Maco power supply schematic A-13395-7 - Maco Office Equipment & Supplies

To factory reset an iMac without a login or keyboard, you can try the following steps:

1. Boot the iMac in Target Disk Mode: Connect the iMac to another Mac using a Thunderbolt cable. Power on the iMac while holding down the T key. The iMac should appear as an external disk on the other Mac.
2. Reinstall macOS: Open the Disk Utility app on the other Mac and select the iMac disk. Choose "Erase" and follow the on-screen instructions to erase the iMac's drive. After erasing, quit Disk Utility and follow the on-screen instructions to reinstall macOS.
3. Restore from Time Machine Backup: If you have a Time Machine backup of the iMac, you can restore the backup to the iMac after reinstalling macOS.

If these steps don't work, you may need to seek assistance from an Apple Store or a professional repair service.

1 - Boot Single User (press Command + S) at boot (If you have MacOS installed on your hard drive).
2 - If you have a blank HD, then use the USB stick/Pendrive with the MacOS installer (El Capitan, Sierra or HighSierra).
2.1 - Press Option key at boot, Position the mouse on the MacOS installer icon.
2.2 - Press Command + S and keep holding these two keys.
2.3 - Click the MacOS installer icon -> continue holding the Command + S keys until you finish the MacOS installer Single User boot .
Enter these commands (change gpu-power-prefs to Intel GPU and boot verbose):
Code:
nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00 nvram boot-args="-v"
reboot
You can read the complete post here:
https://forums.macrumors.com/threads/force-2011-macbook-pro-8-2-with-failed-amd-gpu-to-always-use-intel-integrated-gpu-efi-variable-fix.2037591/
It's long and take time Good luck

With a brand name and model number you might get better results.
https://www.google.com/search?q=Schematics+for+power+supply&rlz=1C1GGGE_enUS385US385&oq=Schematics+for+power+supply&aqs=chrome..69i57.185461j0j7&sourceid=chrome&es_sm=122&ie=UTF-8

Schematics for power supply Google Search

I give up! Why would you need a schematic for a computer power supply? I've been in the computer business for over 30 years and have never needed a power supply schematic. Just curious!

if you think that you are able to do that
ATX:
http://www.pavouk.org/hw/en_atxps.html
http://datasheetoo.com/power-supply/300w-atx-power-supply-schematic-diagrams.html/attachment/300w-atx-power-supply-schematic-diagrams-2
Very simple one

Is better fix to buy on.Theirs a lot good inexpensive model.Best Buy,COMP USA,EBay,etc...

Service manual from SAMs does not include a schematic of the power supply board

Ah maco beams.Brings back memorys>
Anyway here is the manual with Schematics in pdf format
http://ok1ike.c-a-v.com/soubory/ant_txt/M103C.pdf

have fun and please rate.

Sean

http://www.helpwithpcs.com/courses/power-supply-basics-inc-pinouts.htm#atx-psu-pinouts