Mac Air A1466 not starting

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • smic717394
    Senior Member
    • Jun 2017
    • 95
    • Spain
    #1

    Mac Air A1466 not starting

    Hi guys,

    I have a Mac air A1466 2015 8GB, it came dead, no light on charger, nothing. The current on the psu was about 45mah. After reflowing the SMC, not I get light on the charger, its charging the battery, cpu has 1,8V, ram vas voltage, ssd too. So when pressing the power button with the battery in the current jumps to about 1,8A, without the battery, when its off, its about 40mah, pressing the power goes to agout 500mah, cpu gets warm, ram too, but no fan spin and no image. I know its coming on because I see the current change on the psu.

    The cpu has about 6,8ohm, and all other have high values, could it be the smc, or is there anything I can check

    Thank you.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 14720
      • Canada
      #2
      What is the voltage of PPBUS_G3H to ground? Is the voltage here stable?

        Comment

        • smic717394
          Senior Member
          • Jun 2017
          • 95
          • Spain
          #3
          PPBUS_G3H with the battery connectes has 7,5v that is the battery voltage, with the battery disconnected is 8,574v measured on F7140 other voltages

          P3V42: 1,2v
          PP3V42: 4,4v
          P3V42G3H_Boost: 9,3v
          P3V42G3H_SW: 4,4v
          PPVIN: 17,3V
          P3V42G3H_SHDN:17,3

          5V present
          PCH has 1v
          CPU on each of the 2 coins has 1.8v
          3,3V present

          CPU gets mad hot, fan not coming on, screen not coming on

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 14720
              • Canada
              #4
              Review this flowchart:

              G3 to S3 State for Ivy Bridge Haswell and Broadwell - LogiWiki​

                Comment

                • reformatt
                  Badcaps Legend
                  • Feb 2020
                  • 1534
                  • Australia
                  #5
                  6 ohms sounds too low. What speed is the CPU? Normally at least 10 ohms or more for 1.6 or 1.8G CPU so cpu could be damaged.

                    Comment

                    • piernov
                      Super Moderator
                      • Jan 2016
                      • 4439
                      • France
                      #6
                      Probably measured when warm. Better reball SMC than just reflow. Could need a replacement.
                      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                        Comment

                        Previous template Next

                        Related Topics

                        Collapse
                        • tranquility
                          Onkyo TX-NR809 – no hdmi, DTS or NAND chip ? stuck at starting kernel
                          by tranquility
                          Hello,
                          i want to repair an Onkyo TX-NR809 receiver.

                          symptoms:
                          on power on, display appears and i hear one click. enue functions is given.
                          - no hdmi output
                          - audio output not tested, but i think it is not there
                          - usb sticks are not recognized

                          if i read out the chips with display+standby button + tone+
                          both dts show only ????

                          chip is D830K013BZKB4

                          things i have done:
                          - reflow of the dts chip without taking off and reballing
                          - changed the aluminium caps without the big one with 25v because i dont...
                          08-25-2025, 01:04 AM
                        • psdavid65
                          A1466 820-3437-B Bios Problem
                          by psdavid65
                          I received a 2013 Macbook Air A1466 A1466 820-3437-B motherboard WITHOUT a bios chip. I got a new bios chip and reprogrammed it. Macbook now powers on but doesn't boot the SSD. I've flashed a ton of bios but still same problem. Windows installation works with this Macbook but never a mac installation. Unfortunately, since I didn't receive this macbook with a bios chip, I don't have the original bios. What can I do now?
                          06-18-2024, 05:26 AM
                        • ravi_1617
                          Lenovo B540 ,Starting Problem
                          by ravi_1617
                          Hello !
                          Model Lenovo B540
                          Board Details 09244-1
                          LA14 DIS MB
                          48.4DMO4.01.1
                          This Board has starting problem , when CMOS batter is removed ,it starts (turn ON) by itself fine, than if is short power switch once board turns OFF Fine.
                          when connected CMOS dont start.
                          3.3 volts present at power switch (it slight less 3.267-87) .there was slight liquid spill at around U53 (SL62872HR),when I clean that area . I mean when its little hot board warm , board starts few time ON and OFF by power switch
                          One more thing i want to mention ( by mistake i started at...
                          10-14-2025, 02:08 AM
                        • PeteH
                          Dell Precision 5520 / LA-E331P r2.0 starting into CPU-failure
                          by PeteH
                          Hi everyone,

                          I have here a broken Dell Precision 5520 / LA-E331P r2.0 to play with
                          I found the schematics for r1.0, but not for r2.0.

                          The situation
                          - the laptop turns on, but the screen stays black -> the dell diag-LED shows the blink pattern for "CPU failure"
                          - the voltages close to the CPU stay at low
                          - I don't see any hotspots on the PCB (thermal imaging camera)
                          - some spots/areas on the PCB indicate some kind of liquid "damage"

                          Before I start digging though 70+ pages of schematics, maybe somebody...
                          10-12-2025, 07:54 AM
                        • hoarderteks_kyriakos
                          Dell Latitude E5570 - No display, turns off after a minute of pressing the power button.
                          by hoarderteks_kyriakos
                          Hello.

                          Yesterday my mother encountered a problem with her laptop, which led to it not turning on and expressing the behaviour mentioned in the title (you press the power button and then it turns off after a minute)

                          Here is what happened:
                          At one point i was fixing a setting on the laptop to make the laptop properly recognize the NVMe drive i put in months ago. All worked until all of a sudden the computer blue screened. The screen said it would reboot, but it never did. So she held down the power button, powering it off. Pressing it again, the screen briefly turned...
                          10-08-2025, 07:33 AM
                        • Loading...
                        • No more items.
                        Working...