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iPhone 6 Plus half Back light

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  • iPhone 6 Plus half Back light

    i have an iPhone 6 plus with half backlight and touch disease, I repaired touch disease first and when I tried to repair Half back light by replacing U1580 boost since tp2559 showed 3v when powered on with LCD still half backlight, I already replace it twice. I also replaced chestnut. I also check the conector all is normal on diode mode no open line,. I cant seem to figure out why the voltage wont go up on

  • #2
    I double check continuity on all the line PP_LCM_BL34_Anode_conn and all is connected. wondering why I Only have 3V on this line.

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    • #3
      Instead only looking forshorts and opens, look for abnormal diode mesurents to a known good board

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      • #4
        Okay, let's start with a question for you on this one. The iPhone 6 plus. Does it have one backlight circuit or two? i.e. does it have one full set of backlight chip, coil, diode, caps, filter, or two full sets of these?
        Second question---did it have half backlight BEFORE you started your touch repair? Or did this only show up AFTER you put HEAT on the board?

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        • #5
          It already had half back light when i Got it. 6 plus has 2 back light circuit, I just replaced the backlight boost ic on the right side since I assumed that its the one responsible for voltages on the anode side.
          I double check continuity and all is good.

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          • #6
            Which side is working, the bl_anode or the bl43_anode side? I don't remember the correlation between left and right side. Replacing the driver without knowing what the fault was is not a good idea---you have to know what problem you're trying to solve and not just throw chips at a board.

            Diode mode in the connector and compare to known good board and use a known good screen.

            BL will always be main voltage (your 3v) unless backlight is working---backlight voltage readings are never a useful thing to do for iPhones.

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