17.12.2013

Imac power supply test

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Los compradores pueden tener que hacerse cargo de tarifas adicionales correspondientes a aranceles aduaneros. Este importe incluye los aranceles, los impuestos, la corredurA­a y otras tarifas aplicables. Las tarifas de envA­o internacional e importaciA?n son pagadas en parte a Pitney Bowes Inc. Please contact us before returning any goods to receive free technical support and register for an RMA code. Any accepted returns must be returned in original packaging within two weeks of the RMA being agreed. High quality, low ESR, capacitors for sale, or match iMac PSU model type you have to the detailed pictures. Are you having problems with your Apple iMac G5 17 and 20 inch consumer, university, or student models? Well folks, here is one of the problems with many of the Apple power supplies manufactured for their iMac G5, 17 and 20 inch series computers. If your Apple iMac G5 power supply doesn’t match up exactly to what you see pictured below, feel free to send me your pictures (inside and outside of the iMac MOBs and PSUs).
As a side note, if you need to get the data quickly (pictures, files, and programs) off the HD for your old Mac, and place it on your HD on the new Mac, read about the ›Apple iMac G5 Hard Drive Data Recovery. The capacitor sizes, included in the MOB kits, are the actual original sizes of the capacitors on the motherboard; making your job much easier to replace them. If you are interested in more than 10 MOB cap kits, please send me an email with a total amount of how many iMac G5 cap kits you are looking for, along with a note of which of the two different cap kit sets you are interested in. Apple provides a diagnostic guide for determining whether the problem is with the motherboard or the power supply. Since, I feel that I have been somewhat of an online trailblazer on documenting the iMac issues and the Apple iMac G5 motherboard repairs project, I thought I would take the time to dive into another area that many of our readers have stated is also a big problem with the Apple G5 line of computers. There are several service repair or replacement options available for your iMac G5 power supply. Before I talk about option number three, I would like to point out that when you buy a used or new power supply from Apple or another vendor, you have no idea whether the capacitors that are used in this new or used PS are any better than the ones that were installed in your particular iMac.
So, I get my new, broken, what an oxymoron, iMac G5 back to the office and I plug it in, push the power button, and it just sits there staring at me with a blank screen.
The next step in my troubleshooting analysis probe was to remove the power supply and do the smell test. The iMac G5 PSU case design, is one by which Apple’s engineers designed their power supply units with security torx fasteners (screws) attaching the metal cover housing to prevent unauthorized disassembly, and also I am sure to prevent anyone from getting hurt. In this case no problem on the mother board, but big trouble in the power supply (lots of caps in trouble, one totally blown).
I was able to unscrew the torx screws using a precision miniature screwdriver, and broke out the small internal security tabs within the head of the torx screws themselves. Capacitors’ Locations, Sizes, and Electrical Values For Apple iMac G5 Power Supply Unit Diagram Schematic.
Here’s a confirmed list of the secondary (low voltage) side PSU capacitors installed in the iMac G5 17 inch model.
What you are looking at in figure #3, once you remove the cover of the PSU, are signs of bad capacitors all over the printed circuit board. Directly below in Figure #4 is a slightly angled picture view, with a closeup of the capacitors on the iMac G5 Power Supply printed circuit board in view and most of the silicon rubber goop removed. The tools I used on the PCB for cutting and picking away at the silicon adhesive are on display in Figure #4 too. So, the bottom line is most of the secondary low voltage side capacitors must be replaced on this particular G5 PSU. A word of caution about the bottom surface of the PCB before you proceed with on-board capacitor replacements.
Now, the next step in the process is to purchase the nine electrolytic, radial leads, low ESR capacitors designed for tight spaces. I hope this iMac repair training course series of articles helps everyone that is facing a decision of possibly having to go to the precious and non-ferrous metal reclamation and computer electronics recycle center with their crippled or broken down Apple iMac now and in the future.
Additionally, if anyone finds a source available for engineering prints, technical drawings, or electronic schematics for Apple iMacs, please send me an email notice or send attachments to James.
With that iMac G5 mod in mind, maybe someone can come up with an external power supply box, and just plug it in to the iMac P1 plug on the motherboard. This was recently posted as a comment by another person for the pin outs and voltage information: Note, I have confirmed this pin out information.
