Apple iMac G5 Power Supplies Capacitors

Apple iMac G5 Power Supply

Pictured above is an example of an iMac G5 power supply; yours might be different, and might not have the ambient light sensor shown above, which is attached to the bottom of some of the PSUs.

Below are three pictures of the various iMac G5 power supplies, with the internal printed circuit board exposed, after the metal covers have been removed. Read more about the do-it-yourself Apple iMac G5 power supply repairs and the Apple iMac G5 mother board repairs.

Information updated 09/17/09. I have everything in stock for the iMac G5 power supplies "A", "B", "C", “DD”, and “EE” style PSUs. Purchase the iMac G5 power supplies cap kits from the buy now links. These Apple iMac Power Supply P/Ns are specified with my specific “P/N” lettering system, not the official Apple Part Numbers.

The iMac G5 power supplies are listed below with a detailed picture of each PSU and the replacement values. Because of the large number of different iMac G5 Power Supplies, please compare your iMac power supply visually with the images below. There are differences on the capacitor values and quantities required for each of the PSUs listed below.

Power Supply “A”

Apple iMac G5 Power Supply 20 Inch “A” Style

11 Capacitors Listed

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. The 3300uf the longest life at 10,000 hrs. rating. Upgrade notice: Because of the difficulty in obtaining 10mm X 30mm 3300uf 10 Volts rated capacitors, I have upgraded this to the 12.5mm X 20mm 10 Volts rated capacitor. These 3300uf capacitors will fit into the space on the PSUs, but will stand above the circuit board slightly because of other components in the way at the base of the larger diameter capacitor. Note, the original 3300uf capacitors in my opinion were standing too high and shorting out on the top of the metal power supply cover as can be seen in the original trouble shooting section of the Apple iMac G5 Power Supply repair article. Note also, that some of the capacitors have been upgraded in voltage ratings. This was done as a matter of choice, in that a higher voltage is not necessarily required in the power supply, but where appropriate sizes were available in higher voltage ratings, I made the upgrade substitutions for extended performance and life expectancies.

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Power Supply “B”

Apple iMac G5 Power Supply 17 Inch “B” Style

9 Capacitors Listed

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. The 4700uf and the (1000uf 12.5mm 20mm 35 volt capacitor) are the longest life at 10,000 hrs. rating. Upgrade notice: Because of the difficulty in obtaining 10mm X 30mm 4700uf 6.3 Volts rated capacitors, I have upgraded the 4700uf to the 12.5mm X 25mm size 6.3 Volts rated capacitor. These 4700uf capacitors will fit into the space on the PSUs, but will stand above the circuit board slightly because of other components in the way at the base of the larger diameter capacitor. Note, the original 4700uf capacitors in my opinion were standing too high and shorting out on the top of the metal power supply cover as can be seen in the original trouble shooting section of the Apple iMac G5 Power Supply repair article I wrote. Note also, that some of the capacitors have been upgraded in voltage ratings. This was done as a matter of choice, in that a higher voltage is not necessarily required in the power supply, but where appropriate sizes were available in higher voltage ratings, I made the upgrade substitutions for extended performance and life expectancies.

I include a replacement chart showing the original value capacitor and the replacement value capacitor with your PSU cap order. Please refer to this chart when installing the new caps.

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Power Supply “C”

Apple iMac G5 Power Supply 20 Inch “C” Style

11 Capacitors Listed

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. The 3300uf and the (1000uf 12.5mm 20mm 35 volt capacitor) are the longest life at 10,000 hrs. rating. Upgrade notice: Because of the difficulty in obtaining 10mm X 30mm 3300uf 10 Volts rated capacitors, I have upgraded this to the 12.5mm X 20mm 10 Volts rated capacitor. These 3300uf capacitors will fit into the space on the PSUs, but will stand above the circuit board slightly because of other components in the way at the base of the larger diameter capacitor. Note, the original 3300uf capacitors in my opinion were standing too high and shorting out on the top of the metal power supply cover as can be seen in the original trouble shooting section of the Apple iMac G5 Power Supply repair article. Note also, that some of the capacitors have been upgraded in voltage ratings. This was done as a matter of choice, in that a higher voltage is not necessarily required in the power supply, but where appropriate sizes were available in higher voltage ratings, I made the upgrade substitutions for extended performance and life expectancies.

