Chosen Solution
Hi guys, does anybody have known good diode readings for the J6400 charging port For an iPhone 8? or even a photo of the ibridge that shows what the diode readings should be on the J4101? would be very much appreciated if anybody could upload. UPDATE: I have discovered that what is causing the boot loop is the dock connector, When I unplug it, the phone turns on normally, no issues at all. That is also why the lightning port does not work when I plug the charger in (does not charge battery) and also why when I connect to itunes or 3Utools it does not recognize the phone at all. So I am one step closer. As stated bellow all the pins that were measured for J6400 in diode mode (red on earth, black on pins) looked normal and did not find short / open circuit. So the question I have does this mean definitively that the dock connector / Charging port is bad? and in need of replacing? I have attached a photo also of the J6400 connector, please have a look and let me know if it looks fine. There is 3 pins (pin 40, 42, 44) look a little worse for ware but still measures ok please check diode readings below. I have marked them with a red lines. But I am thing that if they are bad then the measurements would be off no???
Would really appreciate some feedback on whats happening. Thank you all.
Here is J6400. I don’t know where you got J4101 from. If you are trying to sort out a charging problem you are looking in the wrong spot.
Housing replacements are notoriously difficult. The ones that come pre-populated can have low quality, if not outright defective flexes and doing it yourself exposes you to a ton of variable if things dont work. As for your diode readings, the ones you have to worry about are low numbers or shorts (except for ground ;-). Did you put the red probe on ground and probe with the black lead? Your numbers seem high. I would start by testing a bare-bones setup. Start by disconnecting the battery first (always!). Then disconnect the digitizer, LCD, front camera, rear camera and home button extension flex. Now re-connect the battery; you should only have the battery and Lightning Dock flex connected. Connect a known-good, preferably Apple-original Lightning cable to an iTunes enabled computer. Does iTunes recognize your phone? If so, then you should re-connect one flex at a time until the phone stops working. I would start with the Home button flex first, then add the rear camera, LCD & Digitizer then from camera flex. If the bare-bones setup does not get recognized by iTunes, then you most likely have a logic board issue. You could send it (or find a local) to a repair shop that specializes in micro-soldering repair.
