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iMac Intel 27インチ EMC 2309 (Late 2009, Core 2 Duo 3.06もしくは3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHzもしくは Core i7 2.8 GHz) ID iMac11,1

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Won’t start up

Hi can anyone advise please?

my iMac won’t start up. I have mains power to the psu and the following DC output voltages on pins 1 to 16 But nothing else picture sounds etc it’s completely dead.

psu board ref ADP-310 AF B 614-0476 China

Pin 1 earth

pin 2 2.7mv & 1.2v when output plug disconnected

pin 3 earth

pin 4 11.92v

pin 5 earth

pin 6 1.1mv & 3.6 v when output plug disconnected

pin 7 earth

pin 8 earth

pin 9 earth

pin 10 2.8mv & 1v when output plug disconnected

pin 11 11.92v

pin 12 11.92v

pin 13 11.92v

pin 14 11.92v

pin 15 11.92v

pin 16 earth

ps. Pins 2,6,10 dc voltages increase when DC output plug disconnected

both large capacitors 300 v dc

Does anybody have the wiring diagram or details of the actual figures for testing my psu before I purchase a new?

Looking forward to some replies ;)

thanks for your time

paul Williams

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Hi I just received my new power supply unit and I’m gutted I still only have 1 light on my board while viewing in the dark from the lower vents ;(

regards

paul

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Paul

I,ll save you the trouble. See Diagram below. The are four diagnostic LED’s located on the logic board. The LED meanings are as follows, but if LED #1 and LED #2 are on then the power supply is OK. You can only see the LED’s through the vent holes to the left of the memory modules on the bottom of the iMac. I had to make the room completely dark to be sure if they were on or not. All of mine were off and I tested that there was power coming out of the cable and into the imac with a multi meter

Block Image

LED Functions

LED #1

• Indicates that the trickle voltage from the power supply has been detected by the main

logic board. This LED will remain ON whenever the iMac is connected to a working AC

power source. The LED will remain on even when the computer has been shut down or

put to sleep. The LED will turn off only if the AC power source is disconnected or the power

supply is faulty.

LED #2

• Indicates that the main logic board has detected proper power from the power supply

when the computer is turned on and that logic board voltage regulators are functioning

properly. This LED will be ON when the computer is turned on and the power supply is

working correctly.

LED #3

• Indicates that the computer and the video card are communicating. This LED will be ON

when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON

and you heard the startup sound, but LED 3 is OFF, then the video card might be installed

incorrectly or need replacement.

LED #4

• Indicates that the computer and the LCD panel are communicating. This LED will be ON

when the computer is turned on and video signal is being generated. If the LED is ON and

there is no image on the display, then the LCD panel, the LED backlight board, or the cables

between might be installed incorrectly or need replacement.

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Hi, many thanks for taking the time to send me all this information. I did notice recently during complete darkness that I only have 1 Led on while looking through the bottom vent ;( so that would confirm then that my PSU is not working;) that’s amazing

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Hi there, new psu fitted and still only 1 led light on and it doesn’t fire up ;( any recommendations? Thanks

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Paul what number LED is on. ? You mentioned that you have one LED light on which indicated the PSU is faulty. I don't think that is the case because the description for LED 1 ends with “. The LED will turn off only if the AC power source is disconnected or the powersupply is faulty.” which to me infers that the only time the power supply can be considered faulty is when ALL the LED lights are off.

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Paul williams さん、ありがとうございました!
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