3/9/2024 0 Comments Fixing a mac pro power supply![]() If your Mac laptop starts charging after you plug the power adapter back in, this might indicate an issue with line noise (disruption caused by stray electromagnetic signals) from your power outlet. Unplug the power adapter from the wall, wait 30 seconds, then plug the adapter back in: If you're not using a Mac with Apple silicon, reset the SMC. If your Mac still won't charge, shut down your Mac and close the display for 30 seconds, then open the display and try to charge your Mac again. If the power outlet works, connect your USB-C power adapter and try to charge your Mac. Unplug your USB-C power adapter from the power outlet, then plug in a known good device, such as a lamp to confirm it powers on properly. Make sure that you've connected your USB-C power adapter to a working power outlet. This seems to be a board problem.If your power adapter isn't charging your Mac laptop, unplug the power adapter from the power outlet, wait a few seconds, then plug it back in. I expect Sierra installation will fail because it will not recognize that the machine is plugged into the mains. Machine boots up, fan at max speed, no backlight for keyboard, everything else seems to work. Process repeats when the capacitor gets enough juice to do it again.Ģ) Removed battery, disconnected charger, held power button for 10 seconds, connected charger while still holding power button for 10 seconds, released power button. If I had to guess, it seems the charger is "leaking" current into some capacitor that triggers the boot-up sequence, but there is just enough current to spin up the fan and DVD drive and it dies. ![]() Once the charger is connected, the machine is clearly trying to startup but not getting enough power and dies. Observations without battery as under:ġ) Removed battery, tried to perform SMC Reset (cmd+shift+option+power button) and power on. If those two are cleared, then the problem is hopefully just the DC board, BUT also possibly the mainboard? Beyond the battery and charger, I am not sure what else I can check. I figure I need to get another mac to check the battery and the charger first. I am unsure what my next diagnostic move is. I left it alone in this state for 30 minutes and discovered the bottom was quite warm, which means certainly a lot of power was being pumped thru the board, even though it was not booting up. However, the fan continues to constantly spin up, meaning the machine is constantly trying to power up unsuccessfully. If I shutdown from this condition, the machine again fails to power up and I have to repeat the procedure. Machine runs super cool because of the extreme thermal throttling. Kernel Task runs constantly and consumes all of the CPU power. HOWEVER, about a minute after the machine boots, it CRAWLS. Pushing the battery indicator button on the left side leads to a single flashing green light for five seconds. I managed to update to Sierra without any issues. On next spin up cycle, the machine now will successfully boot.īattery is detected, but does not charge.Ĭoconut Battery reports that the battery is in good condition. When the computer fails to startup and fan starts spinning down, plug the battery in ![]() Wait for the fan to start spinning up automatically (power is never pressed) Press and Hold Power Button to discharge any residual power After a day of experimentation, I have found that I can consistently boot up with the following procedure: The breakthrough was when I messed around with the battery. I was running Lion, and discovered that El Capitan would fail with installation errors and Sierra would tell me that the power supply needs to be connected (though charger was already connected). The computer boots as soon as I release (I do not need to press power again, it just boots), but now the fan is at max speed, and the battery is not detected at all. However, the old procedure, unplug the charger and hold power button for 10 seconds, connect the charger while continuing to hold the power button for 10 seconds, release, works. The correct SMC reset procedure, cmd+option+shift+ power button does not seem to do anything. I opened the back of the machine and discovered that the fan basically starts spinning when the magsafe is connected, but it does not receive enough power to actually boot up. When the magsafe is connected, it goes green immediately and the front sleep led starts blinking periodically. I have done all this and more and this question is about the issues that I have not been able to figure out after three days of researching this problem. The solution typically is to reset SMC and PRAM. ![]() On the surface, it seems like a common problem: Mac won’t turn on when magsafe is connected, battery is missing when it turns on, fan runs at full speed, etc. I have an early 2011 13” Macbook Pro that is exhibiting unusual power issues.
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