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Apple iMac G5 Power Supplies Capacitors

Apple iMac G5 Power Supply

Match your power supply model to one of the pictures below. Open it up to visually compare. Please note that I have the model numbers listed as A, B, C, DD, and EE not by the Apple p/n.

There are actually lots of different Apple power supply part numbers with the same voltage pinout arrangement for iMac G5 computers including but not limited to: (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. Also, see iSight power supply below.

Apple Capacitors For Sale - Click Here

Trust me on this, the best way to figure out what you need is to match the pictures below with your actual power supply “inside views” when ordering a PSU capacitor kit.

Apple iMac G5 PSU Example

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

Below are pictures of the various iMac G5 power supplies, with the internal printed circuit board exposed, and 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. Here is a link for measuring the PSU voltages if you have a voltmeter available.

Everything is 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 (easy to visually identify) G5 PSU “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 cap values. Because of the large number of different iMac G5 Power Supplies, it is important to 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.

This article has been updated on 4/12/2011.

Power Supply “A”

Imac20PSU

Apple iMac G5 Power Supply 20 Inch “A” Style

11 Capacitors Listed

Capacitor uf Quantity Required Approx. Original Size Measured & Voltage Capacitors Replacement Upgrade
3300uf 1 10mm X 30mm 10 V 12.5mm X 20mm 10 V
2200uf 1 10mm X 24mm 10 V 10mm X 25mm 10 V
1000uf 4 8mm X 16mm 10 V 8mm X 20mm 16 V
1200uf 1 10mm X 24mm 16 V 10mm X 20mm 16 V
1000uf 1 10mm X 23mm 25 V 10mm X 23mm 25 V
330uf 1 10mm X 20mm 35 V 10mm X 12.5mm 35 V
120uf 1 8mm X 15mm 50 V 8mm X 15mm 50 V
22uf 1 5mm X 7mm 35 V 5mm X 11mm 50 V

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. The 3300uf cap is the longest life 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.


Power Supply “B”

imac-g5-psu-capacitors-locations

Apple iMac G5 Power Supply 17 Inch “B” Style

9 Capacitors Listed

Capacitor uf Quantity Required Approx. Original Size Measured & Voltage Capacitors Replacement Upgrade
4700uf 1 10mm X 30mm 6.3 V 12.5mm X 25mm 10 V
2200uf 2 10mm X 24mm 10 V 10mm X 25mm 10 V
1000uf 3 8mm X 16mm 6.3 V 8mm X 20mm 16 V
1200uf 1 10mm X 24mm 16 V 10mm X 20mm 16 V
1000uf 1 12.5mm X 20mm 35V 12.5mm X 20mm 35 V
330uf 1 10mm X 20mm 35 V 10mm X 12.5mm 35 V

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. The 4700uf is the longest life rated. 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 10 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.

Some of the other capacitors have been upgraded in voltage ratings too. 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.


Power Supply “C”

20inch-imac-psu-1st-gen

Apple iMac G5 Power Supply 20 Inch “C” Style

11 Capacitors Listed

Capacitor uf Quantity Required Approx. Original Size Measured & Voltage Capacitors Replacement Upgrade
3300uf 1 10mm X 30mm 10 V 12.5mm X 20mm 10 V
2200uf 3 10mm X 24mm 10 V 10mm X 25mm 10 V
1000uf 2 8mm X 18mm 10 V 8mm X 20mm 16 V
1200uf 1 10mm X 24mm 16 V 10mm X 20mm 16 V
1000uf 1 12.5mm X 20mm 25 V 12.5mm X 20mm 35 V
330uf 1 10mm X 20mm 35 V 10mm X 12.5mm 35 V
120uf 1 8mm X 14mm 50 V 8mm X 15mm 50 V
10uf 1 5mm X 7mm 50 V 5mm X 7mm 50 V

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. The 3300uf is the longest life. 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 slightly above the circuit board 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.

The caps have a significantly longer life rating than the originals, and will fit inside the case with no problems. As far a clearance in the case, it actually has approximately 31mm height capabilities from the top of the printed circuit board to the inside of the metal cover. 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.


