I bought 3 Asus Memo Pad hd7 to my family. I had the same problem in 2 of them. I did the following and it worked perfectly:
I opened the back cover of the tablet (it's easy). After I disconnected the battery connector. So I took a digital multimeter and made as if to measure the voltage. I hit the multimeter in both ends of the battery connector that is attached to the motherboard and to my surprise got a voltage reading even though with the battery disconnected. The motherboard was energized I kept connected multimeter until the reading reached "zero" what may take a little time. Then I just connect the battery and mounted the rear cover again. Connect the charger normally. It's done. This worked for 2 who "died".
They came to life and are working perfectly. Hope this helps.