FYI: More information for measuring the voltages can be found at my how to measure iMac G5 power supplies article. For those looking for help to expand their business online, contact Professional Web Services today for a professional SEO and Internet marketing services company that will get your business found online at Google Search now. Get your business website found online with Internet marketing services from Professional Web Services. Click Here to Buy Capacitors, or click here to match up your iMac PSU variation to the detailed pictures. If your iMac power supply doesn’t look exactly as above, or would like to have a free consultation, and provide a visual evaluation for me to take a look at please send in your Apple iMac G5 pictures, to compare. Get your B2B or B2C business website found online with Internet marketing services from Professional Web Services. I suspect there is a poor connection internally with either a cold solder joint on one of the components, or something of an internal connection issue with one of the components. You might want to also visually look for a cold solder joint on the bottom of the PSU circuit board. I have an iMac with Intel Core2 processor, 24″ and it has a strange issue and I think its in the supply but needed your advice before doing any step. Hello Jim I was really happy today and reading your Caps story I had a 20 inch G5 and the PU went bad and also the middle screw broke on the back that clamps the bottom and it touches the unit but today I got a 40 20 inch G5 and it looked the same and was junk so I wanted to take out the PU it was different it had a light censor attached so I took it off .the centre screw metal parts I also exchanged because I think it acts as a earth when back is put on ,I can send some photos well it worked but there is something wrong with sleep so now I am installing leopard . Remember to use some kind of flux cleaner to remove all the extra flux you are going to have after you get all that solder off there. I have 2 imac G5 would not going on furter from white light in front.soi open the back cover and checked the LED.
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Purchase high quality, low ESR, mother board grade, long life, high temperature rated capacitors for your iMac G5 PowerPC mother boards.
It is designed for those that want to recover the information from their hard drives on a dead PC or Mac.
If your country isn’t listed for a shipping destination, please let me know to add your country to the list. Note: Apple early model and late model iMac G5s with the PowerPC processor have different quantities of caps required on the MOB. About the time Apple was building their G5 line of personal computers, several Taiwanese electrolyte manufacturers began using a stolen electrolyte formula that was incomplete, and lacked key ingredients needed to produce a stable capacitor.
That big issue has to do with the main power supply installed in the iMacs are dying and dropping like flies.


I already own an Apple iMac 20 inch model but I needed a 17 inch one for further investigative work. Yes, use your other senses other than eyesight when troubleshooting electronics or checking out other industrial equipment.
I do not own one of these security torx drivers, as I suspect most people can say they don’t have one in their tool box either.
One can see some of them through the power supply case, so you might want to take a look at yours. The first image (Figure #1) above shows the blown capacitor, burnt on the top, and burnt residue on the cover too. Be careful not to damage any of the SMC, Surface Mount Components (Figure #5 pictured on the right) located on the bottom of the printed circuit board.
For most folks out there in Internet land, I realize there probably is much technical information to digest here in one quick reading. Please note that I cannot be held responsible for any damage that you might do to your computer or yourself. After all, I believe that these Apple G5 iMacs are not an EWaste product, and are most precious and beautiful machines for their owners to use. But also note that the cable wiring comes over the top of some of those capacitors on the right front section of the PSU.
The option is to possibly convert a standard PC ATX power supply and use it for the Apple iMac. Another person also emailed me in October of 2008 and mentioned he had this ATX power supply working for an Apple iMac g5 too. Using a modified ATX Power supply (Need 12+ on pins 12 and 18), and the good 20 volts on the dead Apple Power Supply and a ground, I was able to boot my 20″ iMac using the combination of both power supplies.
It doesn’t always give the correct reading with a ohm meter whether using digital or analog  meters because of other components affecting the readings of what you might be trying to check in the circuit. Do not use unknown surplus caps, or even new or surplus caps that have been sitting on the shelf for ages. The hard drive is bad and can’t be detected, so I replaced it with another hard drive which I first tested it on PC and works fine. Take a look at the Apple maintenance manuals for your particular model to verify where things are located.
