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Macbook Pro A1425 820-3462 (No Green/Orange Light)

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    #1

    Macbook Pro A1425 820-3462 (No Green/Orange Light)

    Hello there. I've got an issue with my Macbook Pro A1425 820-3462 with no green/orange light when plug in. Also I was unable to boot with the battery plugged in. When I change the DC-in board to another spare one I had, it show orange light and boot up with fan spinning, without the battery plug in. But it will randomly just not showing the magsafe light and the system become slow and the fans just when erratic all of sudden

    Here's the voltage I've measured based on the guide I've read :

    Original DC-in board (no green/orange light, no fan spin) :

    SYS_ONEWIRE - 0.96v
    ADAPTER_SENSE - 0.96v
    SMC_BC_ACOK_VCC - 3.41v
    SMC_BC_ACOK - 3.11v
    PPBUS_G3H - 12.58v
    PP3V42_G3H - 3.43v
    SMC_RESET_R_L - 3.12v

    Replacement DC-in board (green then orange light, able to boot but will randomly lose magsafe light and fan become erratic before not be able to boot unless plug out the charge and plug it back in) :

    SYS_ONEWIRE - 2.86v
    ADAPTER_SENSE - 2.86v
    SMC_BC_ACOK_VCC - 3.41v
    SMC_BC_ACOK - 3.11v
    PPBUS_G3H - 12.58v
    PP3V42_G3H - 3.43v
    SMC_RESET_R_L - 3.12v

    *Both test were done without battery connected else the macbook will sometimes not turn on with the battery connected

    May I know what you guys think of the problem here? What else do I need to check? I'm suspecting could be corrosion under smc.

    Any help is appreciated. Thanks
    Last edited by aahazim; 03-14-2021, 02:46 AM.
    Tags: None
    #2
    Re: Macbook Pro A1425 820-3462 (No Green/Orange Light)

    Look like SMC problem to me.

    Comment

      #3
      Re: Macbook Pro A1425 820-3462 (No Green/Orange Light)

      Originally posted by MobileXT View Post
      Look like SMC problem to me.
      Yeah, it does looks like it based on my google search (watched many louiss rossmann videos). Do you think it could be corrosion under the smc? or just the smc chip itself going bad?

      Comment

        #4
        Re: Macbook Pro A1425 820-3462 (No Green/Orange Light)

        Originally posted by aahazim View Post
        Yeah, it does looks like it based on my google search (watched many louiss rossmann videos). Do you think it could be corrosion under the smc? or just the smc chip itself going bad?
        Try reflow the SMC first.

        Comment

          #5
          Re: Macbook Pro A1425 820-3462 (No Green/Orange Light)

          Originally posted by MobileXT View Post
          Try reflow the SMC first.
          I see. May I know at what temperature estimated to be use for the reflow? I'm afraid to be applying too much heat that it will kill the SMC

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