I drive a semi and only home a few times a week and on the weekends. So when we decided to buy a tv, my wife went a bout the one we had previously decided on at Wal Mart. It was a 52 inch Sanyo with a model number of DP52440, well, there was something wrong with it, so she took it back right away and exchanged it for supposedly the same tv, well when she got home she noticed this model number was DP52449. Those may not actually be the model numbers? I don't know. But anyway the new one is working fine. Does anybody know what the difference is between those two numbers?