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苹果 iPhone 5c 于2013年9月10日发布。该设备的维修与以前的型号相似,需要螺丝刀和撬机工具。提供GSM或CDMA / 8,16,32 GB /白色,粉红色,黄色,蓝色和绿色。

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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. 在已经存在的问题里加入图片

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Android 维修工具包

一个新的屏幕或电池就在一个套件之内。

现在开始购物

Android 维修工具包

一个新的屏幕或电池就在一个套件之内。

现在开始购物

1 Answer

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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