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Repair information, troubleshooting tips, and guides for the sixth iteration of Apple iPhone, announced on September 12, 2012. Model: A1428, A1429

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Doesn't boot, charge, not detected on pc/mac

In simple words it doesn't boot, charge, not detected on PC. I think this device has changed a few repair shops given the "internal" arrangement of components (battery definitely has been tinkered with, screws misaligned etc). Owner told me that the problem lies at the lighting port assembly + power button is a bit hit or miss, must be pressed hard (the whole flex thingyS, and probably that's what every repair person told him lol) but I measured on the flex cable pins and I got a steady voltage when connected to charger or PC.

Now my question. Supposedly that lighting port assembly is OK, when connected to charger/pc etc on the main board on battery connector between the first and last pin out of 4 total there should be some voltage about 3.5+ volt right? But there is none, zero, nothing. Even with full battery phone doesn't boot. Seems to me that the board is fried. I don't want to throw money for new lighting port assembly or power flex assembly just to learn that the main board is fried.

Any tips are welcome. Thanks

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Borche Gjeorgiev , I think you got your answer already:-) "Even with full battery phone doesn't boot." which it should, even with a bad lightning connector unless it shortens out the board, which is unlikely. I'd suggest that you remove the logic board and only attach the bare essentials like a known working lightning connector and a good display assembly as well as home and power button. Make sure that your power flex is okay. It should start with that. If it does not, you are pretty much guaranteed to have logic board issues. Possible damage from using the wrong screws, so check your board extremely careful. If it does start add the other components one at a time and see what works and what does not. Never assume anything and test every component. Supposing and assuming in a case like that will lead you down the wrong path.

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It sounds like the logic board probably has a short somewhere. There are ways to find out where it might be but first it is probably best to look over the board under some sort of magnification and see whether you can notice any damaged or knocked off components.

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