⟐ Commented June 12, 2015 at 22:38 MST

Has anybody ever replaced the (25) capacitors instead of the whole logicboard?

Looking for a brief guide as how to do so. I have done some electronics soldering but would appreciate further guidance, especially on how to remove the capacitors and any rule of thumb/trics/

⟐ Answered November 12, 2011 at 16:11 MST

Push the power the switch on fan’s and harding working HDD but start sound not working and display give’s black screen.

⟐ Commented December 27, 2020 at 7:16 MST

have just opened up my g5 1058

The short version of the story is that i've bought this as a dabble into the world of mac's. The story was won't power on...so I opened it up and found 6 definitely bulging caps. I've read this is common to these models and would like to have a go at replacing them, I've also read that you guys think this is a difficult repair job! So.. ? Have you any masterful hints and tips to remove them as the common thread is that it's difficult with these layered boards. Any help greatly appreciated.

also read a few articles about this on badcaps.net and one linked from previous questions which suggest "rippling"..now I'm not an engineer, I'm an ordinary citizen and I was lost after the first hyperbolic graph and accompanying abbreviations. My general understanding was that all? the caps will need replacing, and so will the PSU as this is the source of the "rippling". Am I on the right track here or am I confused?

⟐ Answered September 27, 2012 at 14:45 MST

Originally (and suddenly) he couldn't get it to boot properly.

• Got the "tone" and the white apple screen . . .
• Then a blue screen . . .
• Then black . . .
• Then blue again . . .
• Then back to black but can see the cursor

Sometimes he could get it to boot but after trying to do anything it would go all "funky"

Example:

• File windows wouldn't navigate properly - any action like resizing or scrolling caused ghosts on the screen
• The cursor has a little clear stripe running vertically through the middle of it . . .
• There's also a something like a box of vertical black line dots flickering around the cursor many times

Also it would get the gray "need to restart computer" screen in 4 languages when ever trying to open a program or even sometimes without doing anything

• * * *

After trying a bunch of stuff like running Disk Utility and Applejack I was able to stabilize it enough to where when opening with "Safe Boot" he could back up the files he needs to save . . .

I did a soft re-install of the operating system . . .

Still didn't boot properly unless in "Safe Boot" . . .

I've since done a clean install including wiping the hard drive . . .

Still doesn't boot properly without Safe Boot and the cursor is still messed up . . .

Does anybody have any ideas for me?

I needed to boot from "Installation CD" for Disk Utilities as well as both the re-install and the clean install . . .

Still had and have the graphics problems

After the erase and clean install I'm sure it's some kind of hardware problem . . .

The only thing that really changed after all the things I did before is that once I can log in I don't get the gray screen telling me to restart

⟐ Edited September 25, 2010 at 18:46 MST

when pressing power button on g5 imac it makes startup noise but the screen does not do anyting and then it shuts itself down after about 10 seconds

⟐ Answered July 09, 2018 at 8:58 MST

⟐ Answer accepted February 12, 2014 at 14:43 MST

At first i thought it was overheating, so i opened it up and cleaned all the fans and vents to make sure there was no excessive dust and that they all spun freely.

I put it back together, and i've noticed that sometimes i'll power it on and it'll shut itself off after 5 minutes, other times it'll allow me to capture a video from my camera, convert it, and then burn it to disk.

Sometimes it'll happy run for a few hours, or even a few days, other times it'll not last the aforementioned 5 minutes.

Because of the mass variance in uptime, i'm not convinced its a PSU problem. Because i was able to get it to work pretty hard with the video capture/encoding/burning, i'm not convinced its over heating. plus, after having laid eyes on the cooling components myself, and having given it a jolly good clean (not that it really needed it), i'm even more convinced its not an overheating issue.

I reset the PMU and PRAM after reading about it online, but it still occurs.

I'm at a loss, and not really willing to take it to someone to get charged an arm and a leg for an overly simplistic diagnosis of faulty power supply.

What say you?

⟐ Answer accepted April 19, 2018 at 4:47 MST

⟐ Answered August 27, 2020 at 6:01 MST

Got this system in today.

