a1278 no green light

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Arshad alam4659
    Senior Member
    • Aug 2020
    • 156
    • India
    #1

    a1278 no green light

    i have a a1278 820-3115-b with no green light some measure volt
    PPBUS_G3H=12v
    PP3V42_G3H=3.43v
    SMC_BC_ACOK=3v
    SMC_BC_ACOK_VCC=3.4v
    SYS_ONEWIRE=3.46v
    ADAPTER_SENSE=3.42v
    someone help i try with original charger
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14334
      • Canada
      #2
      [SOLVED]820-3115 no green light but PPBUS and 3V42 present. | Rossmanngroup Forums

        Comment

        • Arshad alam4659
          Senior Member
          • Aug 2020
          • 156
          • India
          #3
          Originally posted by mon2
          [SOLVED]820-3115 no green light but PPBUS and 3V42 present. | Rossmanngroup Forums
          Thanks smc is bad i changed with new one now board is ok

            Comment

            Previous template Next

            Related Topics

            Collapse
            • jheunne
              a1278 820-2936a fan spin green light only help
              by jheunne
              hi there i have a macbook pro a1278 board 820-2936a no boot no dispaly only fan spin and green light. i seen some corroision on top starting to u4900 to u3890 i manage to clean it but still no luck to boot. i figure out that in pp15v t29 there is no available out voltage it shows only 0.6 volts only...
              10-24-2024, 04:19 AM
            • MOSSEP
              Monitor Audio RSW12 - Green light, but no sound
              by MOSSEP
              Hi

              Im hoping someone might be able to give me some idea of what may be wrong with my Monitor Audio RSW12 Sub.

              Ive owned it since new in around 2002, so would really like to keep it running if I can, it was the first ‘decent' bit of audio equipment I ever purchased and is a little sentimental.

              The issue I had was that it would power up with the red light, but sometimes the green light would not come on and I would get no bass from it. If the green light did come on though, I would get sound out of it.

              I have already tried replacing all of the...
              01-26-2025, 08:33 AM
            • MOSSEP
              Monitor Audio RSW12 - Green light but no audio
              by MOSSEP
              Hi

              Im hoping someone might be able to give me some idea of what may be wrong with my Monitor Audio RSW12 Sub.

              Ive owned it since new in around 2002, so would really like to keep it running if I can, it was the first ‘decent' bit of audio equipment I ever purchased and is a little sentimental.

              The issue I had was that it would power up with the red light, but sometimes the green light would not come on and I would get no bass from it. If the green light did come on though, I would get sound out of it.

              I have already tried replacing all of the...
              01-26-2025, 08:18 AM
            • lcdcaps1
              820-2610-A Sys onewire help, no green light. Please help from the gurus
              by lcdcaps1
              Hi

              I have an 820-2610-A motherboard that has no green light.
              I have noticed is when I do a SMC reset the light on the Magsafe blinks.
              From My understanding, the sys onewire circuit is responsible for the green light on the magsafe
              The sys onewire circuit on this model and others is more involved
              I was hoping if anyone knows about this and how it works, can reply and let me know
              I know this is an old model but I am sure there are people who still works on these or knows about them

              I get 1.1v on the C7771 capacitor and will replace...
              11-06-2023, 01:28 PM
            • franjr
              MacBook pro A1278 (820-3115-B) green light no power on
              by franjr
              Hi, I have a MacBook pro A1278 (820-3115-B) that has green light on the charger and does not turn on, the fan does not spin.
              The voltages in the SMC seem correct. I have made voltages measurements on the main coils and I put their measurements here:
              L7220..........3.3V
              L7260...........5.12V
              L7330..........1.5V
              L7030..........12.67V
              L3895..........2.5V
              L7760..........1.80V
              L9701..........0V

              In the following coils they give me continuity with ground, which seems strange to me:

              L7550,L7510,L7520........ 0V
              ...
              01-30-2023, 04:24 PM
            • Loading...
            • No more items.
            Working...