Power Supply “DD”

imac-psu-new-version

Apple iMac G5 Power Supply “DD” Style

9 Total Capacitors Listed

Capacitor uF Quantity Required Approx. Original Size Measured & Voltage Capacitors Replacement Upgrade
1200uF 1 10mm X 24mm 16 V 10mm X 20mm 16 V
2200uF 2 10mm X 24mm 10 V 10mm X 25mm 10 V
1000uF 4 8mm X 20mm 10 V 8mm X 20mm 16 V
120uF 1 8mm X 14mm 50 V 8mm X 15mm 50 V
1000uf 1 12.5mm X 20mm 35 V 12.5mm X 20mm 35 V

Capacitors are all high quality, switching power supply grade, low ESR, and long life ratings. These caps have a significantly longer life rating than the originals, and will fit inside the case with no problems. The case actually has approximately 31mm height capabilities from the top of the printed circuit board to the inside of the metal cover. 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.


Power Supply “EE”

EE-PSU-iMac

Apple iMac G5 Power Supply “EE” Style

9 Total Capacitors Listed

Capacitor uF Quantity Required Approx. Original Size Measured & Voltage Capacitors Replacement Upgrade
4700uf 1 10mm X 30mm 6.3 V 12.5mm X 25mm 6.3 V
1200uF 1 10mm X 23mm 16 V 10mm X 20mm 16 V
2200uF 1 10mm X 23mm 6.3 V 10mm X 25mm 10 V
1000uF 3 8mm X 16mm 6.3 V ** 8mm X 20mm 16 V
1000uf 1 8mm X 19mm 10 V ** 8mm X 20mm 16 V
330uF 1 10mm X 20mm 35 V 10mm X 12.5mm 35 V
22uf 1 4.5mm X 12mm 50 V 5mm X 11mm 50 V

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.

 


Apple Power Supply Unit Model “S”

Apple iSight iMac PSU

Apple iMac iSight Power Supply “S” Style

6 Total Capacitors Listed

Capacitor uF Quantity Required Approx. Original Size Measured & Voltage Capacitors Replacement Upgrade
1000uF 1 10mm X 20mm 16 V 10mm X 16mm 16 V
2200uF 3 12.5mm X 25mm 16 V 12.5mm X 25mm 16 V
68uF 1 6.3mm X 11mm 25 V 6.3mm X 11.2mm 35 V
22uf 1 5mm X 11mm 50 V 5mm X 11mm 50 V

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

Note that one of the capacitors has 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.

low-esr-capacitors 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, however, be aware that the original solder on the circuit board was lead free solder, and the two different alloy types melt at different temperatures, which can easily result in cold solder joints when using a lead solder instead of lead free solder for reworking the board. 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. I do recommend using lead free solder for the best reworked solder joints. Refer to the lead free soldering tips article for more detailed information.

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.

LED Indicator Lights on Motherboard Main Logic Card

iMac G5 LED Indicator Lights

The LEDs on the main logic board (motherboard or MOB) indicate the following:

  • LED #1 means it is detecting trickle voltage from the power supply unit, PSU. If you don’t see this LED, with the machine off but plugged in, it is not a good candidate for PSU repairs unless fuse is blown on the PSU itself, and the PSU should be replaced in this case. Also note that seeing LED #1 on, does not mean the PSU is completely good.
  • LED #2 comes on when the MOB sees all the correct powers (proper voltages present from PSU).
  • LED #3 indicates the computer and LCD are talking (communicating) OK.
  • LED #4 is strictly an overheating indicator LED, and should not go on under normal circumstances.

Notice the slight bulging of the capacitors on the main circuit board above. This indicates that these are bad capacitors and the MOB capacitors should be replaced at this time. Keep in mind, both the PSU and the MOB caps can be bad at the same time. Refer to the repairing the iMac G5 article for more information.

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Category: iMac, PSU
  • Jim Warholic says:

    I suspect the PSU capacitors are faulty. As far as which kit you require, take a look at the various Apple iMac PSU listed here and match your up to the pictures. If you do not see your exact model, I suggest comparing the list of caps to yours.

    July 20, 2011 at 6:34 PM
  • Kevin says:

    Jim, I have this same G5 iMac and no power when plugged in. I hear what seems to be small electrical noises as soon as I plug the unit in, sounds like small electrical arching. Is that a noise a bad power supply would make?

