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820-3209A backlight problem

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  • 820-3209A backlight problem

    I can't figure out.
    tested fuse diode mode 0.0016 is it ok?
    PPVOUT_SW_LCDBKLT_FB diode mode 0.621 is it ok?

  • #2
    Did you read the sticky on this subject?

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    • #3
      What voltage do you have on backlight output?

      0v?

      1.2v?

      8v?

      19v?

      27v?

      50v?

      Comment


      • #4
        PPBUS_SW_LCDBKLT_PWR i'm geting 8.1V is it good?
        LCD_BKLT_EN 3.3V
        BKLT_PLT_RST_L 3.3V
        Q9706 pin 4 i'm getting 8154V and pin 3 i'm getting 2.66V
        PPVOUT_SW_LCDBKLT 8.12V
        Last edited by john; 06-11-2016, 05:39 AM.

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        • #5
          BKL_EN 0V
          ​any suggestions
          Last edited by john; 06-11-2016, 05:47 AM.

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          • #6
            Resistance to GND on BKL_EN?

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            • #7
              fix it R9731 and R9715 was the problem. replace it and i have imagine. it's running slow but it might be the ssd

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              • #8
                Run ASD and check for errors. Running slow is usually a sensor issue.

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                • #9
                  I can't run anything. It took around 2 minutes to boot up. it's running very slow. The keyboard it's working perfect but when I press the option key so I can boot from stick it's not working. on the battery icon i have a X so it doesn't recognise the battery. any suggestion where i have to start the troubleshooting

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                  • #10
                    Your keyboard is not working fine! Connect external USB keyboard and use that to boot from USB. Run the EFI version of ASD.

                    This will probably turn out to be a dead SMC because the battery is not recognized. Try a known good battery first of course.

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                    • #11
                      changed new battery. the same thing x on the battery but now if i take the charger out it using battery power. used external usb keyboard the same issue. the keys are working but when i hold options nothing.
                      did reset the SMC. Shout down the mac and pressed options+ctrl+shift+power button for a few second when i release the buttons the charger it changes the light from orange to green and back to orange. reseting the nvram not working.

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                      • #12
                        Did you disconnect the internal keyboard, it probably has a stuck key.

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                        • #13
                          shift key is stuck order a new keyboard any advice about the battery I replaced 3 batterys and the same issue

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                          • #14
                            Probably a dead SMC or ISL6259, SMC most likely.

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                            • #15
                              tested with ASD and it give me a error SMC should I reflow it or replace it?

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