I have something that is rather annoying on my bench right now. It's a 5th gen iPad that came to me with an obvious tristar chip fault. In the process of removing the chip and cleaning the pads though, I displaced a component next to the chip, and I can't find it to replace it, and I can't find a schematic or board layout for this specific model iPad, but I have schematics and board views for pretty much every other iPad. Considering I had no choice at the time, I decided to risk that it was a filter cap and put the device back together to only get a boot loop. This suggests to me that it was likely a resistor or a diode, and something isn't getting power that should be.
Here's my thinking so far. Looking at the layouts of other iPads and iPhones, the components that surround tristar are almost all capacitors. Some have only a couple zero ohm resistors, and some have a bunch of zero ohm resistors. About half seem to have a single diode in the area. None have a resistor with any value higher than zero. So, I'm thinking that the chances are pretty good that I knocked off a zero ohm resistor, but if I'm wrong, and it should have been a diode, I worry I might kill something, possibly something important. On the other hand, if I put a diode in there, it is possible that it will still work, but is also possible that it could blow, which might have a chance of blowing the pad out, causing me to swear profusely.
Would it be safer to try a diode or a resistor in the spot, or does someone have a better method of figuring out what the component should be?