Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

The_Croupier

macrumors 6502
Original poster
Oct 11, 2018
420
284
Does anyone know where i can get this capacitor or a same spec alternative?

046
SEPC
100
16

IMG_20210220_180651.jpg


Thanks.
 
If you look at the data sheet it's just a lot code, so not relevant to functionality. The bottom numbers are the ones that matter. Voltage should be same or higher, and capacitance same.
Screenshot 2021-02-20 at 12.36.07.png
 
Last edited:
So i ended up soldering one of these in, its a little tall but luckily just clears the HDD fan. And the iMac is back in business. All be it i have discovered that the ODD fan is now dead.
IMG_20210312_233910.jpg


Next up I'll try my luck on the PSU fuse 🙄

IMG_20210313_002240.jpg
 
Last edited:
So i ended up soldering one of these in, its a little tall but luckily just clears the HDD fan. And the iMac is back in business. All be it i have discovered that the ODD fan is now dead.
View attachment 1742687

Next up I'll try my luck on the PSU fuse 🙄

View attachment 1742717
The fuse is definitely blown, there are burn marks on the label "F00...". So you have to check all your Mosfets (and best, diodes too) if you don't want to burn your new fuse immediately (and repeatedly).
 
  • Like
Reactions: The_Croupier
The fuse is definitely blown, there are burn marks on the label "F00...". So you have to check all your Mosfets (and best, diodes too) if you don't want to burn your new fuse immediately (and repeatedly).
Roger that, minimum amount of fuses I could buy was 10 so I'll start with that and cross my fingers 🤞
 
Finally my fuses arrived from China 😀
And I am happy to report we got LEDs baby 🤪

I'm very lucky when I shorted the PSU that the fuse was the only issue.
I know I suck at soldering.

IMG_20210410_073649.jpg
IMG_20210410_074128.jpg
IMG_20210410_074146.jpg
IMG_20210410_074337.jpg

IMG20210410080825.jpg
 
Last edited:
  • Like
Reactions: Nguyen Duc Hieu
Got another one,
Has anyone seen plastic insulation degrade like this:
IMG20210418075223.jpg
IMG_20210418_083324.jpg


I didn't even notice it as I wasn't replacing the fan and the cable was tucked in nicely as it should on this 2011 21.5"

When I powered on with the screen off to check the diagnostic LEDs I saw a flash and new something had instantly fried.

Turns out it blew a ferrite bead at L5710 and looks to have taken out its pad.
IMG_20210418_095213.jpg

This was the area I saw the flash, however after examining the board further I noticed this:
IMG_20210418_095416.jpg

C1603 and C1620 are gone, thinking it must have been related to the fan shorting?

I carefully seperated the wires on the fan with scotch tape and hesitantly tested the fan in a 2010 and at least the fan is still working, although the corroded wire sheath is all the way down to the board solder joint and is brittle.
I'm thinking my best option for the fan is to cut the wires in the middle and heat shrink over both ends right up to the connection points except the twisted pair as it is fine, then solder the wires back together.

Hopefully I can find the 2 resistors and ferrite bead on AliExpress and get this going again.

CRITICAL-L5710-220-OHM-1.4A
C1603-22UF-20%-6.3V-CERM-X5R-805-3
C1620-10UF-20%-10V-X5R-603

Comments appreciated.

EDIT:
I think i got the correct components 🤞
Screenshot_2021-04-18-19-49-02-40.jpg
 
Last edited:
  • Like
Reactions: Nguyen Duc Hieu
Got it done, pretty sloppy job but everything is working. 🙏
Cost under $10 AUD

What to do with the 3 x 99 leftover SMD components 🤪

IMG20210424214741.jpg
IMG20210424222547.jpg
IMG_20210516_232435.jpg
IMG_20210516_232452.jpg

IMG20210516233343.jpg

IMG20210516233416.jpg
 

Attachments

  • IMG20210516233343.jpg
    IMG20210516233343.jpg
    866.2 KB · Views: 73
  • Like
Reactions: Nguyen Duc Hieu
Got another one,
Has anyone seen plastic insulation degrade like this:
View attachment 1759299View attachment 1759300

I didn't even notice it as I wasn't replacing the fan and the cable was tucked in nicely as it should on this 2011 21.5"

I had exactly the same thing on one of mine. Insulation was gone, totally brittle, it just dissolved.
I had to take the entire fan apart, and soldered new wires onto the fan PCB. Difficult to reach, but not impossible.

If your wires are still good, cut them and extend. Definitely easier. Make sure the insulation is not brittle, otherwise you can redo the job again soon.


When I powered on with the screen off to check the diagnostic LEDs I saw a flash and new something had instantly fried.

Turns out it blew a ferrite bead at L5710 and looks to have taken out its pad.
View attachment 1759321

Yes, this is due to the short circuit of the fan wires (+ and -).


This was the area I saw the flash, however after examining the board further I noticed this:
View attachment 1759325
C1603 and C1620 are gone, thinking it must have been related to the fan shorting?

This is unrelated, and they look knocked off. Likely some mechanical impact while mounting/disassembling/moving the PCB.



I carefully seperated the wires on the fan with scotch tape and hesitantly tested the fan in a 2010 and at least the fan is still working, although the corroded wire sheath is all the way down to the board solder joint and is brittle.
I'm thinking my best option for the fan is to cut the wires in the middle and heat shrink over both ends right up to the connection points except the twisted pair as it is fine, then solder the wires back together.

Hopefully I can find the 2 resistors and ferrite bead on AliExpress and get this going again.

CRITICAL-L5710-220-OHM-1.4A
C1603-22UF-20%-6.3V-CERM-X5R-805-3
C1620-10UF-20%-10V-X5R-603

Comments appreciated.

EDIT:
I think i got the correct components 🤞
Well done. Congratulations to your success!
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.