Blinking red light on samsung ln40a500

SOURCE: i have a problem with my samsung tv

It probably is the Keyboard on the side. I've had this quite a few times. Simply pull off the back and unplug the side keyboard. It should be the last board in a chain of wires coming from the main to the IR sensor then finally keyboard. Unplug the keyboard and then plug TV back in and see if it stops, if so that was your problem, if not it will likely be your main board then. The TV usually can operate without the key board you will just have to use the remote for everything, but the keyboard is generally pretty cheap like $15.

SOURCE: Samsung LCD TV

hi,
your lcd ip board (power board) capacitor had already exhusted.
got to replace the ip board.

SOURCE: Samsung LCD TV will not turn on or off. Red light

hi,
your lcd ip board (power board) capacitor had already exhusted.
got to replace the ip board.

SOURCE: Samsung LCD TV Model Number

Replace the power supply to start with as it sounds like a capacitor has blown. If power supply is o.k then Im afraid your projector may be faulty but I'd be fairly confident its a capacitor, They are 80% of the problems we see coming in for repair. You can examine the power supply and see if you can identify the faulty capacitor and cut it off the board and solder a new one on of the same rating. It will be fairly obvious if one has blown as it will be burned and split. Dont touch any capacitors without discharging them though or you could get a bit of a shock. Google how to discharge a capacitor and youll see directions. Hope this helps.