Fault Description: iPhone 6P touch screen half dark while it can receive call while it will become no display once in a while.
As we only received an iPhone motherboard. so the first step we took is to check it with multimeter, the result shows it was repaired ever while iphone backlight also was replaced. And one of the capacitor was lost, we should treat it seriously.
Following the solve way and detail pictures:
Picture 11-6-1
Now we directly remove the yellow insulation tape, cleaning up the repaired place, and then supply power on it to test, the left backlight is dark.
Picture 11-6-2
After using the QUICK 861DW to weld the capacitor that didn't install before, turn it on and test it, now the backlight is back to normal, it can display normally. According to check the WUXINJI circuit diagram, we know that the backlight is a step-up capacitor, if none of this; it can't boost the voltage, so the backlight is not bright.
Picture 11-6-3
Picture 11-6-4
After fixing the backlight, we also need to repair the screen sometimes display but sometimes doesn't display issue. Sometimes it can display when you press the socket with your hand, so we thought it was a problem with the socket. However, after careful examination, we found that the socket has been replaced, and the pin also is fine, now we have to check its circuit.
After testing, we found that there is no display power supply -5.7V. As we know, -5.7V is directly output by the iPhone screen display , testing the line, it is normal. So we decided to replace the display IC directly. After the replacement, turn on the iPhone, now the iPhone screen works normally!
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