I have had this problem with 2 of my Samsung tablets. The solution is simple, but you need to take your time and have a steady hand. Get a Tupperware orange peeler. You need a plastic wedge to gently pry open the case. The orange peeler has that on one end. With your fingernails gently get your nail between the back cover and the edge of the tablet until your nail slips in. Put the tapered end of the peeler in the gap you created. Gently move the peeler along the edge of the plastic. You will hear the clips coming undone as you go. Take your time and don't force anything. Once you have worked your way all around the back cover, you can gently remove it. On the back of the printed circuit board are a few connectors. These are tiny plugs that take a ribbon cable and plug it into a tiny socket on the pc board. This is likely where your problem is. On my Tab 3, the problem was the ribbon cable from the power button to the pc board. On my Tab S it was the ribbon cable from the usb port to the pc board. One by one use the wedge end of the peeler to gently lift the ribbon cable plug from its socket. Reset the connector back into its socket and try to turn on the tablet. Continue to check all the connectors and sockets. When you find the one that was the problem, cut a small piece of electrical tape and place it on the back of the offending connector. This will apply a tiny amount of additional force to push the connector into its socket. Convinced that you have found the problem, get some silicone glue and a toothpick. With the toothpick apply a tiny trace of glue along the plastic where the lid clips into the body. Then gently place the back cover where it should be and push it on to hear each clip as it clicks. When you have them all clicked in, you are done. Congratulations! You fixed it.
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