I had very little problem prying of the back of my nexus 7 2012. Once you get the first corner done, the rest comes pretty easy.
I ended up using an old hotel keycard as a spudger and it worked fine.
I needed access to the cables that connect the touchscreen to the motherboard so that my touch screen would respond.
Worked like a charm!
This guide enabled me to replace a bad charging port.
Note - the replacement microUSB port didn’t have the little chrome frame around the port - so I had to carefully scavenge the frame from the old one just to give the new port a little more support when plugging in a cable.
I’m going to use a magnetic charging adapter to reduce the wear and tear on the port, but this one saved the day.
This works! One of my kids - no one is confessing - must have spilled coke or something sticky on the remote. The upper keypads and the volume keys were totally stuck.
Following these instructions, I was able to take the whole thing apart and clean all the keys as well as the frame with alcohol without dislodging the touch screen connector from the screen. In fact, it looks like my remote has an extra blob of adhesive where the ribbon cable attaches to the screen - maybe there were issues with early models?
Anyway, if you’re careful, you can take this apart and save your expensive remote.