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Repair information and guides for the Apple iPhone 5c that was announced on September 10, 2013. Model: A1532, A1456

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Looking for a short on VCC MAIN, injected 4.2v blew component

Title pretty much sums it up. I soldered a wire to a cap near the pmic. I hooked the positive up and heard pop and saw a little puff of smoke.

I had a diode reading on vcc main of 0.152, thats why i tried to inject voltage, but as soon as i did the voltage limiting on my dcps kicked in and voltage went to 0 while amps went to 5.16.

The strange thing is that i went through each component and cap on main but didnt find the fried component. Any ideas on what happened, this is the first time ive injected voltage into a line so im unclear on safe voltages to find a short but not blow it off the board.

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pts8091 post a good picture of where you soldered to the Cap. with your question. That way we could try and trace the circuit and see if we can find the smoked component. Adding images to an existing question

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I am all for injecting power during troubleshooting but you also need to have a fused power protection that will blow before the item you are working on blows. I am not a phone technician so I would recommend a small fuse, say .5A, to start out and increase the size as you gain more experience or see that a 2A fuse still allows components to go up in smoke. If you have an adjustable power supply with current limiting that start that out at a low current potential and increase as needed for safety.

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