MacBook does not turn on! hangs in recovery but cannot recover, error 21! please help with identifying the fault. consumption 20v/0.086A
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It may be the same fault as noted here:
My M1 Mac Can't enter recovery mode even … - Apple Community -
thanks mon2. following the forum advice i still get the error.Comment
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I tried all available cables but the error is always -1, according to the logowik ithis error indicates a problem with the trackpad?Last edited by PITERPENY; 10-27-2024, 11:03 AM.Comment
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sometimes I get another error 4017 (not on logiWiki)Comment
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Any other thoughts on what can be checked?
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Check your ssd power rail voltage. If not active, check the resistance to ground of the same power rail.Comment
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PP0V88_AWAKE_NAND_VDD=0.8V
PP1V25_AWAKE_NAND_VCCQ=1.25V
PP2V58_AWAKE_NAND_VCC=2.56V
everything seems to be ok with the ssd power supply?! I can turn the macbook on and off with the power button! The macbook plays the power-on music but the caps lock does not light up and I have nothing on the display! Also, when connecting the charger, there is a sound that it is charging and the consumption is 20v/1.5a!Comment
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There is no activity on the USB ports! Connecting an external monitor did not help!Comment
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No caps lock key toggle means the os has not booted.
You have a chime so that is a good start. Test with an external monitor using a type C hub with a HDMI port. See if you are able to see any graphics through this USB-c dongle.Comment
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finally the macbook was restored via dfu without errors and the macbook says something in spanish but there is no picture on either the external or internal display! there is no indication on the dongle! i think it is now on the recovery screen but there is no picture! maybe the problem is in the m2 processor? it does not give a picture? how to check the video outputs on the m2?Comment
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Any ideas why there is no display on the screen, no backlight, no keyboard backlight and the caps lock does not work?Comment
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No direct knowledge on this model yet but as I understand it - the DFU is like a backdoor to inject firmware onto the board. This operation does not guarantee that the parts onboard will make use of this firmware to boot as normal. That is, if something else is defective then this new firmware not be used to boot. Caps key lock toggle is only if the OS has booted. OS boot will be only if the CPU & SSD are ok as a minimum. Test each and every inductor on the board to confirm the power rails are ok.Comment
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What is the system written to when restoring via DFU? Isn't it written to the SSD? If the MacBook asks to select a language, but there is no image, can I exclude the SSD? Or is it better to remove and check the JCID P13 for reading and writing the SSD?Comment
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Hello,
Did you try to close lid when using external screen?
(You will not Get image in recovery With lis open)
Maybe try to boot/reinstall on external drive too, if this pièce of … Of t2 let you do this!Comment
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finally i localized the problem. ANGLE Sleep Sensor Cable. since no one suggested that i need to check the sleep cable, i didn't even know about its existence 😃. when searching for a display, i saw that some have a cable and checked mine under a microscope and was stunned! the capacitors were rotten. can someone help me identify these four capacitors? or maybe there is some kind of diagram?Attached FilesComment
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I removed the display sleep sensor and the MacBook immediately turned on but with horizontal lines. Will the lines go away when the cable is restored (replaced)? Or is this already a problem with the matrix and the entire display needs to be replaced?Comment
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If anyone is suddenly interested in how I got rid of the horizontal lines on this display and what happened to it, you can watch it on my YouTube channel. https://youtu.be/4L6XiIRbgfsComment
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I have A1932 that is going to internet recovery every time.
i tried nvram and smc reset but it looks that MacBook is not reacting to that.
i tried to restore it through DFU but it restarts in the middle of process and Apple Configurator does not show any error, just stays like in progress.
keyboard is working because I can connect to WiFi but internet recovery always fails with 2100 or 2003 error.
also won’t open option to boot from usb device.
and I noticed that is not possible to turn off the MacBook. It’s always turning on by itself.
...07-22-2025, 02:55 AM -
Hi, my dear friends., Maybe this might be a stupid question or something I missed or do not know. I have 2 MacBook Air A2681 (Indentical color & EMC #), both LCD screens broken. Before ordering the LCD Screens I confirmed both worked with their respective batteries & AC Adapters, & they did 100%. The LCD Screens came in today & I replaced LCD for the 1st A2681. (Removed Battery Terminal cable for both Laptops before installation of LCDs). Perfect Screen & Booted up fine. But it did not work with battery. I checked the battery connector & it was seated in well/perfectly.... -
Hello, i have a batch of 10 Macbook Pros A2179 bought from a Costco return wholesaler.
The 10 of them show the exact same behavior;
They auto power on, to internet recovery spinning globe, fans to 100%.
Power consumption on USB-C port is 0.43a, shuts down as soon as unplugged. Battery doesn't charge at all. However, it boots to 20V on the Ampmeter.
Based on their iBridge versions (4.x and 5.x) these were shelfed for a long time.
All of them power on the same way; 100% fans, shut down as soon as they are unplugged. Removing... -
I have an M1 MacBook Air (A2337) 2020 that came in for water damage and will not turn on. Upon opening it, I saw that the audio board was severely corroded. I disconnected it, and the device started working.
After that, I dealt with the issues on the audio board by removing the capacitors that were shorted to ground, and the device started working. However, I encountered another problem: I can't access the recovery options by pressing and holding the power button. I'm not sure if it's a hardware issue or if the recovery partition has been lost. Currently, the system's time isn't updating,... -
So, i dont know almost anything on macs..but this is my nephews so i had to try. Its 16 inch macbook pro from 2019...It all started when he left something on the keyboard when closing the mac and there it was the crack on screen. At first it was like working but later no. After that he told me that it wouldnt power on?...hear fans but nothing..tried like 100 of stuffs but nothing helped.
So, he bring it to me...first i open it and figured he did also. there was lots of dust i cleaned everything...and started it...the broken screen showed only backlight but nothing on the screen. I...
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