Solutions for iPhone 6S turn on failure after replacing the card slot

Fault Description:  iPhone 6S happens slot shrapnel is broken and can't read SIM, the peers blew it blind.

While after we checked, we found the card slot is not repair well so that the machine can't be turned on.

The customer said to me that the phone can be turned on but have no display, I feel that this is not the real fault. When power-up, test with digital multi-meter, the current is 100 and have no change, and we start to repair after communicating with the customer.

The iPhone can be online, DFU mode, which should be due to blowing the card slot too over resulted in iPhone NAND flash pseudo-soldering, and there is no brush machine at start.

P1

Disassembling the NAND flash with QUICK 861DW Hot Rework Station, we found a useful electric A5 pin, the point on the NAND flash is big, it will be fine by flying a line from the side capacitor to fill the curing.

P2

The NAND flash tested no problem, reforest tin again, and test the resistance of the bottom board before installing the NAND flash. Install the NAND flash after confirm that there is no problem. Turn on the iPhone, the phone go into the system normally. Next, the we need deal with card slot, it is difficult to remove the card slot, but simple to install. The card slot removal can be opened with several fixed pin through the hot air gun, or the professional stainless steel scissors , clip the outer case gradually.

P3

Since the original card slot have damaged, we can remove it from the discarded board in high temperature. This will ensure the integrity of black glue inside the card slot. When install the slot card aligned pin pressed with the tweezers set. I use low temperature tin, so blow from the front won't affect the NAND flash on the back. After loading the card test, the card read, signal, and call function are normal.