iPad 4 not charging, replaced charging IC, same result
Hi guys, I got an iPad 4 here. Problem reported by customer: not charging beyond 1%. As routine I tried a new charging port, new battery, same result. So I guess the charging IC chip might be faulty. So I went ahead to replace that charging IC, to my surprise, it made no difference. When plugged to charger, the iPad turned on, usb tester displayed about 2.1 Amps of power getting into the iPad when plugged to charger. But it only last for a few seconds, after the iPad boot into main screen, it stopped charging immediately, USB tester displayed 0 Amp. I even tried another new charging IC, exactly same result.
Upon further testing, I found the input side of the charging IC is OK, PP3V0_S2R_TRISTAR line has 3V detected, PP1V8_S2R_USBMUX has 1.8V detected, but the output side PP3V3_ACC got no voltage detected. I guess that’s why it’s not charging. Can anyone suggest what to do next? I already tried two new charging IC, so I don’t think charging IC is a problem. Any help would be very much appreciated.
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