Fix:Nexus 7 (2012) Slow charge issue

Introduction 

Was using original Asus cable and Charger.

So the problem started after a bout 6 month, went i notice take it takes a while to charge the nexus 7. normally it takes about 4 hours to full charge but sometimes after 24 hour of charging it is only showing about 20% increase i charge. the issue was not permanent, every few weeks i get it.

So few days ago i got the same problem but now it was kind of permanent after few days the tab was having the same issue i tried different charges and cables. But the issue was not fixed.

Troubleshooting

So i measured the current tab was taking and found out it was only charging at 7milliamps.

and the nexus is showing in the display as charging so the problem is software or battery management or battery charging circuit. so i change the firmware but still had the same issue. 

• So at 5 v charging it was taking in .26A of current or at 5.3v charging current it takes in .45A

Fix ( at your know risk!!!)

• Using the normal usb charges it was only taking 0.07A SOMETIMES 
• I don't know the problem but a way to get around it is to use at a voltage of 5.33v to charge it. and then using a normal charge next time. only when this issue comes just use minimum charging voltage of 5.33v after that you can re-use normal charger.
•  problem could be in the flat-flex cable or charging circuits. 
• Also cleaning and re-plugin the flat-flex is a good idea, resistance of it is kind of high so even if one wire goes down huge voltage drop.