Macbook Pro A1708 820-00840-A WiFi issue

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • 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
    Tags: None
    • 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

            Previous template Next

            Related Topics

            Collapse
            • rounin
              MacBook Air A2337 (820-02016) USB-C Port Issue – Only Works in One Orientation (CC Line Problem?)
              by rounin
              Hi everyone,

              I'm working on a MacBook Air 2020 (A2337, board 820-02016) and running into a strange USB-C issue. I've gone through quite a bit of testing and part replacement, but I'm stuck — hoping someone here can shed some light.

              🛠 Original Issue
              The machine initially wouldn't negotiate 20V over USB-C — stuck at 5V.
              Diagnosis showed PP1V5_UPC0_LDO_CORE shorted to ground.

              I replaced U3100 (UF400) using a donor board (A2179), and the machine powers on fine now.

              ⚠️ New Problem: One USB-C Port Only Works in One Orientation...
              04-19-2025, 01:18 AM
            • ResetReality
              Toshiba/Vestel 58UL2B63DB Wifi Issue???
              by ResetReality
              Hello fellow tech heads.

              Had this tv come in...issue stated reboots on wifi.

              Indeed it does. However, with wifi off or using cat 5 cable no reboot issues.

              So far ive changed mainboard and wifi module...also reset tv back to factory via service menu (4725)

              Still same issue... i do have a psu to swap but cant see it being that really as works flawless if wifi is disabled

              I thought fireware? But why only on wifi?

              Is it an issue with the memory cache filling up and having to reboot for more ram??

              At a total...
              07-04-2024, 12:28 PM
            • Riananyaina
              MacBook A1708 820-00840-A backlight issue
              by Riananyaina
              Hello Everyone ,

              today I'm coming to you regarding my issue which is no Backlight .

              I have image on my screen but no light .

              The macbook was one that I bought few month ago that I used with an external screen . Now I started to do some analysis on the MB which my limited knowledge .
              First thing is that it suffered from liquid damage . The fuse was not ok when I openned it the first time . But I already changed it after testing that there is no short to ground on this line .

              Please find below few informations which can help for the analysis...
              04-24-2023, 05:03 AM
            • Instafixx
              Macbook A1708 820-0040 Camera Issue
              by Instafixx
              Hello,
              Namaste.

              I have this Macbook A1708 830-00840 with a No Camera Issue.
              System Report says that no video capturing device is attached.
              Installed a known good display assembly with working front camera but still the same.
              The motherboard is clean. No Liquid Damage.

              Can anyone help?
              05-08-2023, 06:26 AM
            • pcbmaniac
              MacBook A1278 (3115) No PPBUS_G3H Issue
              by pcbmaniac
              Subject: Help Needed: MacBook A1278 (3115) No PPBUS_G3H Issue

              Hello everyone,

              I'm working on a MacBook A1278 with the 3115 logic board and facing an issue with no PPBUS_G3H voltage. Here's what I've checked so far:
              1. U7000 Measurements:
                • Pin 3 has 0V, even though R7012 shows 16.5V from PPDCIN_S5_CHGR.
              2. Resistors:
                • I measured R7010 and R7011 with one leg disconnected, and both tested OK.

              Based on these findings, I believe U7000 needs to be replaced. However, I have a related question:
              • If I also decide to replace the SMC, do I need to order it pre-programmed,
              ...
              12-02-2024, 04:12 PM
            • Loading...
            • No more items.
            Working...