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Recent content by Moss

  1. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    I noticed that constant cyclic reboots from the battery. I thought that by deleting 7462 I disabled the connection to the cpu but you are probably right, this is CPU
  2. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    when I remove something from the GND_DDRREG_SGND line, voltage immediately appears on 3 pin
  3. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    replaced again u7400 again (donor u7600) - no changes.
  4. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    pin 16 have 3.3 when I put c7450 in place, 0.6 disappears! I removed the C7415, which is not a good idea, but I saw that pin 6 became 2.5 instead of 1.8 and 0.8 appeared on pin 3. I replaced the C7415 but the situation has not changed.
  5. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    if you keep in mind that there must be a signal between these lines, it is!
  6. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    Ok I replaced the donor c7450 with the same one (0.22uF)! (C7450 / 62) = but were good. I can't find the XW7400 / 60 and how can I check them?
  7. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    Ok, thx I just removed did not connect (C7450 / 62), now on C7450 0.6v! pin 17/U7400 = 3.2v maybe i need to press the chip when soldering (for xw7400)?
  8. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    can i remove the 7462 and 7450 and connect them with a wire from one to the other? I don't know if there is a need if they do not touch GND?
  9. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    Yes, I took the BIOS from this forum (but I also put 2 bios from donors). can you advise Post Card Testeur for macbook? Removed 7462 and 7450 (0.6v appeared on it). replaced , i put it in its place C7450 and 0.6 disappears!!!! thx
  10. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    HI. I replaced the BIOS firmware with a clean Me Region but no changes. Could you tell me how to find that Me region is clean, I looked at the 400 and 2400 lines (I have it written that it starts with 2000 and this is true, but at 2400 I only have FF FF). Thx
  11. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    Replaced again 7400 and BIOS chip (from a new doner), no changes maybe supply 0.6V power to this line?
  12. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    yes I changed from a donor
  13. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    still no changes
  14. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    Thanks for the tip. 1 and 3 = 0.2, 5 = 1.02 I also checked the resistance: 1 and 3 = 0.8. 5 = 2.7
  15. M

    Macbook Air A1466 2015 no chime, no image (PP0V6_S0_DDRVTT)

    U7400, pins 1, 3, 5 there are no short circuits on these lines (infinity). On all these legs, a strange value of 596.5, I don't know what it is, but it's not 0 like in other cases. It still does not give 0.6V.
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