For the newer Smart TV you can find the model code and serial number by going to the menu (Menu -> Support -> Contact Samsung)
a. Press the Menu Button on your Samsung TV remote control and go down to Support.
b. Under Support look for Contact Samsung on the right side.
c. Open Contact Samsung and you will see product information including the Model Code.
You will see something like this
Model Code: (for example, UN60D7000VFXZA)
Serial Number: (for example, HY32598D291K)
In this example the model code should be UN60D7000VFXZA and the serial number should be HY32598D291K