Heres the issue: When you first turn it on and it works fine. After a second boot (eg, reboot) it fails to boot after the startup chime. Works fine if you leave it unplugged for half an hour and then try.

Heres what happens when you start it up a second time:

• LED 1 green
• LED 2 green
• LED 3 Off
• LED 4 Red
• LED 2 turns off

Fans speed up and are cut off by shutdown.

Okey Doke. I replaced the Thermal Paste on U22 and on the CPU, it works like a charm!

iMac G5 17" Model A1058 Logic Board Replacement

Hope this helps someone else.

⟐ Edited May 07, 2018 at 5:44 MST

I have tossed the logic board. I still have the display, the power supply and the inverter. I need to know the voltage that each pin on the inverter takes to power the back light on the iMac display directly from the power supply.

The following links may be helpful to someone who speaks French.

http://forum.macbidouille.com/index.php?...

[ http://users.skynet.be/fa835376/pas%20a%...]

⟐ Answer accepted November 22, 2013 at 17:57 MST

⟐ Answered December 24, 2010 at 14:21 MST

yes, I did enable the PSU with the jumper pins as indicated in the article you mention.

⟐ Answer accepted January 20, 2014 at 19:20 MST

Thanks, Greg

⟐ Answer accepted November 02, 2013 at 12:33 MST

I am using a radioshack (RS) 30 watt soldering iron and a RS 45 watt de-soldering (DS) iron.

I opened the other holes of excess solder by holding the hot de-soldering iron on the backside of the motherboard and pushing a small safety pin through from the frontside. This method was difficult and required some time and force. This was not effective at freeing the broken legs.

What are my alternatives?

Is there a way to use these blocked holes as is?

I believe the equipment I have used is may be too low in wattage and made my work more difficult than necessary. Would a more powerful iron make it possible to clear the holes?

Should I put it under a drill press and try to drill them out?

⟐ Edited May 24, 2013 at 15:39 MST

Thanks!

⟐ Answer accepted November 03, 2013 at 8:11 MST

Currently, my symptoms are constantly running fans, and the inability to sleep. If I hit the sleep button, the machine instead switches off without any kind of warning- not a good thing. So I'm willing to bet that the cap on the board is related to the fans, and I guess that there's probably a bad capacitor in the power supply as well.

So, here's my questions:

1) Once one cap goes, how long is it before the other capacitors start dying? And is there any way to prolong their life?

2) Has anyone repaired the caps before? I've got a friend who's really good with a solder iron, so I might be able to twist his arm into helping me out. How difficult did you find it to replace them?

Thanks!

⟐ Commented May 06, 2011 at 8:41 MST

I spent most of the day yesterday replacing the 25 1800 uF and 1000 uF capacitors on my mother's old A1058 iMac G5, trying to resurrect it. 6 of the capacitors had obviously bulging capacitors.

Before the replacement, LED 1 would light up, then LED 2 would briefly light and go out. Now LED 2 lights up solid, but LED 3 doesn't light up. I reset the SMU, still can't get LED 3 to light up. LED 3 is supposed to indicate that the screen and the CPU are in communication, if I recall.

I did manage to get a hold of an external display adapter and the iMac is perfectly happy connecting to it, that display works fine! In fact, I have confirmed the iMac G5 does now boot, it just can't seem to talk to the internal screen.

Any suggestions on what could be interfering in the communication between the iMac motherboard and the internal screen and how to test for it? I have been told the LCD displays DON'T generally fail. I imagine it could be the inverter, but don't know how I would test for that.

⟐ Answered August 22, 2016 at 8:12 MST

⟐ Commented June 12, 2020 at 14:52 MST

Then when I try iMovie it says; the same thing as iPhoto and we have done the same thing, but nothing.

Lastly, when I try to open iTunes it says; "The file 'iTunes Library.itl' cannot be read because it was created by a newer version iTunes." And I can't do anything to fix it. Please, help!

⟐ Answered January 04, 2017 at 7:43 MST