![replace mac pro power supply disassembly replace mac pro power supply disassembly](https://computerrepairdallastexas.files.wordpress.com/2020/02/apple-mac-pro-repair-service-dallas-1-e1580582053409.jpg)
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. I took it to the local Apple store and they told me that the power supply was bad. The PSU did make a slight ticking noise during this time, but nothing too alarming. (Some have mentioned repair prices near the price of a new Mac Pro system.) (added June 2, 2009, from May 30 - June 10th mails) 'I have a Power Mac Pro G5 Dual 2.5 GHz. 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. This indicates the PSU is working to some extent. 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.
![replace mac pro power supply disassembly replace mac pro power supply disassembly](https://i.ytimg.com/vi/9_YFqGLET58/maxresdefault.jpg)
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.