A:AnswerThe only difference between those two TV's is that the model# 50LF621U19 was an exclusive from Bestbuy and the other one was only sold at amazon.
Ruben- Insignia support
A:AnswerTry a different picture mode. Press and hold for 3 seconds the Home button to launch the Quick Access Menu, select Picture to adjust the picture settings.
David M. - Toshiba Support
A:AnswerThere should be a setting that allows you to choose whether tv starts from last input used or not.
I'm pretty sure we had to change that also. It's been about a month and tv is not with me here to give the exact menu option. Sorry