Apple iMac 21” Mid-2010 power supply test Ac Bel OT8043, Apple P/N 614-0444

Output diagnostic on a AC Bel OT8043 power supply.
Apple part number 614-0444
I AM NOT RESPONSIBLE IF YOU GET AN ELECTRICAL SHOCK WHEN WORKING ON THIS ELECTRONIC DEVICE!!!!!
Pin 1- ground
Pin 2- inverter
Pin 3 - ground
Pin 4- +12V standby permanent
Pin 5- ground
Pin 6- power supply on
Pin 7- ground
Pin 8- ground
Pin 9- inverter
Pin 10- +12V switched
Pin 11- +12V switched
Pin 12- +12V switched
Pin 13- +12V switched
Pin 14- ground

[@dolphindesign87]

Hello. The video was very useful for me. However, I saw a small mistake. In the research I did with my own power supply, there is a Logic level voltage on pins 2 and 9. The same voltages are also available on the 27-inch mac power supply. These pins are the i2c pins that go to the motherboard to determine the temperature values ​​of the power supply. SDA and SCL signals. I examined it with an oscilloscope and also looked at the schematics of both models. For the inverter, it receives voltage from the 12v 5VA pin on the 21.5-inch and GND is directly connected to the PSU GND line. However, they left a separate pin for the inverter on the 27-inch model. I wanted to make a small addition.

[@dogdev9385]

very good

[@silascardoso]

If after on the iMac, the voltage drops from 12v to 9.90v. Is it normal? Thank you.

[@pawelorlowski3515]

Hi. I have a very similar supply of iMac 27inch 2020 with 16 pin output connector . On the output pin 2 and 10 I have 1.1VDC. 0VDC on all other pins. That indicates that the power supply is broken. Nothing visually looks burnt on the power supply. What is your opinion? Please help.

[@pawelorlowski3515]

Sorry for my mistake. It's iMac 27 inch model 2010.

[@ct7ahv]

@@pawelorlowski3515 if you followed the test procedures on this video and you still have no output voltage, then your power supply is faulty. You can repair it or buy another on eBay.