    August 16, 2011 at 6:21 AM
  • Jim Warholic says:

    @ Kevin

    Yes, if the clicking is coming from the power supply, I suspect it is some sort of electrical arcing, maybe inside the small transformer, or the circuit is being electrically “clamped” off repeatedly due to a defective component. It would be wise to test the PSU on the bench, out of the computer, to verify what it does under no load. Suggest measuring the voltages this way if you can.

    August 16, 2011 at 8:56 AM
  • Rob says:

    My power supply is a C model, it all matches perfectly, except that when I started replacing the caps, number two is a 3300, not a 1200 as supplied in your kit. Have you seen this before, and what do I do? The board looks original, and the gray goop holding the caps in was undisturbed.
    Thanks.

    October 13, 2011 at 6:23 PM
  • Jim Warholic says:

    No, never have seen it nor heard of it before. I would be curious as to what is located at number three location. The number three location should have a 3300uF 10 volt cap, and the number two location should have the 1200uF 16 volt capacitor for the “C” model PSUs.

    October 13, 2011 at 6:54 PM
  • paul says:

    Hi Jim, Do you have a pinout for the iSight power supplies or know where to locate one?

    October 18, 2011 at 4:12 PM
  • Jim Warholic says:

    No, I haven’t seen the pinout diagram on the Apple iSight PSU models. Maybe someone will post it here or send me an email with the schematic diagram (even a hand drawn one would work too). Thanks in advance.

    October 18, 2011 at 4:17 PM
  • eric says:

    Hi,

    I have 2 iMac 17 iSight G5 and core2duo 2 Ghz : it’s the same power : PSU S
    the two iMac don’t start nothing nothing :
    do you think it’s only the capacitors ?
    capacitor issue on the iMac start but stop after few second or not ?
    Thank for feedback before sell them.

    eric

    November 14, 2011 at 6:40 AM
  • Jim Warholic says:

    Eric,

    I would take a close look at the capacitors on the power supply. If any of the capacitors are bulging, then it is probably an indication that the power supply is at least causing part of your problem. Note that the iSight models sometimes have other issues to contend with also.

    Jim

    November 14, 2011 at 7:06 AM
  • David Piper says:

    Hi Jim,

    I have a 20 inch G5 Isight Imac 3rd Generation which will not start up. When the power cable is plugged in, the 1st LED lights up but when I press the power on button it goes out and 2nd LED does not light up either. I have had a look at the PSU and the caps are not bulging or leaking. Do you have any idea what it could be? You don’t have a picture of my type of PSU

    Thanks in advance

    Dave

    December 1, 2011 at 8:10 AM
  • Jim Warholic says:

    Hi Dave,

    If you care to send me a picture, I’ll take a look. Since I updated my website with the new theme, I had forgotten to have my direct email link on the right sidebar area. So, I have added near the top side area.

    As far as your problem is concerned, is the PSU connector the same as the other ones? If it is, you should be able to measure the voltages using the Apple iMac pinout information link found here.

    It might be that one of the voltages are missing or low on the PSU.

    Regards,

    Jim

    December 1, 2011 at 10:13 AM
  • Jim Jackson says:

    Jim,

    I received the cap kit, thanks!, for the power supply problem, installed the caps and powered up the iMac. It came up fine and then shut off after a couple minutes. I started it back up and reset the PRAM. It started up fine and ran for about 15 minutes and shut off. I started up again, reset the PRAM and it ran overnight and was still running when I left for work. Would it fix it for good if I reset the SMU? There was an ambient light sensor on the PS, does that mean it will reset the SMU automatically?

    So close to success,

    Jim Jackson

    February 13, 2012 at 5:58 AM
  • Jim Warholic says:

    Hello Jim,

    There are a couple of things I would look at.

    One item is to make sure the computer is not overheating. I would try blowing a fan on the backside with the cover removed. If you can get it to stay on, I would install the free temperature monitor program to see what is going on with the temperature. Of course, make sure all your fans are working in the iMac itself. Sometimes there is a lower squirrel cage fan hidden at the very bottom on some of the iMac models. I have seen this fan not functioning and the iMac will overheat. Also make sure all the cooling fins are blown out. Sometimes these get clogged up and reduce the air flow.

