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820-00165 - No WiFi hardware installed

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  • 820-00165 - No WiFi hardware installed

    I have this 00165 that won’t detect WiFi card.

    After a PRAM reset it detects and works for around 30 minutes and then goes back to not detecting. I can then make another PRAM reset and it works again for another 30 minutes and the story continues over and over.

    I already tried another known good WiFi card...

  • #2
    Inspect for corrosion around U3540 and the SMC itself.

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    • #3
      History? Liquid?

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      • #4
        No liquid. According to the customer WiFi just stopped working one day. No corrosion to be found after inspection. It has been to another repair shop who offered a logic board replacement. Only thing I noticed when taking apart was that the WiFi card was a little bit looser than normal when taking it out of socket connector. Probably because the other repair shop had taking the card in and out a thousand of times. I replaced the connector but problem is the same.

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        • #5
          U3550 looking all clean? I've had corrosion appear there on seemingly perfect boards.
          FlexBV - http://pldaniels.com/flexbv

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          • #6
            Looked clean yesterday when inspecting from the top. I’ll have a closer look at it from the side later today.

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            • #7
              No corrosion at U3550. Also PP3V3_WLAN is ok at 3.3V all the time both when the machine detects but also when not detecting the WiFI card.

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              • #8
                Check AP_RESET_CONN_L, AP_CLKREQ_L and SMC_WIFI_PWR_EN.
                Also check CLK100M presence at J3501.

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                • #9
                  AP_RESET_CONN_L = 0 (3.3 when working)
                  P_CLKREQ_L = 0 (3.0 when working)
                  SMC_WIFI_PWR_EN = 3.4

                  CLK100M not present

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                  • #10
                    "P_CLKREQ_L = 0 (3.0 when working)"
                    Are you sure???
                    AP_CLKREQ_L should be low.
                    We don't want active reset, but we want active clok request; both have _L at the end.
                    Check if AP_CLKREQ_Q_L is low; must be tied to ground on airport card.
                    Consider changing U3540.

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                    • #11
                      I will double check it and get back

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                      • #12
                        Thanks for the effort. Customer got another board. I still have this board here and I will post again if I ever get back to it....

                        Thanks again

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