Your model number (along with other information such as serial number) can be found:
- On the back of the TV on a large sticker. This will also show you serial number, power consumption, manufacturing date etc.
- On the right side of the TV along with the serial number. This should be visible even if the TV is wall mounted.
You can find more information at the following link: http://support-us.samsung.com/cyber/popup/pop_modelserialnumberlocation.jsp