We have the Samsung LN46B650 - vertical lines just appeared last night with no apprent trauma to the TV. We were told by the repair shop it was either the screen or the circuit board. Does anyone have more information on this and know where we might get either part for less than the repair shop?

The problems u discribing could be either boards the Tuner board or the T-con board.The Tuner board is the board,take in the incomming signal cable.The T-con board is the board sit right in the middle botton of the LCD screen.To regulate and control the ditgital signal go into the LCD screen.If there no trauma to the LCD screen panel.Try change the T-con board first,because it small miner board and it cheaper $50-$75.The Tuner board it a major board and it big and it control all the incomming signal to the tv.This board,will cost u $150-175.Tries websites like Shopjimmy.com,Ebay.com to buy either T-con or Tuner boards.Change either of those boards or both.Same problems after this the LCD screen is short in useage and it dead.Not worth repairing,if LCD screen panel is dead,because it limited production and 90% important to the tv.It will,cost the same to replaced as to buy a new tv.If tv require a new LCD screen panel.