There are many different issues with these 17 and 20 G 5 because the PU is on the bottom and strangely it does not get cooled and seems compact using the Mac along period it gets hot and that is the issue keeping the thing plugged in no Fans are not enough and sound like jet engines. Even if the capacitors are not bulging, they could be dried out and making the PSU work harder than it should.
I opened it and I have a green light on the main board but when I press the power button nothing happens.
Heat the solder in the MIDDLE of the bridged area, and suck as much as you can with each pull. And remember to melt just a TINY bit of solder onto the iron tip before you touch it to the area you are trying to melt, it will help with the thermal conductivity. My dad is an electrical engineer… not too computer savvy but excellent with solder and soldering and we have replace many capacitors in strobe powerpacks etc. I suspected the power supply (APl 4ST03)so I started down the slippery slope of opening it up. 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. In that time, over 300,000 orders have left our facility for US and international destinations to help save old devices from the landfill and bring them back to working condition. Climate controlled, secure building with 24-hour night vision surveillance.Monthly specials and promotions in our Repair BLOG! Si resides en un Estado Miembro de la UE aparte de Reino Unido, el IVA de importaciA?n de esta compra no es recuperable. En el anuncio del vendedor encontrarA?s todos los detalles y una descripciA?n de los desperfectos, si los hay. The missing ingredients caused the electrolyte in the capacitors to break down, evaporate, leak out of the cap casings, caused overheating of the capacitors themselves under normal load conditions, and subsequently caused exploding poppers.
You can read the actual repair extension program text in the Apple iMac Mother Board article, exactly as it was in the original Apple documents. Included in that Apple document are instructions of how to turn on an iMac with the back cover off. From what I understand (though not confirmed) about the iMac PSUs, is there are at least several different power supplies used by Apple in their iMac G5 model lines.
I have heard stories of Apple Service replacing a person’s iMac power supply, and several months later having to do it again. So, I went searching for a broken iMac G5 computer that I could get my hands on for a fair price. The smell of burnt electronic components can sometimes be detected months and years later, even after a burnt component has been replaced.
Electronics, and power supplies in general have high power electronic circuits which can cause a body harm if you touch the wrong thing, even if unplugged. I was having an email conversation over the past week with a physics professor at a university. Please send me an email confirmation or comment on the iSight models, iMac G5 20 inch models, and ALS (Automatic Light Sensor) models, along with any capacitor sizes, quantities, and values would be much appreciated. If you look closely at Figure #3 and Figure #4, you can see telltale signs of capacitors that are bulging and getting ready to blow their tops. These discrete SMT, Surface Mount Technology micro components are very small (some of the SMD, Surface Mount Devices, are hard to see with the naked eye) and consist of SMC diodes, SMC resistors, SMC capacitors, SMC transistors, and SMC IC chips in close proximity to where the large electrolytic capacitor leads protrude through the bottom and are soldered to the plated through holes of the PCB. This website is for educational purposes only and you are responsible for everything you do with the given information. I think there is a lot of life left in these very powerful iMac G5 computer machines for today and tomorrow. Click the how-to link for more details about how to measure the iMac G5 power supply voltages and turn on the PSU when the PSU is removed from the iMac computer. Please take a look and compare these Apple iMac power supplies to your power supply before purchasing.
You may have to to try warming up selective areas, or even cooling down selective areas once you have it working to try and determine the localized area of the problem. But when I hooked it up to the iMac and turned it on I saw it cant be recognized either just like the older one, so I took it out and tested it on my PC I saw it has the same error message as the older one showed it on my PC, which cyclice redundancy error. Watch this video of two exploding capacitors (one about the 28 second mark and then another toward the end of the video). I have heard that these machines tend to really overheat and cause problems with the BGA – Ball Grid Array to separate on the solder connections, and then there will be poor connections between the board and the main chip. If any of those are bulging, then the PSU is in question regardless if the first LED comes on. Solder wick is not very useful in this situation, there just isn’t enough time for it to work, and you have WAY too much solder for it. The solder mask is used to only allow solder to attach itself to the bottom of the board where the metal is exposed when going through a wave solder machine.
