A:AnswerTo link an Echo device to this TV, open the Alexa app on your smartphone, tap Menu > Settings > Video and TV > Fire TV and follow the on-screen instructions.
A:AnswerThe mounting pattern for the 43" is 400 x 200 mm.
Here is the link for the Quick Setup Guide
http://tvna.compal-toshiba.com/us/wp-content/uploads/sites/2/2020/06/Toshiba_32LF221U21_TF-32A710U21_43LF421U21_QSG_V2_EN_Final_8TDMCE80100.pdf
A:AnswerThat depends on the available signals in your area and the strength of those signals in you location. For more information about the signals available in your location, please visit https://www.fcc.gov/media/engineering/dtvmaps
A:AnswerTry to connect a Blu-ray/DVD player to the TV using an HDMI cable. For product support please call 1 (855) 527-2411 available from 8 am to 9 pm CT everyday.