Why is my Samsung LNR408D LCD TV volume stuck?

[GrimaceGuy]

I bought a Samsung LNR408D a couple years back but as of this last September, have had intermittent problems with the volume buttons on the right-side panel of the TV. It starts out with the <volume down> being stuck, causing the volume menu to always appear showing a 0. This is tolerable because I use a receiver for audio and it's just an annoyance. The button is not actually being pressed, and when I manually press it, the TV shows a "This cannot be done in the current mode" error in HDMI mode, and causes a chanel change in Air TV mode. After a day, the <volume up> button gets stuck, making the TV completely useless, as the volume goes directly to max.
In the past, I've fixed this by shaking the TV around and flipping it over a few dozen times, and eventually it goes away.
I'm guessing the cause is a piece of dust or something getting stuck in the PC unit or something, which is why my shaking it 'fixes' it.
Does anyone have a clue as to a real solution?

Yes, I brought it to an electronics store, but the fact that I put it in my car to move it there solved the problem, so I just wound up wasting $78 plus tax for them saying nothing was wrong.

[Broadcast Engineer]

I defer to TV Tech Man's answer, after all he fixes these things for a living. But my guess is you are right the buttons may be stuck. But it could also be a bad integrated circuit that is intermittent or bad power supply voltage to that circuit caused by a dried up capacitor or a crack in a circuit board.

Take it to a TV Tech and get an estimate because it is probably worth fixing and not that expensive compared to a new set.

[Broadcast Engineer]

I defer to TV Tech Man's answer, after all he fixes these things for a living. But my guess is you are right the buttons may be stuck. But it could also be a bad integrated circuit that is intermittent or bad power supply voltage to that circuit caused by a dried up capacitor or a crack in a circuit board.

Take it to a TV Tech and get an estimate because it is probably worth fixing and not that expensive compared to a new set.