IMAC 24 PSU Bad Caps replacement

[TBI]

I am trying to repair the wife's IMAC 24 PSU.
I found five bad caps
680UF 16v LXY 10mm x 12mm
1000UF 16v LXY 10mm x 17mm
1500UF 16v LXY 12.5mm x 17mm

Would it be OK to replace with these available from Bad Caps or would there be better choices?

680uF 16v MCZ 10mm 13mm
1000uF 16v MCZ 10mm 16mm
1500uF 16v HZ 10mm 20mm

[999999999]

Re: IMAC 24 PSU Bad Caps replacement

Yes those should work.

[Toasty]

Re: IMAC 24 PSU Bad Caps replacement

This is a newer unit? 24"?

Could you post some pictures of the problems and model number of the unit?

Toast

[TBI]

Re: IMAC 24 PSU Bad Caps replacement

2.16 GHz Core 2 Duo processor iMac Intel 24" EMC 2111.

[Toasty]

Re: IMAC 24 PSU Bad Caps replacement

So, the problems continue with the newer units. Interesting.

[TBI]

Re: IMAC 24 PSU Bad Caps replacement

yup, and even worse I was surprised to see KZJ caps on the mother board.

[TBI]

Re: IMAC 24 PSU Bad Caps replacement

pics of the PSU caps, sorry for the focus.

[Toasty]

Re: IMAC 24 PSU Bad Caps replacement

KZJ doesn't surprise me. They were still being produced then. They're not a "plague" capacitor, just one that doesn't hold up well under heat. That observation was made by PCBONEZ several years ago, along with series KZG. The reason given was that they both use(d) the same electrolyte formula. Both series are deprecated now, so anything seen today would be older than 3 years, I would guess.

An Acbel PSU, I see. Looks less complicated than the old iMac G5 ones.

If you don't mind, would you please relate the AcBel API number (from the board) and the Apple part number (label)? I'm sure to start seeing these in the near future...

BTW: The 1500/16 HZ cap is a bit of overkill...

I LIKE IT!!!

Toast

[TBI]

Re: IMAC 24 PSU Bad Caps replacement

From the board;
API5ST06-291G
RO3X45-00041

From the tag;
FZ72401Z3X6MA

I also have a G5 Imac that seems to need caps but I just keep putting it off because we have more than enough PCs around the house right now. I think I will repair both these Imacs and sell them before I have to work on them anymore.

[Toasty]

Re: IMAC 24 PSU Bad Caps replacement

Thank you!

Hmmm... I thought the Apple number would be something like 661-####...?

>>because we have more than enough PCs around the house right now.<<

Never! Sacrilege!

LOL!!

[TBI]

Re: IMAC 24 PSU Bad Caps replacement

Good news, I found the apple part number.

614-0402 which updates to 661-4183.

Bad news, replacing the blown caps did not fix my unit. I will troubleshoot further.

[TBI]

Re: IMAC 24 PSU Bad Caps replacement

Found this pic that looks just like mine.

[Toasty]

Re: IMAC 24 PSU Bad Caps replacement

You replaced all except the 2 large brown ones, correct?

[TBI]

Re: IMAC 24 PSU Bad Caps replacement

You replaced all except the 2 large brown ones, correct?

I only replaced all 5 green ones as seen in my before pic from 1/9/2012. Those were the only ones that looked bad, should I replace the others except the two large brown ones?

[Toasty]

Re: IMAC 24 PSU Bad Caps replacement

Looks are deceiving, unfortunately. Except for the big brown ones, you have 3 to go, yes?

[TBI]

Re: IMAC 24 PSU Bad Caps replacement

OK thank you for your help.

Now I just need some stronger glasses so I can see what I am doing.

[bhumphre]

Re: IMAC 24 PSU Bad Caps replacement

HI, I have the exact same issue and the same power supply board as shown in the Pics on this thread. I have a couple of follow up questions on this issue; 1) Did replacing the 8 capacitors fix the problem? 2) Where did you buy the replacement capacitors, and exactly what were the specifications on the 8 cpacitors so I can order them? Thanks in advance for any help on this.

[TBI]

Re: IMAC 24 PSU Bad Caps replacement

1. I gave up when the 5 did not fix it so I'm not sure how close I was to success. I was having a lot of trouble seeing what I was doing and needed a quick fix so I sold my old bad PS on EBAY for more than $40. and purchased a new one.
2. I don't know what the other caps were because I did not remove them. The first 5 are listed.

I had success with doing caps replacement on motherboards so I know it works. badcaps.com gives great service and I would highly recommend buying from them and besides it helps support these boards.

Do you have caps showing the bulge? Maybe desolder those and replace those first.

[bottleneck]

Re: IMAC 24 PSU Bad Caps replacement

Hello,

I too am experiencing the same issue with my imac. When i plug in the power cord i hear a high pitch squeal coming from the power supply. The diagnose led lights only light on led #1. When i press the power button led #2 and #3 flash then everything shuts down, then no lights are present. I suspect that the power supply is the culprit. I have included pictures of the power supply. You can see the previously mentioned caps have bulges on top. You can also see on a couple of them some liquid type release on top (left 1500's) . The others have what remains of the foam pad that was present (right 1000's) i would like to know which ones i can order here, to replace them. I have done some soldering before and work on computers for a living however i have never replaced any capacitors before.

I was hoping for some help with this in hopes to get it working again. Any instruction, advice would be appreciated.

Thank you!

[sam_sam_sam]

Re: IMAC 24 PSU Bad Caps replacement

One
uf on the cap..> 1500 uf
Two
voltage of the cap I can not see the voltage that marked on the cap from the photo
Three
size of the cap they look like they maybe...> 10 to 12 mm D X 20 to 25 mm H caps <... from the photo
Four
the series of the cap that you are going to use I would use one of the following...> FR, FC, FM, KY, KME

You can get these cap at Mouser or Digi Key

I hope this helps