If you do bridge two different electrical points with solder and then plug the PSU in, the soldered bridge will cause a short circuit, and most likely damage the PSU. I am hopeful that you may be able to give me some insight as to the cause and what I may be able to do about it. You could try opening it up and see if you spot anything with a visual inspection of the logic card or power supply unit. Although the power supply doesn’t have any bulging caps, it does have burn marks on the pcb side just under the rectifier bridge and there is a scorch mark on the back of the screen panel. Used parts designated with a Grade B condition may have slight damage such as small dents or deep scratches that are noticeable but should not affect the functionality of the device. I would also suggest reading the latest article on Fat Caps and Ripple Current to have a better understanding of what is happening with Bad Caps inside these Apple iMac G5 power supplies and logic cards.
Consequently the capacitors started bulging, overheating, and exploding in many of the power supplies and mother boards manufactured by Apple, Dell, Hewlett-Packard, and others which has been documented by numerous articles online.
I didn’t want to spend a ton of money on a broken Apple to do my research, but I needed to do some more engineering and technical failure analysis of the problems of iMacs not turning on because of mother board problems or a power supply situation.
I placed the power supply up to my nose, and I thought I got a slight whiff of that unforgettable smell of burnt electronic components. Note the gray silicon rubber adhesive that has been squeezed into and between the electronic components on the circuit board.


I will most likely publish an updated technical article or add to this document when I locate new capacitors and proceed with the the installation of these new low ESR electrolytic capacitors. At least I have a documented road map and general circuit diagram schematic of the main power supply components, along with engineering failure analysis that I will be using myself for technical reference for now and in the future. Even though I have no experience soldering anything I followed your instructions carefully. Additionally, you might want to verify the two HDs work externally with the universal hard drive USB adapter.
Additionally I have heard and seen videos on YouTube showing the issues of the video related to the heat generated.
The pads on the bottom of the PSU where the legs of the caps are soldered is surrounded by this solder mask that makes it look like there are different points, when in fact they are the same electrical points. I would suggest you look carefully before getting started and verify the points that will be soldered and unsoldered. Has anyone had any luck repairing the SMPS or when they blow do they damage most components?
Did all the usual checks before removing the front bezel to get inside (what a task that was).
You may also go to any Apple Retail Store with a Genus Bar and have the Apple folks take a look at your iMac for you.
One button is the internal power button, and the other button is for resetting the System Management Unit (SMU) which is located right next to the internal power button. By-the-way, the cost of a power supply for an iMac will likely set you back 150 to 200 buckaroos.
Many people kept telling me that they had an iMac G5 17 inch model computer with no physical signs of bad capacitors on the motherboard. Note also that power supplies typically have a primary high voltage input side and a secondary low voltage(s) output side. He was also the first to mention to me, about the security torx key being required to open the PS cases. Some believe that this goop was used for anti-vibration and noise dampening as can be seen with the application of a small amount of goop on a potentiometer adjustment located in the top middle of the PCB, next to the transformers. If you heat up a SMD by accident with the soldering iron, (see lead-free soldering tips for more soldering information) you will potentially dislodge it from its PCB pad. By-the-way, I now have a large quantity of high quality, low ESR, electrolytic capacitors available for sale for the DIY Apple iMac G5 motherboard repairs. And one more point that I would like to make, it sure would be nice to have a circuit board schematic for the power supplies in my hands. Get something bigger (but not too big), and heat the solder only until it is molten, no longer. For those of you that are interested, I have documented a do-it-yourself repair procedure and an educational information manual on the Apple iMac G5 motherboards along with students’ user comments.
Find the nearest Apple Retail Store – Genius Bar in your area, and even make an Genius Bar appointment online too. The high voltage input side can have large filtering capacitors which can store an electrical charge (DC voltage potential) for a long time, even after a power supply is unplugged from the AC power outlet.
Also, note the one 350 microfarad 35 volt 10mm x 20mm capacitor (Figure #4 with close up view) that is located under the copper heat sink in the middle of the PCB.
Figure #3 shows the PCB top side surface before picture, with all the silicon rubber adhesive stuck between the electronic components.
Note also, there is a 24 Volts output on the Apple iMac Pinout diagram that is missing on the ATX Power Supply Pinout diagram.
