SOLVE: iphone 6 Plus "Unknown Error" issue - vipprogrammer

If your iphone 6 Plus appeared unknown Error, The iphone 6 Plus is not able to be turned on and the constant current is 70mA, For this question，we should buy some good phone repair tools helps our fix Cell Phone. You can read famous China Brand Universal Programmer Online Shop, all of  phone repair tools, and you can find it. Let’s follow the vipprogrammer offer guide fix your iphone.

The previous problem was unresponsive touch. When soldering touch chip, the front camera socket dropped because the air gun had higher temperature. After soldering front Camera FPC Connector socket, found that the front camera still could not be used.  blew the area near fingerprint socket. It cannot be turn on completely.

Customer only sent the motherboard, so energize it and test. The constant current is 70mA and it stops.

Based on my experience, constant current stops at 70mA mainly because of the bus.  go on to measure the diode data of bus voltage. The data is normal. Many reasons can lead to turn on failure. If we want to narrow the problem scope, we can use root method. The customer agrees me to root. It reports unknown error (4005). Based on my experience, I know that CPU or temporary storage, as shown in the picture.

The major point of soldering CPU lies in the treatment to the top of the CPU lower board, as shown in the picture.

After soldering the CPU lower board, assemble the iPhone and test. The current is normal. continue to assemble the temporary storage, finding that the current still stops at 70mA, which is abnormal. Obviously the problem lies in temporary storage, as shown in the following picture. Then turn it on to test. All the functions are normal. Trouble is removed.

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