How To Repair iPhone 7 Backlight Failure ?

If your iPhone 7 is having problems with a dim screen, it’s almost certain that the fault is related to the backlight. Such as the iPhone touch screen no display, the screen light is very dim or cannot adjust brightness and so on.
Fortunately, these "screen dim" backlighting problems can be fixed.
Just follow these steps can fix the iPhone 7 backlight.


First of all, please connect ZXW Dongle to your computer, and then open it to check iPhone 7 backlight power supply schematic diagram.

According to the iPhone schematic diagram, we know that the iPhone backlight boost IC output three sets of backlight power supply signals, they were PP_LCM_BLANODE (16.5V Cathode Voltage), PP_LCM_BL_CAT1 and PP_LCM_BL_CAT2, these three circuit signals are sent to the display interface via three inductors respectively.As shown in Picture.


These three inductors are vulnerable to damage, and then lead the iPhone has no backlight or unstable light, sometimes bright, but sometimes not. In this case, we can fix it with a short connection.

If there is no backlight on the iPhone 7, please use Fluke 15B+ Digital Multimeter to measure the diode data for PP_LCM_BL_CAT1, PP_LCM_BL_ANODE (backlight anode power supply) and PP_LCM_BL_CAT2, and put it under the Stereo Zoom Microscope to check the short connection on these three inductors, if they works well, they you can fix it by replacing iPhone backlight boost IC.
If you need any professional technical support and related iPhone repair tools,please do not hesitate to contact us on www.vipfixphone.com.

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