When the CD player started up I heard a pop and the screen went black and now won’t power up. Go to my Apple capacitors for sale website and click on the other thumbnail images showing the plus and minus signs. I suspected the PRAM battery and on this model the battery is on the back side of the mother board. Apple provides technical support for your Mac, iPod, Apple TV, and iPhone at the Genius Bar too. I found an iMac G5 17 inch on Craigslist from a guy that felt he got ripped off by someone selling a supposedly good working iMac to him a short time back and then when he plugged it in, it didn’t work. Take the precautionary step, and discharge these primary capacitors (after it is unplugged from the AC power) with a screwdriver or place jumper wires across the leads prior to working on the PSU printed circuit board.
However, in my opinion, I believe this was an attempt by the manufacturer (Apple) to make it more difficult to repair the PSUs when using it so liberally throughout the entire PSU. This is going to be most certainly problematic for capacitor replacement, since it is most likely that I will have to remove the 1000 microfarad cap in front of this 350uf capacitor in order to slide it out from underneath the heat sink assembly.
Figure #4 picture is after the silicon rubber, for the most part, has been removed from the components on the secondary side of the PSU. Some go to infinite and stay, other go to infinite and fall back to zero when using an ohm meter?
So full surgery was necessary simply to replace a PRAM battery that did not appear to really be bad. However, after noticing the glowing round front light going on and off, I did the command Option Command Eject to wake up the machine, Miraculously, I got a screen with desktop etc.
I opened the back of the computer once again and took a much closer inspection of the motherboard and the capacitors.
If you have a different type of supply than what is shown here, with large cylinder capacitors standing up on the primary side, you will not be able to get to the leads on the bottom of the circuit board in order to discharge them.
If however, I am wrong, and this is not the case, and the designer intended this goop to be used for anti-vibration noise dampening purposes, the assemblers seem to have gone overboard on their use of it, and it has had an unintended consequence of heat build up. The heat sink assembly is mounted to what appears to be voltage regulators that are impossible to remove without first removing other inductor choke coils, capacitors, and other components in front of the heat sink assembly.
I spent a couple of hours with it, ran the Apple Disk utilities and repaired permissions etc.
See the Apple Power Supply, 17-inch Replacement Instructions for how to remove and install your power supply unit.
So, after talking with the seller and asking him some questions about this particular iMac, we settled on a fair price, I met him in San Ramon, CA, and purchased it from him.
Believe it or not, all the capacitors look good on the MOB, just like some of my readers have documented with their own stories in written emails I received from them. However, if a power supply is left off, unplugged for a period of time; certainly if it has been off and unplugged for an hour or two, the majority of the charge will have dissipated from the capacitors due to in circuit resistance and time. If you look closely at the tall boy cap, I think this one ended up sandwiched in an oven, right next to the coil choke (see closeup picture on Figure #4).
See quotes: “+24V is used to power the LCD inverter” and “24VDC line looks to be for the display (backlighting)”. The main power board and dc to dc board are separate on this iSight and I can’t find a pinout for this machine anywhere. If you have an Apple model with the ambient light sensor, pay particular attention to not breaking the wiring or the sensor that is mounted to the lower portion of the power supply when removing the PSU.
This is a completely different issue than what I saw on my iMac G5 20 inch motherboard problem with the bad capacitors on the MOB, with some caps just about ready to pop. In my opinion, it’s not like the small capacitors are going to move once they are soldered in place. All the capacitors on this motherboard looked completely intact, with no signs of swelling, bulging, or electrolytic juice leaking out anywhere to be seen on this 17 inch model. It’s also likely that this silicon rubber filler was instrumental in the early failure of the other capacitors too.
Oh well, keyboards and mice are not very expensive, and if I need Mac OS X software, I can purchase that too.
Excessive heat buildup likely resulted from the insulating characteristics of silicon rubber encapsulation which would result in a runaway thermal chain reaction and cooked the components. When not connected to the motherboard these voltages remained stable, but as soon as I plugged into the motherboard (I know its risky doing it this way) the voltage from the main PSU fell to 0v and stayed there even when the motherboard was disconnected.
This silicon adhesive must be gingerly picked at and cut away, in order to get proper access to all the bad capacitors, and be able to remove them when they are unsoldered from the PCB.



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