I have an Apple MDD Power Supply made by ACBEL, model number API1PC36 that is failing to turn on.
I have not replaced the capacitors yet, because I was hoping to learn a little more about the unit without just throwing parts at it.
I have read through this thread a few times, and made it to the point where he was checking Pin 2 of Opto M8, where I ran into an issue.
When checking pin 1 and pin 2 prior to jumpering on, I see 5.4vDC or so on both pins, when I jumper on, the fans twitch and both pin 1 and pin 2 go low. At first I thought this was a good sign, until I realized that not only do they go low, but all voltages are lost.
Checking the voltages from the motherboard connector I find the 25v gone, as well as the 5 volts gone.
Before I just go replacing all the caps, does anyone have a good starting point and or procedure for testing a few things? I don't mind replacing the caps, I just don't want to do it only to find they were not the original problem.
Thanks!
I have not replaced the capacitors yet, because I was hoping to learn a little more about the unit without just throwing parts at it.
I have read through this thread a few times, and made it to the point where he was checking Pin 2 of Opto M8, where I ran into an issue.
When checking pin 1 and pin 2 prior to jumpering on, I see 5.4vDC or so on both pins, when I jumper on, the fans twitch and both pin 1 and pin 2 go low. At first I thought this was a good sign, until I realized that not only do they go low, but all voltages are lost.
Checking the voltages from the motherboard connector I find the 25v gone, as well as the 5 volts gone.
Before I just go replacing all the caps, does anyone have a good starting point and or procedure for testing a few things? I don't mind replacing the caps, I just don't want to do it only to find they were not the original problem.
Thanks!
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