Why is my Galaxy Note Edge not powering on or charging?

Hey I'm new to the forum. Ok I just bought a Galaxy Note Edge online from Ebay and received it yesterday. Since then I've been using it and everything seemed fine except sometimes when the phone would sleep after not being used, the screen would stay black and the blue LED light would flash until I removed the battery and put it back in. I did that a few times and it powered back on fine. Today, I had a almost full battery and let the phone sit awhile and came back to find I couldn't power the screen on from it sleeping, so I removed the battery again. Only this time it didn't power back on and still hasn't. When I put it on the charger nothing pops up either, not even the LED lights. Charger works on my other phone so its not the charger. I tried the safe reboot and hard reboot, neither power on the phone. Not really leaning towards a bad battery but that could be the cause, I guess I could test it with a multi meter. The only option left is a dead Motherboard. I'd rather fix it myself or have it fixed before I decide to send it back, unless the repair or cost of repair is outrageous.

Anybody else experience this and find the problem and a solution ?

Is the Mother Board replacement rough ? And what tools will I need ?

Any input will help. Thanks in advance guys :)

And which wireless charger should I buy ? Isn't the backside under the battery cover of the Note Edge the same as the Note 4 ? Meaning I can buy one for the Note 4 and use it for my Note Edge ?

Asking because there's not alot of them for Note Edge in stock but there are for Note 4.

Keith, how about this kit ?

Note 4 :

Note Edge :

The wireless charging prongs are different from Note 4 and Note Edge, so no they are not compatible.