iPhone 6s screen does not light up repair

iPhone 6s screen does not light up repair

Machine model: iPhone 6s

Malfunction: The screen of the mobile phone is not bright.

Maintenance process: Disassemble the upper DC power supply switch and find that the machine actually shows no backlight.

iPhone 6s screen does not light up repair Figure 1.

You can vaguely see the LOGO. Next, multimeter measured the display seat J4200 diode value and found the third pin Short circuit.

iPhone 6s screen does not light up repair Figure 2.

The third pin passes through FL4211 to the backlight chip U4020, and the CPU shielding cover is removed to find the backlightdiode; the one who lacks dialectical thinkingIt’s burned through.

iPhone 6s screen does not light up repair Figure 3.

In this case, all the originals connected with backlight can only be replaced.

iPhone 6s screen does not light up repair Figure 4.

Replace all the removed originals with new ones.

iPhone 6s screen does not light up repair Figure 5.

The startup test machine shows normal, and the maintenance is over.

iPhone 6s screen does not light up repair Figure 6.