I need to re-program my Harmony 520 for a new TV.

You should just be able to plug the remote into your computer with the USB cable supplied, go to the Harmony website listed with your product packaging, and Harmony will walk you through (very user friendly interface) a process which sets up your personal account, downloads the necessary setup software into your remote, and automatically programs your remote to whatever device you identify. With what you've said, all you need in addition to the Samsung brand name is the model number. The rest is done by Harmony including code installations.

I have the Harmony 600, linked to a tv and vcr and the setup/programming process was as uncomplicated as anything I've seen.

If you have the USB cable that came with your remote, connect your remote to your computer using the cable.
Go to www.logitech.com/myharmony and identify your particular remote (i.e. Harmony 520).
The site will download setup software into your remote and then ask you to set up your account.
Beyond that point, the site will provide you with a clear, step-by-step process which will ask you to identify the activities you'd like to set up (watching tv, a movie, etc.). Be sure you have the brand names and model numbers of the devices you'd like to link to your remote.
Programming is done automatically without your having to look up codes, etc.
When everything is done, click the "sync" button or whatever command button completes the programming for the Harmony 520 (I say "sync" because that's the closing command for the Harmony 600, which is the one I have. I would think the closing command is the same or similar for the 520).
After that, you're good to go.

Happy viewing.

I can help you reprogram your Logitech Harmony 520 remote for your LCD TV.

The Logitech Harmony 520 remote control is programmed through the Harmony Setup Software you can download from here.

Once installed, you will simply run the software, and select the devices you would like to control from menus. The software finds the right codes for you and loads them into your remote control.

I hope that helps.
_____________________________________________
Harmony 520 Manual Download
Logitech Harmony Firmware Update
Harmony Win Software Download
Logitech Harmony Safe Mode Fix
Harmony Remote Glow Light Fix

The Logitech Harmony 520 remote control is programmed through the Harmony Setup Software you can download from here.

Once installed, you will simply run the software, and select the devices you would like to control from menus. The software finds the right codes for you and loads them into your remote control.

I hope that helps.
_____________________________________________
Harmony 520 Manual Download
Logitech Harmony Firmware Update
Harmony Win Software Download
Logitech Harmony Safe Mode Fix
Harmony Remote Glow Light Fix

I can help you program your Logitech Harmony 520 remote for your TV.

The Logitech Harmony 520 remote control is programmed through the Harmony Setup Software you can download from here.

Once installed, you will simply run the software, and select the devices you would like to control from menus. The software finds the right codes for you and loads them into your remote control.

I hope that helps.
_____________________________________________
Harmony 520 Manual Download
Logitech Harmony Firmware Update
Harmony Win Software Download
Logitech Harmony Safe Mode Fix
Harmony Remote Glow Light Fix

The Logitech Harmony 520 remote control is programmed through the Harmony Setup Software you can download from here.

Once installed, you will simply run the software, and select the devices you would like to control from menus. The software finds the right codes for you and loads them into your remote control.

I hope that helps.
_____________________________________________
Harmony 520 Manual Download
Logitech Harmony Firmware Update
Harmony Win Software Download
Logitech Harmony Safe Mode Fix
Harmony Remote Glow Light Fix

I can help you program your Logitech Harmony 520 remote using your MacBook.

The Logitech Harmony 520 remote control is programmed through the
Harmony Setup Software Download for MAC.

Once installed, you will simply run the software, and select the devices you would like to control from menus. The software finds the right codes for you and loads them into your remote control.

I hope that helps.
_____________________________________________
Harmony 520 Manual Download
Logitech Harmony Firmware Update
Harmony Win Software Download
Logitech Harmony Safe Mode Fix
Harmony Remote Glow Light Fix

I can help you program your Logitech Harmony 520 remote for your Dish Network satellite box.

The Logitech Harmony 520 remote control is programmed through the Harmony Setup Software you can download from here.

Once installed, you will simply run the software, and select the devices you would like to control from menus. The software finds the right codes for you and loads them into your remote control.

I hope that helps.
_____________________________________________
Harmony 520 Manual Download
Logitech Harmony Firmware Update
Harmony Win Software Download
Logitech Harmony Safe Mode Fix
Harmony Remote Glow Light Fix

Go to this link on the Logitech web site and download the operating software and follow the instructions. Easy peezy.

http://www.logitech.com/index.cfm/440/371&cl=us,en?WT.ac=sc|downloads||dd

Go to http://jseman1.googlepages.com/Harmony.pdf