    As far as resetting the SMU and PRAM, I don’t believe the SMU is reset automatically with the ambient light sensor model. I would follow the Apple instructions for how to reset the SMU.

    Jim

    February 13, 2012 at 8:11 AM
  • Jim Jackson says:

    Hey Jim,

    Thanks for the help. I’ll check for temp issues tonight. I did blow out vents, fans and such before re-assembling.

    I asked about the SMU because I had a fuzzy memory of reading a note somewhere. I re-found the note here: http://support.apple.com/kb/HT2173 the Note under step 9. If this is true, my SMU is reset upon unplug and replug of the power cord and a manual reset wouldn’t be necessary.

    Jim Jackson

    February 13, 2012 at 9:31 AM
  • Gerry Beaudoin says:

    Great site! I recently had my power supply replaced by a Mac service company. (G5 iMac from about 2004 – no iSight). Everything seems to function well – except that infrequently, I hear a “pop” sound accompanied by a complete black-out and crash; it always re-starts, but sometimes needs a couple of minutes. This is similar to problems occurring before power supply replacement except it is very infrequent and recovery is very quick after the crash.
    Your thoughts?

    February 29, 2012 at 3:42 PM
  • Jim Warholic says:

    What could be happening, is that the power supply is kicking off due to excessive heat, which would cause an abrupt shut down. I would load the free temperature monitor programs available for the iMacs. There are a couple that I know that work good. Simply do a Google Search for iMac temperature monitor and you will get right to it.

    Also, the capacitors on the main logic board could be causing the PSU to go into a failure mode. I have seen this happen on more than one occasion, even if the capacitors are not bulging. Note, capacitors do dry out and stop filtering the voltages, especially when heated up.

    February 29, 2012 at 4:14 PM
  • john Fischer says:

    A quick question…

    I bought a 17″ non iSight, non ALS G5 iMac, and it seems quite dead.

    I took the back off, plugged it in and noticed that the first diagnostic LED is on but flickering. If I unplug it, the flickering stops, and after a moment, the LED turns off.

    My guess is that there’s at least one bad cap here, and some AC is getting through.

    Thoughts???

    May 18, 2012 at 5:11 PM
  • Jim Warholic says:

    Yes, it most likely has bad capacitors inside the PSU.

    May 18, 2012 at 8:57 PM
  • Accessme says:

    I have a problem with Power Supply of iMAC G5 17″. “Delta ” 614-0327.

    The Power supply worked and after 3 minutes it shutdown.

    I looked inside and the Capacitors seem OK… No Bubbles or blown Caps.

    Have you seen this kind of problem?.. Do you have any suggestions for solutions?

    I tried to cool down the big Transistor/Drivers – no help.

    Any help will be appreciated.

    June 24, 2012 at 9:48 PM
  • Jim Warholic says:

    It’s possible that the capacitors on the main logic board are causing your problem with the PSU. I have been seeing capacitors that look okay, are actually dried out with the electrolytic juices, and thus do not filter the voltages properly. If the MOB caps are bad, then the computer tends to quickly overheat due to excessive ripple current. I suggest you take a read on my other Apple articles for more information.

    June 25, 2012 at 12:07 AM
  • Miguel says:

    My power supply has the model number 614-0398 (iMac G5 1.8GHz G5; PowerPC 970fx). It is hard to find this one. Are other ones compatible, such as 661-3625 or 661-3289? If I were to attempt to open this up to change out capacitors, which size/type torx wrenches do I need? Also, having difficulty finding upgrade to get 2 GB RAM. Everyone seems to use different descriptors. Thank you for your help.

    August 19, 2012 at 8:45 PM
  • Jim Warholic says:

    Note that there are other part number power supply units that I do not have pictures for. Though they are different part numbers, many of the kits above will work for other PSUs depending on the capacitors used in the other power supply. Just cross reference your capacitors in your PSU with the lists above.

    To open most of the PSUs requires a security Torx size T10 bit. Note that some of the PSUs have security Phillips screws instead.

    As far as the memory, DDR PC3200, DDR (non-ECC). Note that two 1GB sticks for a maximum of 2GB of the PC3200 DDR (non-ECC) will work in the older iMac G5s.

