The price on this was fairly low compared to other boards I looked at, but this went in exactly the way it was supposed to and works exactly as it was supposed to. The only real difference between the one I replaced and the one I put in, is the chimes are a bit different than the other. Big deal. Start to finish, including time to get a different tool I forgot to get the before I started, was roughly 20 minutes. If you've ever replaced a PC computer motherboard, you'll be at home doing this. Take normal static protection measures; i used the packing the replacement board was wrapped in. You'll need a medium Phillips screwdriver and optionally needle nose pliers to help with 1 or 2 plugs.Since there aren't any instructions, first unplug the unit. Then, there are 2 screws to remove the top bezel; wiggle it a bit to the right then pull top-down, and it comes out. Now there's one screw top toward the left of the display panel. Remove it, then push the panel up and pull out (don't pry or jerk it) a few inches. Everything is now exposed. Pull your trusty phone out and take a couple pictures so you know what cable goes where. There are a total of 6 cables to pull from the board (I found needle-nosed pliers to help on a couple to pop the release), plus a ground screw that's screwed the the metal housing on the back. You'll want to remove that so you can lay the board down, unscrew the old board (4 screws), put in the new board, and do everything in reverse (refer often to the photos you shopped earlier).