Chosen Solution
Hi, this phone suffered a major drop. Shows no signs of life but when plugging into iTunes it says that its in recovery mode and needs to be reset, but i need the data off of it. I found a short on the pp_1v8 circuit which is located almost where the phone got hit, so it makes sense, vcc_main seems fine to me, checking pp_gpu and pp_cpu i get low diode values, but checking for ground shorts on these two lines i get no beeps on the multi meter. I dont really know how to proceed, i cant find any visible bad caps that need replacement, i would change some caps in the 1v8 circuit to see if it clears the short but im worried about the gpu and cpu power lines. Any help or recommendations?
GPU and CPU lines will be fine as they have a very low resistance. Check the big 1V8 caps either side of the NAND these are the ones that turn into wires. I know there are a lot of caps on this line but from experience it will most likely be one of the large ones. · Use a pair of tweezers and slightly nudge them and see if any feel loose. · If you haven’t got a DCPS or thermal cam use a bit of Isopropyl alcohol on the caps while the phone is powered up. · When you find the short don’t worry too much about replacing the cap until you get your data off. You don’t want to subject your phone to unnecessary heat. The phone will boot fine without a few of the 1V8 caps.
