The last 3 of 4 letters or numbers (the EEE code) is the version number of the PSU.
#MAC PRO POWER SUPPLY TEST SERIAL NUMBER#
However, given Grant's comments, I'm inclined to think the power supply has failed.įor anyone replacing a Mac Pro 1.1 power supply, be advised: You have to match part of the serial number as well as the part number of the replacament power supply.
#MAC PRO POWER SUPPLY TEST HOW TO#
In none of the attempts were any sounds heard (e.g., power switch relay) and pressing the diagnostic LED button each time resulted in no LEDs illuminating.Īfter about 6 hours of reading related threads and articles, I still haven't come across any info stating how to diagnose further when no diagnostic LEDs illuminate (including Apple's own manual). following the Apple manual and other power related threads. I did not notice any failure symptoms as I was using a different computer at the time. Can a failed logic board still illuminate the diagnostic LEDs? If a failed logic board cannot illuminate diagnostic LEDs and no LEDs are lit, then it it may be more likely the logic board is the problem.įWIW, the computer is used regularly and the power failed occurred yesterday while powered on.
At this point it is difficult to tell if it is power supply, logic board, or both. However, it would be nice to know if a failed logic board can still illuminate the diagnostic LEDs. Given there is no trickle power it is likely the power supply. Power Supply Model: DPS-980AB A Rev: 01F (Manufactured by: Delta) From this, can anyone tell how to test the power supply (short jumpers?)? Found attached image of power supply pinouts. Removed power supply and tested the fuse. I don't have trickle power, so is that logic board, power switch, or power supply? What is odd is it does not state what the source of problem is if there is no trickle power.
LED 7 should be green when the DIAG_ LED button is pressed, indicating that the main power is OK and within regulation. Plug in AC power cord, and press the power-on button on the front panel. LED 1 should be yellow when the DIAG_ LED button is pressed, indicating that trickle voltage is present.ĭiagnostic LED 7 indicates that the main power is OK and within regulation. If the computer still doesn’t power on, follow the procedure outlined below to determine whether the issue is related to the power supply.ĭiagnostic LED 1 indicates the presence of trickle power required by the logic board to begin the startup process. If the system fails to power on, rst reset the SMC as described in this chapter. To power on, the computer’s logic board requires “trickle” power.
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