iMac no power even after replacing power supply, logic board, RAM, HDD and SATA cable

[deathstardan]

Hi All,

As stated above I have an iMac mid 2010 27" that I've damn near rebuilt and it still gets no power at all (no diagnostic LED's either!). I've done all of the keyboard combinations to reset things, not that they'll work because I don't have any power but thought it's worth a shot! Has anyone here experienced this too or have any ideas? My final idea is replacing the EMI filter but I thought I would ask around first...

[Chaniel]

It's been a LONG time since I've worked with any macs (although they were 2010 models so there's that!) but no diagnostic LEDs indicates a power problem.

 

1) Verify your power source - is the socket testing OK?

2) Verify the power cable - does it work well in another machine?

3) Verify the power supply connection to logic board

 

Where did the replacement power supply come from? Have you verified that it works in another machine?

 

If so, this is when I'd start getting out a multimeter to verify voltage/continuity. IIRC, the way iMacs worked is that the actual C14 socket on the back of the iMac fed a cable which then plugged into the power supply. I'd check that cable to see if you're actually getting AC to the power supply.

 

Only other thing I can think of then is it's going to be an issue between the DC Out of the power supply and the connection to the logic board. Can't remember enough specifics about how they were laid out really.

[deathstardan]

It's been a LONG time since I've worked with any macs (although they were 2010 models so there's that!) but no diagnostic LEDs indicates a power problem.

 

1) Verify your power source - is the socket testing OK?

2) Verify the power cable - does it work well in another machine?

3) Verify the power supply connection to logic board

 

Where did the replacement power supply come from? Have you verified that it works in another machine?

 

If so, this is when I'd start getting out a multimeter to verify voltage/continuity. IIRC, the way iMacs worked is that the actual C14 socket on the back of the iMac fed a cable which then plugged into the power supply. I'd check that cable to see if you're actually getting AC to the power supply.

 

Only other thing I can think of then is it's going to be an issue between the DC Out of the power supply and the connection to the logic board. Can't remember enough specifics about how they were laid out really.

Hi Chaniel,

Thanks for your reply!

The power source and lead work as I had my rig hooked up to it. The part is from eBay so it could very easily be faulty, I am in the process of returning it (PITA!!). I did some multimeter readings and had no voltage on any pins on the new or original power supply, I'd love to have tested it on another machine but I don't have one to test it on. I will just have to try and get my refund and then order a new PSU I guess!