a1278 no green light

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  • 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 β€˜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 β€˜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
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