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Hello, im working on an iphone 6s water damaged that has the VBAT (PP BATT VCC) line taking 90mA when checked with power supply( phone turned off). What can cause this such a small short? I already cleaned it with isopropyl alcohol. Thank you guys!
What makes you think it’s short…even a phone that is powered off still draws some current for the “always on” part of the circuit and potentially to charge the battery. The proper way to test for shorts is to measure with a multimeter with the battery disconnected. Check the BATT_VCC, VCC_MAIN and PP5V0_USB lines to see if they are shorted. You can use Ohms mode or check with the DMM in Diode mode. If those lines are good, then start checking the PMIC outputs. Only when you’re satisfied the phone has no major shorts do you put power on it, otherwise you can damage the board further. Report back with your findings and we can give you more guidance.
I have the same issue, only that my iPhone 6S is taking 0.02A before prompt to boot. The phone is working fine, the only problem is that it discharges the battery overnight, even when the phone is off. The battery is new. I checked all capacitors on that line and none of them is shorted. In diode mode, all capacitor readings are around 0.910V. I replaced the Tigris and MOSFET from the donor board (I tested the board before taking these 2 IC’s so it’s a known good donor board) but there is still 0.02A draw on PP_BAT_VCC line. Any ideas?
