Got the iPhone 6 which needs to repair iPhone 6 LCD screen ,according to the attached file, we knew the phone has no display after boot. Still we need to adhere three steps to fix it.
Measure the diode data of display socket J2019 with Fluke 15B+ Digital Multimeter, there is no exception found in data. Measure the power supply output of iPhone display touch IC, there is no short circuit. When measuring the bootstrap voltage, we found there is no voltage.
Picture 12-4-1
When we measure diode data, we found that C1554 had no short circuit, but also no resistance. In normal case, C1554-1 this one end can measure more than 600, the reverse resistance C1554-2 this one end can be measured to more than 600. We initially suspected that the display IC is virtual welding, after replanting the tin with QUICK 861DW Hot Air Rework Station, it doesn't work. Now, our suspicions are disconnected. Remove the display touch IC, and then measure the display touch IC C4# pin and E4# pin to the C1554 these two lines, all is disconnected.
Picture 12-4-2
C1554 on the back, the distance of the welding jump wire is far. In view of aesthetic, so we directly weld the jump wire near the display touch IC C4 # pin and the E4 pin.
Picture 12-4-3
After that, install the iPhone 6 and test it, the iPhone touch screen is displayed properly now!
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