Galaxy tab 3, screen has power but is black.

"yo guys ya'll can also do this.

press the power on button and the volume up button for at least 5sec and release for 1sec and then press both in again your tab3 will restart and that's it."

Simply restarting the tablet doesn't always fix the issue.... I know that it certainly didn't work for me.... The black screen issue is on most cases due to the device being dropped (even if it didn't hit the deck very hard). In the process of doing so, what's happened is that it more than likely has slightly dislodged the LCD connector. What you will need to do is remove the back cover to your tablet (Make sure that the tablet is turned off before attempting to remove the cover in order to prevent any potential short circuiting in your motherboard or other electrical components). Once its open you will see 2 black tape looking connectors. 1 is for your LCD and the other is your battery charger. Both tapes should look fairly firm and tight. If they're not, then they are loose and more than likely the cause of your issues. You will see that at the connection point, there will (generally) be sticky tape or similar taped over the top. Gently remove each tape. Each connection point is only held in by a small black clip. Unclip each clip (easy to remove) then gently pull out and remove the connection. Leave each connection point unconnected for say 2 mins then carefully reinsert the connectors back into the connection points and secure it with the clip. At this point, what you want to do is to attempt to get each connector tape as tight as you can. the tape should late flat against the battery. you can do this by running your finger from the bottom of the tab and sliding towards the top towards the connection point. Then insert the connection point carefully and secure the clip. Get yourself some fresh sticky tape or electrical tape and stick it over each connection point. What I have found that seems to help is to also tape down each connection tape as well - just to help keep it secure. you don't have to go taping it down excessively, just 2 or 3 will do. I know that its the black screen issue we are attempting to fix, but the point of working on both tapes is that you may as well do it for the battery connector tape as well while you have it open. Hope this helps! :) Cheers!

Take off th tablets back cover and go to the thing that looks like the lcd cable but to the one on the far right remove the green tape take the cable put then put it back in

I restarted my tab 3 by pressing menu button + volume down button. Then the tab 3 restarted successfully. After that I uninstalled "Clean Master" and then the black screen problem solved in my case.

How do you turn I back on