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KV36XBR450 is HD ready which means that you will need a set top box to
receive the HD signal. Comcast will provide this for you naturally at an
additional expense. Your other option would be to purchase a set top box
and use and OTA (over the air) antenna which will allow you to receive
your local broadcasts in HD.
I am sorry, however i have no heard about upgrade for this set. There is nothing available even with Sony.
The title on this page says standard TV, and then you say you have a 42" flat-screen TV. If it is a flat-screen...you have a possible problem with the signal board. See a tech with this info! If it is a standard HD TV [tube type] it would be the scan converter board...attached to the high def tuner. Hope this will give you clue!
No this TV is not HD ready. However it is digital (ATSC) ready meaning now that most of the analog brodcasts have stopped it will receive the digital broadcasts so you don't need a converter box. Since it can only display 480i resolution it is not HD ready. You would need a TV that can display 720p or better to be considered HD ready.