I have a Panasonic PT-42LC14 tv and according to this web site DTVTransition.org - A New Era in Television Broadcasting my tv is digital and should be able to work without a converter box but I don't know how to change it to digital.
Yes but he deosn't need a converter box because his T.V is newer and has a built in digital tuner. (he states this)
Correct if he has some sort of signal from the outside ie: cable or dish then he won't need to worry about switching it over from analog to digital but if he uses an antenna then he still needs to switch his tv from analog to digital hence the question.
Let me know how you receive your tv. ie: cable/dish/antenna
If your T.V. says ATSC built-in, or digital tuner built-in or if it's HDTV then you don't need to worry about it and as far as switching it over it should be an automatic configuration, youshouldn't have to do anything!
"why would anyone with an HDTV have an antenna at all?"
Could be in mountains/remote area where their is no Cable, or Satellite, or no extra Money for monthly payments.
As per the previous posts, I'm assuming you're concern is with free-to-air digital TV reception (and yes Lowtax4eva, in some countries we have [soon] dozens of free digital channels, so why pay money if you're not a couch potato?).
Have you 'scanned' for your digital channels? Somewhere will be some sort of 'Setup' menu that includes a selection to 'Auto scan' (or some such). This will cause your TV's tuner to scan all the available channels looking for any digital transmissions. When finished, you will be able to select any found channels with the channel up/down button (at the least).
You might end up with multiple copies of some channels (from different transmission towers), in which case you might want to then go into the 'Edit channels' menu and delete those with the weakest signal (there will be a signal-strength display somewhere, for each channel, possibly as you switch to each channel with the up/down buttons).
If this is not your problem, please give us some more specific details about what you are trying to achieve.
I have done the auto scan and I can only get 3 channels and they are the normal channel stations meaning they aren't some number like 11-14, they are the right station for the number that I have always got. I thought I would get more stations and now I only get 3. I didn't know if there was someway of changing a setting on my tv to switch to digital.