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[SOLVED]820-4924 Apple diagnostic shows wifi issue detected

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  • [SOLVED]820-4924 Apple diagnostic shows wifi issue detected

    Hello,

    I have a MacBook pro a1502 820-4924 that had some corrosion near U1950 area, I had replaced the gate, and a capacitor that doesn't look very good in that area. The computer powers on, but when we go to run the internet diagnostic, it won't let us launch Apple internet diagnostic, because it reports there is an issue detected with wifi. We tried a different WLAN card, and got same error. Where would be a good place to start to troubleshoot this?

    This is how the area looked before
    http://imgur.com/nOPQT1l

    This is how that corroded area looks now
    http://imgur.com/EMbT24R

  • #2
    Boot in OSX and see if it works first. Were you able to connect to WiFi in the boot menu?

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    • #3
      Gota check the I/O board and cable for damage.

      Comment


      • #4
        Sorry for late reply, got customers correct password, and in OSX it still says no hardware detected. I also tried the HDMI and the USB port that's on the same daughter board that the wifi card sits on and those work. So looks like still something I'm missing on the board. But not too sure where to start to track it down.

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        • #5
          Did you try a known good IO board/cable/airport?

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          • #6
            Yes, I just tried the IO board and WLAN card from the other 2015 13" retina I'm working on, and same results "no hardware detected"

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            • #7
              OK, so we got the wifi issue sorted. L9501 was missing, so got that replaced from donor. But the computer feels really laggy/slow trackpad. I ran diagnostics and it's showing following error:

              There may be an issue with the power management system REFERENCE Code: PPN001

              There may be an issue with the system management controller (smc)
              REFERENCE Code: PFM006

              Additional reference code :NDC001

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              • #8
                Sensor issue. Could be voltage or temp sensor. Install iStat and see if any sensors read funny temps.

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                • #9
                  OK, so I installed istat the one labelled "CPU System Agent Core" goes from 32 to 104 degrees, and keeps doing that. Not sure if that's normal. CPU vcore shows 1.64v, DC in 16.24v, pbus 12.79v

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                  • #10
                    Was the EFI ROM messed with? This could be an ME issue. I doubt the CPU is really running at 100C+, see if your finger burns

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                    • #11
                      Originally posted by dukefawks View Post
                      Was the EFI ROM messed with? This could be an ME issue. I doubt the CPU is really running at 100C+, see if your finger burns
                      This was brought in from another shop, their customer brought it in for this slow down issue, and the other shop broke the keyboard connector trying to troubleshoot the customer's computer. They brought it to us, we replaced the keyboard connector, cleaned up the corrosion, and replaced that missing filter for the wifi issues. But customer's initial complaint was this issue of the computer being very laggy. Also, the temperatures are in farenheit . I doubt the EFI was ever messed with

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                      • #12
                        PFM006 is either a trackpad sensor issue or the Airport sensor on the IO board. Check flat cables/connectors/trackpad, etc. They are on SMBUS_SMC_2 and 3
                        NDC001 is a camera error.

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                        • #13
                          Originally posted by dukefawks View Post
                          PFM006 is either a trackpad sensor issue or the Airport sensor on the IO board. Check flat cables/connectors/trackpad, etc. They are on SMBUS_SMC_2 and 3
                          NDC001 is a camera error.
                          yup, looks like that camera cable is causing this craziness. Probably not an easy way to replace the cable it looks like, besides getting a new display assembly?

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                          • #14
                            They fucked that up as well? No there is no way to replace the cable without fucking up the LCD. Well there is, but you really don't want to splice 8 miniature coax cables together.

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                            • #15
                              Originally posted by dukefawks View Post
                              They fucked that up as well? No there is no way to replace the cable without fucking up the LCD. Well there is, but you really don't want to splice 8 miniature coax cables together.
                              I don't think I'm going to take any more boards from other businesses, I'll stick to my walk-in clients, and fix what I can from there. Anyways, thanks for all the help with this one. I'll see what they want to do with this machine, I think we can mark this one as solved!

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