iPhone 5 wont charge battery if fully dead or phone is off

yes after doing some more search i found same thing a faulty u2 ic charging circuit. i did a hot air reflow to the chip and it seems to be working so far. i may have to re do the reflow with some flux but i think it may be ok. it has started to charge normally and is now recognizing dead batteries and charging them. at about 1 amp charge witch is pretty normal. also for any one looking at this post the u2 chips on a iphone 5 is located on the top side under the metal service panel near sim card tray, and the 5s it is on the back side under the metal service panel near top left side of the lower mount hole of motherboard close to the mobo antenna, i was working with a 5s this time so i just cut a medium size hole in panel and reflowed the chip with hot air. i would recommend using flux if you have it, and to let it cool down all the way atleast 30 mins, also if you do use flux then clean it up to best u can. thanks guys