You should try another power source.
Any experienced technician knows that these are not eternal and if the equipment has been operating with the original PSU for more than 5 years, it is very likely that it is the source of malfunctions, even more so if the iMac comes with a discrete configuration.
I bet iMac fails due to lack of power (typical failure).
Getting your hands on the motherboard is the last resort, if you don't know what you are doing, the motherboard can be completely unrecoverable.
If you are going to handle the inside of the iMac, wear thick rubber gloves, be careful of electrical shock, and remember to remove the AC cord from the outlet.
If you don't have another source to test, perhaps you can rebuild the original by replacing some components. If this is the case, write down the pcb number and send it to see if I have the schematic diagram for testing.
Greetings Colleague!
Any experienced technician knows that these are not eternal and if the equipment has been operating with the original PSU for more than 5 years, it is very likely that it is the source of malfunctions, even more so if the iMac comes with a discrete configuration.
I bet iMac fails due to lack of power (typical failure).
Getting your hands on the motherboard is the last resort, if you don't know what you are doing, the motherboard can be completely unrecoverable.
If you are going to handle the inside of the iMac, wear thick rubber gloves, be careful of electrical shock, and remember to remove the AC cord from the outlet.
If you don't have another source to test, perhaps you can rebuild the original by replacing some components. If this is the case, write down the pcb number and send it to see if I have the schematic diagram for testing.
Greetings Colleague!
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