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Measuring iMac G5 Power Supply Voltages at Connector Plug Pinouts




Exactly how how do you test the PSUs out on the Apple iMacs? How do you turn on the iMac G5 power supply when it is out of the computer? iMac G5 Power Supply Connector – P-1 1. +3.3 – BlackA3B 12. +3.3 – BlackA3B 2. +3.3 – BlackA3B 13. +12v – BrownA3B 3. GND [...]






Click to read more about: Measuring iMac G5 Power Supply Voltages at Connector Plug Pinouts

Exactly how how do you test the PSUs out on the Apple iMacs?
How do you turn on the iMac G5 power supply when it is out of the computer?

Apple iMac G5 PSU With Ambient Light Sensor Shown

iMac G5 Power Supply Connector – P-1

1. +3.3 – BlackA3B 12. +3.3 – BlackA3B
2. +3.3 – BlackA3B 13. +12v – BrownA3B
3. GND – BlackB4B 14. GND – BlackC4B
4. +5v Gray/PurpleA4B 15. On/Off – Gray
5. GND – BlackB4B 16. GND – BlackC4B
6. +5v Gray/PurpleA4B 17. GND – BlackC4B
7. GND – BlackB4B 18. GND – BlackC4B
8. PG – Blue 19. +12v – BrownA3B
9. +5.1Vsb – Purple 20. +5v Gray/PurpleA4B
10. +12v – BrownA3B 21. +5v Gray/PurpleA4B
11. GND 22. +20v to +24v – Brown

On the 661-3350 power supply and other similar PSUs, jumper pins 15 (gray) and 16 (blk/gnd) to turn the PSU on. With the power supply on, you should be able to read all the voltages listed above with a DC voltage meter. Between pins 22 and any GND pin, you will see approx. 24vdc, which is needed for the backlight. Note that the plug is numbered on the wired side of the connector plug. You will need some good lighting to see the numbers. A small flashlight comes in handy.

When reading the voltages, it is always a good idea to check both for proper DC voltage and AC ripple voltage. Note that AC ripple voltage should be relatively low, in the low millivolts range.

From what I have been able to tell, the other power supplies in both the 17 inch and 20 inch iMac G5 computers all used the same DC voltage pinout arrangements. I believe the voltage pinout arrangements are different on the Intel iMacs and some of the iSight models.

Please read the detailed information for repairing Apple iMac G5 power supplies.

Note: (see below) PG acronym represents the Power Good signal and VSB represents Voltage Stand By.

If anyone has more information for any of the power supplies (especially the pinout arrangement) used on the various Mac products, including the various PPC models, Intel Models, and Power Macs, please send it to me.

Thank you.

Regards,

Jim

Voltage pinouts listed above cover the following Apple PSUs: 661-3350, 661-3289, 614-0353, 614-0296, 614-0297, 661-3351 614-0923 614-0352 614-0294, AP14P46, 614-0398, 614-0326, 661-3625, 661-3289, AP13PC97, 614-0279, DPS-180SB, A 614-0334, 614-0366, 614-0326, 614-0398, 614-0353, 614-0328, 661-3627, 614-0327, 614-0325, 614-0365, 614-0329, 661-3290, Manufacturer Part Numbers: DPS-180QB-1A Rev 01, API4PC47, DPS-180QB ) along with a number of different manufacturers including: (ACBel API3PC96 – Celetronix Q45B – NPFC), and additional manufacturers’ part numbers than what is listed here.

PG acronym represents the Power Good signal. I found the following reference in the Wikipedia when it comes to talking about power supplies in general for PCs.

In addition to the voltages and currents that a computer needs to operate, power supplies also provide a signal called the Power-Good signal, sometimes written as Power_OK or Power_Good or you can distinguish it by its gray color. Its purpose is to tell the computer all is well with the power supply and that the computer can continue to operate normally. If the Power-Good signal is not present at startup, the CPU is held in reset state. If a Power-Good signal goes down during operation the CPU will shutdown. The Power-Good signal prevents the computer from attempting to operate on improper voltages and damaging itself.

The ATX specification defines the Power-Good signal as a +5 volt (V) signal generated in the power supply when it has passed its internal self-tests and the outputs have stabilized. This normally takes between 0.1 and 0.5 seconds after the power supply is switched on. The signal is then sent to the motherboard, where it is received by the processor timer chip that controls the reset line to the processor.

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iSight G5 Apple Mother Board 820-1766-A




Pictured below are the capacitor locations and values for Apple iMac G5 iSight Mother Board 820-1766-A motherboards. For high quality, low ESR, computer and switching power supply grade, long life, high temperature rated, and high current rated capacitors, go to www.jwestsales.com, your source for the Apple in you. Note that there are at least two [...]






Click to read more about: iSight G5 Apple Mother Board 820-1766-A

Pictured below are the capacitor locations and values for Apple iMac G5 iSight Mother Board 820-1766-A motherboards.

iSight 1145

For high quality, low ESR, computer and switching power supply grade, long life, high temperature rated, and high current rated capacitors, go to www.jwestsales.com, your source for the Apple in you.

Note that there are at least two different iSight G5 models with different logic cards. Take a look at this one to confirm which model iSight you have.

Click the following link to purchase the iSight Mother Board Capacitors Kit.

Here is a down-loadable procedure for G5 iSight dis-assembly which can take you all the way down to and including the iSight motherboard removal.

Regards,

Jim Warholic

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Apple iMac G5 iSight Logic Board 820-1783-A




Pictured below are the capacitor locations and values for Apple iMac G5 iSight Logic Card 820-1783-A motherboards. For high quality, low ESR, computer and switching power supply grade, long life, high temperature rated, and high current rated capacitors, go to www.jwestsales.com, your source for the Apple in you. Click the following link to purchase the [...]






Click to read more about: Apple iMac G5 iSight Logic Board 820-1783-A

Pictured below are the capacitor locations and values for Apple iMac G5 iSight Logic Card 820-1783-A motherboards.

iSight G5 iMac Apple Logic Card 820-1783-a
For high quality, low ESR, computer and switching power supply grade, long life, high temperature rated, and high current rated capacitors, go to www.jwestsales.com, your source for the Apple in you.
Click the following link to purchase the iSight Logic Board Capacitors Kit.

Here is a down-loadable procedure for G5 iSight dis-assembly which can take you all the way down to and including the iSight motherboard removal.

Regards,
Jim Warholic

Jim Warholic is President of Professional Web Services, Inc., an Internet marketing services company dedicated to helping B2B and B2C companies gain a larger online footprint through Internet marketing, SEO, online advertising, web branding, and strategic marketing to help companies increase their sales and improve their bottom line results. Prior to starting Professional Web Services, Jim has had a lifetime of experience and engineering expertise in the electronics field in circuit board drilling, routing, and electronics equipment maintenance and field service engineer repair services.

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