I don't know about the older ones. But I just tried to replace the Screen Digitizer. So the glass and touch screen on a Samsung Galaxy Tab Model: SM-T310 16GB WiFi model.
Unfortunately they have decided to glue the Glass/Digitizer to the LCD panel, making it very difficult if not almost impossible to replace only the Glass/Digitizer panel. (I followed a guide on Youtube where the digitizer was only glued to the bezel not the LCD)
I used a heat gun with different settings that i purchased from Harbor Freight for around $30 dollars that actually has different settings. I used the 570 deg F first and once I realized the LCD was glued to the glass I moved it up a notch to 660 deg F. Unfortunately I wasn't patient enough and ended up cracking the LCD as well. I'm not sure what temperatures the LCD can actually handle either, that may also have damaged it. I know the logic boards and electronic components can definitely handle that high of a temperature, LCD doubtful. Would be nice if one of the iFixit guru's could weigh in on this. I've taken pictures of the torn down unit, if you want me to post. It's not really a help in taking it apart, but it's verification for you that there actually is/was glue on the LCD in the newer models.