Step By Step to fix iPhone 7P front camera failure

 Last week, we received an iPhone 7 Plus to repair, the problem is that this iPhone 7P front camera is not working, it won't take photos, just shows black. We fixed it step by step, here is the repair process.

Step 1

Get into IOS system and test the iPhone camera. The iPhone rear camera, flash and other functions are all normal, but the iPhone front camera is not working.

Step 2

Use phone opening tools to disassemble the iPhone, and then remove the iPhone motherboard.

Step 3

Put iPhone motherboard under the Stereo Zoom Microscope to observe,  we found the repair traces of front camera J4503 base. It means the iPhone 7 Plus was repaired before. As shown in picture 1.

Step 3 

Measure the iPhone motherboard by digital multimeter, the data tested is normal.  When measure the voltage of the 2 groups of I2C that were repaired: (R4810) I2C_NH_SCL_CONN and (4811) I2C_NH_SDA_CONN, we found R4811 resistance has no voltage, but it has value when trigger. The circuit diagram we can check on WUXINJI dongle.

Step 4

Now we can judge that R4811 is damaged, so we need to replace it. With the help of the QUICK 861DW and tweezers, we remove the incoming panel and replace the two pull-up resistors.

Step 5

 

Assemble the iPhone 7 Plus, power on iPhone 7P, and then test it, the iPhone front camera works perfectly.