iPhone 6s - Dead - 20ma draw from battery or 437ma (0.44A)when plugged
I have an iPhone 6s that I’m really struggling to get it to boot. The phone was water damaged and has been ultrasonic cleaned. It doesn’t look too bad, mainly just had signs of water around the WiFi IC, a little around the backlight driver (but doesn’t seem enough to have penetrated the huge amounts of conformal coating/glue or whatever it is that’s normal in that area!) and also at the very bottom of the board below Tigris. So I suspect water had got in near the camera at the top and near the speaker at the bottom.
When plugged into the DCPS I get 0.00A (good start) but then on prompt to boot I only get 0.02/0.03A so about 20ma. When I test with a lightening cable I instantly get 0.437A (through the usb cable) as soon as I plug the cable in, and it then just stays like that.
i’ve checked the voltage and diode readings on all power rails and I can’t find anything wrong, besides PP_CPU gets a constant 0.898v whereas a known good board fluctuates from around 0.5v+ but I think this is probably not the cause of the fault but an effect. I did find 2 capacitors that were bad on VCC main which I’ve removed, they were C5283_RF and C5284_RF near the WIFI IC, they were causing the diode reading on VCC main to drop, I’ve not yet replaced them.
Does anyone have any advice on what to try next?
As always, really appreciate advice on this.