Slate 7 flex cable charging bypass

Hello, i bought an hp slate 7 2800 at an auction. When i got home i realized that someone has removed the micro usb charging port and the flex cable. After doing a little research i found out why. The cable sells for over $50. That is rediculous and more than i paid for the entire tablet.

I managed to slavage a micro usb port from an old phone and modified an external battery charger to directly charge the battery but i want to be able to use the tablet's built in charging controlls and any charging cable.

In order to bypass the flex cable i need to know which oins on the 16 pin connector on the board are the +&-.

If anyone has a slate 7 that could please test the pins for me that would be great.

I dont care about data transfer or anything. I just want to be able to charge it safely.

Thanks

After hunting for the internal cable , I can guess which are ground by the vias, presumably a ground plane for data on the back side.

Does that help? a Micro USB to USB cable is cheap.

Here https://www.pchub.com is my source for used laptop parts.