Ciao a tutti! I was given an old late 2013 iMac that doesn't turn on. I have the .brd file and the schematics and I've done a little analysis on the boards. Starting from the PS it appears to have 11.6V instead of 12V and that is a little strange, isn't it? Measured test points for PP12V_G3H and gives me 11.6V as well.
The iMac have two different types of behaviour:
1) no button pressed when inserting AC cable; inserting AC cable turns LED #1 on, when pressing power button LED #1 turns off for half a second, then turn on again, LED #2 turns on for half a second and then turns off;
2) pressing power button when connecting AC plug; no LEDs for 4-5 seconds then LED #1 turns on, LED #2 turns on for half a second and the fan seems to start spinning for half a second, then LED #2 turns off and fan stops spinning.
Could it be a power supply problem? What else can I test to be 100% sure?
The iMac have two different types of behaviour:
1) no button pressed when inserting AC cable; inserting AC cable turns LED #1 on, when pressing power button LED #1 turns off for half a second, then turn on again, LED #2 turns on for half a second and then turns off;
2) pressing power button when connecting AC plug; no LEDs for 4-5 seconds then LED #1 turns on, LED #2 turns on for half a second and the fan seems to start spinning for half a second, then LED #2 turns off and fan stops spinning.
Could it be a power supply problem? What else can I test to be 100% sure?
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