Anyone have any more info on this? I'm running into this problem as well...same symptoms and missing two IC's in the area shown in the posted picture. I'm game for trying to replace them, but I can't find any information on the specs for those IC's.
I spent a lot of time last night digging around the web, and thought I'd post some info that may be helpful to folks in the future. First of all, a complete schematic of the IC's on the iPhone 5 logic board can be found here:
I have no idea how long that link will work, so no guarantees there. The password for the .RAR file that downloads is "rn325", without the quotes of course.
The three IC's highlighted by a previous poster are Q7, Q3, and U3 moving from left to right.
Q3 and Q7 seem to have something to do with power circuitry, so those specifically may have something to do with power button functionality, although it's not explicitly mentioned in the schematic. I don't happen to be missing those IC's, so I didn't dig into those any further.
I do happen to be missing U3, which definitely plays a role in the functionality of the home button and power button according to the schematic. I found a data sheet for the IC, which seems to be manufactured by NXP:
I also happen to be missing the iC just to the right of U3, which is DZ101_RF. This IC has something to do with SIM card detection, which makes sense in my case because the phone never recognizes that it has no SIM card, nor will it read a SIM card when one is inserted. This part seems to be manufactured by Texas Instruments:
Now my problem is...how do I get my hands on these parts. Obviously, these are typically purchased in very large quantities, so I'm thinking that finding just one, or even a reasonable amount, is going to be impossible. The only option might be to find a non-functional iPhone 5 logic board somewhere and use these particular parts.
If anyone has any advice on where to find these replacement IC's, I would appreciate it very much!