After changing a new screen, the iPhone 6 can't display, maybe most of us happens this situation, this article aims to provide a efficient way. We have to disassemble it, we connected it with DC Power supply, the diode data of display socket and iPhone display IC output are normal. But when we check the motherboard current output, the value shows abnormal, so we doubt there exist some failure in motherboard.
The current reached 100mA when press the power button. After remove the display tube, the current still the same, which means there is a short circuit. Measure the voltage output of each circuit of power supply with Fluke 15B+ Digital Multimeter, then surprised to find that there are really short circuit places.
LD010 is short circuit; we suspect that the filter capacitance on the circuit has been penetrated. After remove the iPhone power control IC, we found it is ground short circuit. Open the WUXINJI Dongle to check the iPhone schematic circuit, we found that this circuit is the display card image transmission MIPI data bus power supply.
Picture 14-10-1
CPU breakdown, the iPhone 6 doesn't display is possibly caused by physical damaged that the iPhone display screen electrostatic breakdown the CPU internal video card part. Put it under the 7-45X 180X Stereo Zoom Microscope, adjust the stable voltage to 1.5V, and then shock this circuit. At the shock moment, the power meter current jumps to more than 500 mA and then becomes 0. Shock it again, the current is not responding. Measuring the diode data shown is 180.
Picture 14-10-2
Install the main power, and then connect it to DC power supply to turn it on, the current not start from 100mA, but start from normal data 60mA. Assemble the iPhone display screen to test; now the iPhone 6 can be displayed normally.
Picture 14-10-3
No comments:
Post a Comment