Facing TV Problems? Ask a TV Technician.
Hello, and sorry you're having problems. Yes, this is a common issue with Samsungs- and it's caused by a fault in the Mainboard. The Mainboard provides the turn on command, and it is what displays the Inputs (cable, DVD, etc.) after that Smart TV logo appears. Since it's turning off right at the point the Mainboard would engage- and then turning itself back on- this is a Mainboard failure. I can help you with finding the part, and also with a repair cost if you choose to have a shop do it- but I need the model number off of the back of the TV for this.
Just a quick note- the Mainboard is usually only around a $100 part, and you can change it out yourself with nothing more than a screwdriver (no special tools or soldering is needed).
Do you need any further assistance with this?