This guide is dangerous! Unless you turn off the service switch before pulling any cables you risk burning coils and components on the motherboard and pcbs. The service switch is located just to the left of the power switch. I also recommend removing the heatsink and pulling the battery cable to be on the even safer side. Just be careful to put the heatsink back exactly where it was and don't wipe off the contact paste.

It is unnecessary to remove the motherboard and pcb. Just unscrew the 28 screws around the frame, disconnect lcd and digitizer and remove the whole assembly.

If you are just changing the LCD it is no need to remove the metal frame and adhesive. You will just end up cracking the LCD and/or the digitizer. Just carefully unclip the lcd from the metal frame. Hold hand behind the lcd and flip over the whole screen putting the lcd in you hand.

Look at my guide here for disassembly for changing the digitizer:

http://www.snart.com/replacing-tf300t-di...