The next phone is occurred LCD Screen has no display and no light after boot.
While it was changed the kit before, sounds terribly...
But we will take some effective and procedure measures to fix it ,following the steps:
1. Measure the working condition of iPhone LCD display IC, all is normal. Then measure the display socket J2019 with Fluke 15B+ Digital Multimeter, we found the #3 pin is short circuit. 90_AP_TO_LCM_MIPI_DATA3_N MIPI image transfer data bus leads directly to CPU, the initial diagnosis is that the CPU is continuous tin or internal damage. As shown in Picture 11-9-1
2. Remove iPhone CPU and then measure this signal line, we found it is the earthing short circuit, which is CPU internal damage, the kit is damaged. 6P and 6 are not the same size; the circuit design is also not the same. By analyzing the WUXINJI schematic diagram, we found the solution.As shown in Picture 11-9-2 and picture 11-9-3
3. According to the comparison of WUXINJI schematic diagram, we found that iPhone 6 Plus has one more a set of MIPI image transfer data bus than iPhone 6, 90_AP_TO_LCM_MIPI_DATA3_P、90_AP_TO_LCM_MIPI_DATA3_N, and iPhone 6 doesn't have that line. Because the iPhone 6 only needs to display 4.7 inch images, but iPhone 6 Plus needs to display 5.5 inch images.
4. The faulty iPhone 6 Plus is 90_AP_TO_LCM_MIPI_DATA3_N short circuit, we decided to abandon the 5.5 and install the 4.7 directly. Move the CPU on this fault board to iPhone 6 motherboard, the iPhone LCD can display now！
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