I include a replacement chart showing the original value capacitor and the replacement value capacitor with your PSU cap order. Please refer to this chart when installing the new caps.

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Power Supply “DD”

Apple iMac G5 Power Supply “DD” Style

9 Total Capacitors Listed

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. The 1000uf 12.5mm 20mm 35 volt capacitor is the longest life at 10,000 hrs. rating. Upgrade notice: I have upgraded some of the capacitors to higher voltage ratings. This was done as a matter of choice, in that a higher voltage is not necessarily required in the power supply, but where appropriate sizes were available in higher voltage ratings, I made the upgrade substitutions for extended performance and life expectancies.

I include a replacement chart showing the original value capacitor and the replacement value capacitor with your PSU cap order. Please refer to this chart when installing the new caps.

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Power Supply “EE”

Apple iMac G5 Power Supply “EE” Style

9 Total Capacitors Listed

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings.

Upgrade notice: Because of the difficulty in obtaining 10mm X 30mm 4700uf 6.3 Volts rated capacitors, I have upgraded the 4700uf to the 12.5mm X 25mm size 6.3 Volts rated capacitor. These 4700uf capacitors will fit into the space on the PSUs, but will stand above the circuit board slightly because of other components in the way at the base of the larger diameter capacitor.

** Note the replacement value of the different voltage rating 1000uF caps (three 6.3 V and one 10 V) to a total of four 1000uF 16 volt caps. These 1000uF caps are slightly taller but will clear the top cover of the PSU.

Also note the original 4700uf capacitors, in my opinion, were standing too high and shorting out on the top of the metal power supply cover as can be seen in the original trouble shooting section of the Apple iMac G5 Power Supply repair article I wrote. Note also, that some of the capacitors have been upgraded in voltage ratings as I have said before. This was done as a matter of choice, in that a higher voltage is not necessarily required in the power supply, but where appropriate sizes were available in higher voltage ratings, I made the upgrade substitutions for extended performance and life expectancies.

I include a replacement chart showing the original value capacitor and the replacement value capacitor with your PSU cap order. Please refer to this chart when installing the new caps.

Order Your Proper iMac G5 Power Supply Capacitors Kit

Match up your power supply with the power supply above. Double check your capacitors against the capacitor lists above before placing your order at my eCommerce Out West Store. If you don’t see your power supply displayed here, I suggest you contact me first before placing the order. All orders and secure payments are processed with Secure Google Checkout and allowing you to use any major credit card of your choice for purchases.

When installing the new capacitors, the positive lead is the longer lead, and the negative lead is the shorter lead. The capacitors have a long wide line printed on the side, that matches up to the negative lead on the capacitor. This must be properly aligned with the proper holes on the power supply printed circuit board. Make sure the capacitors are installed properly. The circuit board is typically marked with a circle of where the capacitors mount, and the positive or negative terminal is also indicated on the PCB. *Warning: If you install the capacitors in backwards, they will become damaged or explode when the unit is turned on. Making this mistake, can also damage other components in your iMac. So, pay attention, and be careful. If you are not sure, take a picture of your own power supply before you start working on it, so you can reference the old ones with the new ones.

I suggest you replace one capacitor at a time, so you do not mix up which one goes where. Another warning. Don’t make this mistake of installing them in the wrong location, because the power supply will not function properly.

In addition, be aware that there are surface mount components on the bottom of the PCB. Be careful when soldering. A standard 60/40 or lead free rosin core solder may be used. Do not use acid core or acid flux with your solder. Damage to the circuit board will result if you use the wrong solder core type.

Please be aware that not all the power supplies can be repaired with just the capacitors being replaced. Sometimes a power supply blows something else besides the capacitors. Diodes, rectifiers, transistors, resistors, and surface mount components can go bad because of the iMac G5 capacitor failures. I will say this though, there is a high degree of success in replacing the caps on the Power Supply Units. The caps on the PSUs are actually easier to unsolder and solder on the printed circuit board as compared to the MOB caps.

Labels: iMac, PSU

posted by Jim Warholic @ 4/02/2009 08:39:00 PM www.pwebs.net

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