung Authorized tech that way if they haven't done it before they can look up the info on Samsung's ASC website, so it is done correctly.
I would say bring it to me, but I'm in Abilene. You can call 1800SAMSUNG and they can direct you to the nearest Authorized Service Center or you can check online.
It is a fairly straight forward procedure, so I wouldn't see it costing more than $100/labor if that is all it needs.