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- #MAC A1418 SERVICE MANUAL HOW TO#
- #MAC A1418 SERVICE MANUAL SERIAL NUMBER#
- #MAC A1418 SERVICE MANUAL PDF#
- #MAC A1418 SERVICE MANUAL MANUAL#
- #MAC A1418 SERVICE MANUAL SOFTWARE#
This complete guide will walk you through:Troubleshooting simple to complex hardware and software issues. At nearly 500 pages, it is far more exhaustive than any information publicly available.
#MAC A1418 SERVICE MANUAL MANUAL#
The complete Apple repair manual for your 27" iMac (Late 2012, Late 2013 and Retina 5K Late 2014)! I have personally used this guide to repair iMacs.
#MAC A1418 SERVICE MANUAL PDF#
FWIW, my power supply fuse tested OK, but the power supply PSU ON test failed.Item: 232512205007 iMac 27" 2012-14 (Retina 5K) - Apple Service Repair Manual - PDF Delivered fast!. If the fuse is good and the power supply is working, you can move on to testing other things. If you're multimeter reads "000" (and or beeps), the fuse is good (See: ) You can check the power supply fuse also with a multimeter set to the Diode setting (look for symbol similar to below). If there is no voltage (+3.3V or 5V, depending on pin), then the power supply may need replacing or a new fuse. Using a multimeter, place one probe on a powered pin (see diagram) and the other on a nearby ground pin. Unplug all four connectors so the power supply is isolated, but plug in the 120v power cable. Please reference attached diagram below and the "J4" connector in the previously posted diagram in post above. On the "C" connector, connect the PSU ON pin (#8 in diagram) using a paper clip or small jumper wire to a nearby ground pin to ground (#2, #5, or #10). You want to test the fourth unlabeled one, "C". There are four connectors coming from the power supply: J1, J2, J3, and a fourth unlabeled one (i believed call "C"). Power supplies can be dangerous so you are at your own risk! I'll look for a replacement power supply.įor those that would like to test this Apple DPS-980AB A power supply (for any power problem), this may help. These letters/numbers must match or the power supply may not correctly manage the cooling fans.
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The last 3 of 4 letters or numbers (the EEE code) is the version number of the PSU.
#MAC A1418 SERVICE MANUAL 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 A1418 SERVICE MANUAL 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.