Hi, my Galaxy tab stop charging and won't start.
I open it and disconnect and reconnect the battery but the problem still exist.

Also I try hold power button (30 and 60sec) , power + volume up, power + volume up + home

Again with no effect.
So Is there any other way to fix it ?

P.S. when I disconnect the battery I charged it with charger connect directly to red and black (+ and -) cable to 4.2 V. So the battery is charged.

I connected it in tablet and the voltage is 4.18 ,when press power button voltage drop a little to 4.16 but again won't start .