Excellent Solution: iPhone 6 Plus black screen issue

The iPhone 6 Plus is turned on, it shows black screen, the iPhone screen has no display. What's trouble? Here to get excellent solution. 

Put iPhone under the WL Aluminum Alloy Pad, and then replace the new iPhone display screen to test, it still shows black screen. Now, we can confirm that it's not iPhone screen problem, we need to check iPhone motherboard.

Tear down the iPhone motherboard, and then remove the iPhone motherboard. Frist measure the iPhone iPhone power supply with Fluke 15B+digital multimeter, nothing issues was found. 

Assemble the iPhone display IC, and then measure it, the boot current jumps abnormally.
We can see the backlight behind the screen is bright, the measurement of +5.7V power supply is only about 2.2V, -5.7V has no voltage. 

Now, we estimate the iPhone display IC internal boost exists problem, and the WUXINJI dongle circuit diagram shows that the capacitor C1554 energy storage booster capacitor is short circuited.

Use QUICK 861DW hot air rework staiton to remove the damaged capacitor, and then install the good capatitor to it.  Now, measure it agian, the data jumps normally.

Install the iPhone to test, now the iPhone screen works perfectly.