Macbook Pro A1708 820-00840-A WiFi issue

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  • bossix
    New Member
    • May 2019
    • 3
    • Romania

    #1

    Macbook Pro A1708 820-00840-A WiFi issue

    Hey guys!
    I have bought this A1708 820-00840-A Macbook which had some water damage as it can be seen in the attached picture. I found one shorted cap and a blown backlight driver. After starting it up I have noticed that bluetooth is working but wifi isn't working. I began troubleshooting the problem and here's what I found:
    PP3V3_S4_WLAN is present
    I have 3.4V on SMC_WIFI_PWR_EN
    I have 3.3V on AP_RESET_L
    Diode mode readings seem to be normal, no other shorted or open lines found.
    I concluded that the fault must come from the wifi chip itself, either corrosion under the chip or the chip itself.
    I pulled the chip off just to find that the pads were looking absolutely fine and that there was no corrosion.
    I went ahead and replaced the chip with another one, but that didn't fix the problem. Bluetooth is working but wifi not...
    This is where my knowledge ends and where I have decided to ask for help.
    So you are more than welcome to chime in with your expert opinions and advises!
    Attached Files
  • bossix
    New Member
    • May 2019
    • 3
    • Romania

    #2
    Re: Macbook Pro A1708 820-00840-A WiFi issue

    Is it possible that the wifi chip is somehow paired to the motherboard, like in iPhones?

    Comment

    • oemelectronic
      Member
      • Sep 2019
      • 33
      • peru

      #3
      Re: Macbook Pro A1708 820-00840-A WiFi issue

      I have the same problem with a Similar A1707, it did not have blacklight. solutions the light problem and now you have bluethooh and no wifi.
      I did everything. reballing the wifi module, I put another module and nothing
      the Master MON2 told me to check input voltage in IC U3710 and it does not have..if help us friends..
      Attached Files

      Comment

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