Need help understanding how to troubleshoot board issues

Hi,

I’ve got an iPhone XR that keeps on rebooting on random occasions. I did notice when the front facing camera is plugged in, it doesn’t recognise it. So I thought I’d take the initiative and see why this is the case under my brand new AmScope microscope! (NerdGasm).

The reading’s I’m receiving from my multimeter are majorly all saying OL and some of them have the odd very low diode readings; such as 0.007 on the J4600 (pin 34) on ZxW. Around that general area I have the very weird readings as mentioned. I thought I’d also make sure it wasn’t me being a derp and I ran the same tests around the rear camera (J3900), to make sure I was indeed getting the correct readings. All the readings from J3900 are all correct on ZxW.

Now I need help from all you lovely people on how to diagnose where to go from here? I’m brand new to this level of phone repair. I’m not going to attempt micro soldering yet as I don’t feel confident, but I’d love to find where the problem actually is and how to solve it (cause that’s how you learn).

I’m still looking around the board for more anomalies, but momentarily this is the current issue. So, can anyone guide me on where to go from here and what I should do?

Thank you,

Craig.