PSU produces all the right voltages when tested on the bench. Test LEDs suggest PSU replacement needed. Yet there are plenty of failed backplanes which manifest with the OVTMP CPU LEDs active.Īnyone have experience or ideas that could help me here? I don't want to throw good money after bad. However what irks me is that I can't find anyone else online describing this same fault condition. So what I see in front of me suggests that I need a new backplane. The PSU did make a slight ticking noise during this time, but nothing too alarming. All the pins appeared to match up with someone's hand drawn pinout found online. To do this I had to jump pins to get the PSU to start up, which it did. So finally, I have removed the PSU and used my multimeter to take voltage readings at each of the pins on the connector. I assumed this was an enclosure or shield for the power supply, but removing the plate. This indicates the PSU is working to some extent. Continuing the disassembly, I removed an anodized aluminum plate at the bottom of the G5. This successfully illuminates the 5V STDBY LED as expected. Incidentally if I press on with the diagnostics in the manual, it suggests pressing the DIAG button. It recommends testing with a known-good PSU as the more likely culprit.
#Replace mac pro power supply disassembly manual#
The service manual indicates this suggests failure of backplane board or PSU. Unfortunately neither of these illuminates when adding or removing the AC. I should see the OVTMP CPUA and OVTMP CPUB LEDs illuminate briefly, and again when removing the AC. I have followed the service guide's instructions to reduce the Mac Pro to its Minimum Configuration and plug in the power. The symptom is that adding a power cord and pressing the power button does nothing. I have a 2010 Mac Pro which won't boot and I suspect either the PSU or the Backplane (logic board / motherboard) has failed.
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