    August 20, 2012 at 8:00 AM
  • Wayne says:

    Hello Jim, my iMac G5 also got problem with power cutoff itself after running a few minutes. I opened and check the power supply and mother board, but I did not find any damaged caps in psu and motherboard. Is this symptom also due to bad capacitors issue? If so, do I need to replace both caps in the psu and mother board? The model name is IMac G5 17′ /1.9/512MB/160GB/SD/AP/BT.

    September 29, 2012 at 3:18 AM
  • Jim Warholic says:

    Hello Wayne,

    First off, I would make sure all the fans are running, and all the cooling fins are cleaned out. I would blow it out with clean compressed air. Then, if you can get it to stay on long enough (maybe having a fan blowing on the motherboard with the back cover off), load in one of the free iMac temperature monitor programs to see if maybe the temperature getting too hot is what is shutting it off. Note that the fourth LED is for over temperature. Refer to the archived Apple document, About the iMac G5 Diagnostic LEDs.

    Additionally, I would check out the PSU voltages. Refer to my other Apple articles for more details.

    September 29, 2012 at 8:31 AM
  • Wayne says:

    Hi Jim
    Thanks for your prompt advice. I checked all fans ok and also check the led1-4, I can see the led light up from led1 to led3, then power cut off. In such case, do you think I should order repair kits? If so, pl let me know which kit I should order ? PSU or mother board? Thanks

    September 29, 2012 at 8:25 PM
  • Jim Warholic says:

    Hi Wayne,

    It’s possible it might be something else other than the capacitors. I would see if you can measure the PSU voltages. As far as which kit to order for the MOB, I would count the caps visually and then if you also wanted to order for the PSU, I suggest visually comparing the inside of your PSU to my pictures.

    Feel free to send me pictures if you are not sure.

    Jim

    September 29, 2012 at 9:51 PM
  • Johny says:

    I recognize those bulged capacitors on these psu pictiures and they are very bad quality caps. Apple is to blame for choosing them…

    April 19, 2013 at 4:20 PM
  • Alexis Jasmin says:

    Hi Jim
    I replaced all bad capacitors on my IMac G5 (ambiant Light Sensor) 17inch motherboard with the kit I received. I restarted the computer and LEDs light #1 and #2 are solid but nothing on #3 (and nothing on the screen). I don’t even hear the chime at startup but the fan are running fine. I’m about to order the CPU capacitors replacement kit but was wondering since the LEDs light #2 is on does it mean it’s not a CPU problem?

    April 22, 2013 at 9:10 AM
  • Jim Warholic says:

    A couple of things I would look at.

    First off, you mentioned you “replaced all bad capacitors.” Does that mean you only replaced the bulging ones or did you replace all capacitors of the 1800uF and 1000uF capacitors? The reason I ask that, is some folks are only replacing what they visually see as bad capacitors and not replacing the whole banks of capacitors. While visually bulging capacitors are definitely bad, it is highly likely the other capacitors are also bad even if they are not bulging.

    Second thing I would do is verify all your connections are solid. The third LED represents the video. If the little video inverter card is not fully engaged or if you have issues with the video, it can give you an error of this type.

    Third thing I would do is verify all your voltages. Just because LED #1 and LED #2 is on does not mean that the whole PSU is good. Refer to my other articles for measuring PSU voltages.

    Hope that helps you.

    April 22, 2013 at 9:33 AM
  • jabu74 says:

    Hi

    Please send me DPS-180SB A REV: 01 power supply schematic

    July 23, 2014 at 5:08 AM
  • Jim Warholic says:

    Note that I have not seen any schematics of any of the power supplies, nor have I heard of anyone in possession of them. I do not believe that Apple ever released schematics, engineering drawings or prints for any of the power supplies or circuit boards. I suspect that Apple only provided the board layouts for the circuit board manufacturers to build, and the component locations. Obviously this is not the same as the electronic schematic drawings.

    July 23, 2014 at 8:36 AM
  • Vince says:

    Have an iMac g5 17″ with “B” style power supply. Machine will boot with logic board switch but not external switch. LED 1 flickers rapidly when off and lights steady when running. Power supply has 3 slightly bulged caps, logic board caps look good. Do you think caps are all it needs? Why won’t it boot with the external switch if it will with the logic board switch?

    Thanks
    Vince

    December 8, 2014 at 12:47 AM

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