I have an iMac (white) 20" // 4,1 generation.
Lately it only runs for a couple minutes before powering off. Just like the power has been cut. After which it won't turn back on again unless left alone for a good few hours.
I removed the power supply and took it into work. We do basic electronic repair here. But I'm no electronics engineer, more a dabbler ... good with an iron, but not so hot on fault finding ...
With a little help, I've determined that it is the PSU that is faulty. Under load here (on our test rig) it runs for a couple minutes and then turns off, just like it does when in the iMac.
The part numbers for this PSU are as follows:
Apple PN: 614-0363
Celetronix PN: APP-22-LFM33
I've replaced 4 out of the 5 output caps (didn't have the correct type on hand here for the fifth) though none are bulging / showing signs of wear.
Can anyone give any pointers or hunches on what might cause this PSU to run and stop in this manner?
Anything I could check in particular?
Many thanks in advance,
Jay
Lately it only runs for a couple minutes before powering off. Just like the power has been cut. After which it won't turn back on again unless left alone for a good few hours.
I removed the power supply and took it into work. We do basic electronic repair here. But I'm no electronics engineer, more a dabbler ... good with an iron, but not so hot on fault finding ...
With a little help, I've determined that it is the PSU that is faulty. Under load here (on our test rig) it runs for a couple minutes and then turns off, just like it does when in the iMac.
The part numbers for this PSU are as follows:
Apple PN: 614-0363
Celetronix PN: APP-22-LFM33
I've replaced 4 out of the 5 output caps (didn't have the correct type on hand here for the fifth) though none are bulging / showing signs of wear.
Can anyone give any pointers or hunches on what might cause this PSU to run and stop in this manner?
Anything I could check in particular?
Many thanks in advance,
Jay
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