iPad 4 Battery Drains While it still Charging

If you come across this situation that your iPad battery drains while changing. Someone think this is an impossible question to happen. But it is really exist. So vipprog engineer sort out some guide to solve this question. The tools that maybe you use will find at vipprogrammer.com.
Trouble Phenomenon:
The customer said that his iPad 4 cannot get electons into its battery. During charging time, the charging indicator at the upper right corner has a thunderbolt in it to indicate it is charging. The battery indicator now says 77%, but after a few minutes, it dropped to 74%.
Repair Process:
1. USB current voltage meter indicates that iPad has current when the screen is on or turn iPad off, as shown in picture 1-1.

2. USB current voltage meter shows no current when the screen is off, as shown in picture 1-2,which suggests that there is no current flowing trough the charging circuit when the screen is off.

3. Use multimeter to measure the voltage of battery pin BATT_SWI_CONN and it shows no voltage. While this pin of a normal motherboard should has 2.5V voltage. After changing its battery, the charging state recovers. The replaced iPad battery is shown in picture 1-3. Connect computer and use i4 assistance to test the charging state. Everything is normal, as shown in picture 1-4.



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