Samsung LN46A550 TV with a Xentech IR receiver 291 Series

Congratulations !! Now finally you can buy new TV for you. Same case happened with my ViewSonic LCD Monitor. Its due to damaged PCB behind LCD panel. Check if you are lucky by searching PCB for your TV.

Have you tried doing this:
Press and hold the TV button on the remote till all 4 buttons light up and flash(make sure your TV is on). Once they flash, press the power button, then using the channel up button, point the remote at the TV and keep pressing it till the TV turns off. When it does, press the # sign and that will lock in the new found code.

Hope that helps........

Reverts eventually means there is some looseness some where. Please check connectors and cables between power supply- TCON, TCON- Panel and main board-TCON. If you cant do it show it to some qualified technician.

Apparently this is a known problem with flat panel TVs made a few years ago due to bad capacitors in the power supply. This same problem appeared in computer mother boards at about the same time so that the capacitors went open or shorted causing problems.There is videos on You Tube that addresses this problem see: http://www.youtube.com/watch?v=ZccykxrtX9g as a starting point and look around for other repairs

the IR is located next to the power button and you will have to select pioneer as your cable box brand and it will work fine

Testing remote control:
The remote control puts out IR (InfraRed) signal that human eyes cannot see, to find out if the remote is sending out the signal or not you just point the remote at the digital camera’s Lens (Digital Camera can detect IR), you should see flashing light on the camera’s screen when any one of the remote button is pushed. If you do see the flashing on the camera, then the problem is in the TV IR receiver or the main logic board; more troubleshooting with scope will be needed to look at the signals.
Parts: www.shopjimmy.com
www.remotes.com

You will not have any luck, The Screen only uses RF for control. As far as I know there is no IR receiver on the unit or any RS232!! A nightmare for integrating this product into universal control systems.

Possibly your new equipment doesn't use IR (infared) as the media for the remote. I have used the pyramid and different versions of it for DirecTV/Dish and most everything else for years with no major problems. occasionally a unit will fail, but that happens. If the red light blinks on the "transmitter" (no antenna) it should indicate that it is receiving IR from the remote. The "receiver" (antenna) has to be oriented correctly in front of the unit to be controlled. I put the receiver no closer than 5' to the unit. The signal coming out is a cone shape and it's easier to aim the further away you are. As a test, you could try using the remote to control a stereo or something else, even a fan. If the remote has a led or a dark red plastic cap on the front end, it should be an IR unit.

The remote Ir receiver for this television is RCA part number 245282. I could not find the whole board available but this was available at many places.