⟐ 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

⟐ Commented January 01, 2025 at 14:22 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 i power on i can hear the chime and then I can see noise on the black screen right before the white screen that has the loading icon on it. They are tiny multicolored specks that from afar look like vertical lines.

After this happens then the machine has a hard time booting. Sometimes it boots sometimes it doesn't. When I boot in safe mode it works every time and then occasionally I will see the noise while i am already logged on. When i boot in normal mode it will sometimes go to a black screen at the beginning of the boot and then the fans turn on at full blast "vacuum cleaner mode" i believe is what some of you guys call it.

I have searched everywhere for a solution and to pin point the problem. I have inspected the capacitors on the Logic Board and they are fine, not bulging or leaking. i have inspected the caps on the power supply and they are fine except that I missed the ones under the wiring harness. I will check on those asap.

Whenever I see someone with the same symptoms they almost always get the same response: Bad caps, bad power supply, bad logic board. I think it is the logic board but my question is: If in fact it is the logic board causing the problems, would the GPU be the cause of the problem? Has anyone tried to fix/ reflow these graphics chips?

I have seen it done on iBooks and laptops so I am wondering if anyone has tried it on iMacs. I have fixed many Xbox 360's this way and i have all the tools needed, but before I try it i want to make sure that a bad GPU would cause these symptoms and not some other part of the logic board. I would hate to buy a complete new logic board when all this one needs is a quick reflow.

⟐ Commented September 17, 2014 at 10:31 MST

Thank you

⟐ Answer accepted September 11, 2021 at 6:47 MST

I have a couple of vertical lines on my display - the number of lines are growing slowly(6 at the moment)

I mirrored the display on my TV , no lines there.

Is it the display panel itself or could be the wire connects the logic board to the LCD?

Or something else?

Thanks.

I did lot a research on the web, and figured there are lots of people who suffered from the same issue.

There are two possible solutions:

1. You buy LCD panel online and take it to a pc shop and pay for repair.

2. Make a lots of phonecalls to apple and if you pushy enough might get lucky and apple might fix it for you for 30-50$. They changed mine LCD. Said there was a factory defect on some of the LCDs for the G5s.

Give it a try! Good luck

Here's a useful thread to check.

⟐ Answer deleted August 08, 2014 at 2:29 MST

⟐ Commented July 22, 2016 at 16:55 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

thanks very much.

⟐ Answered February 01, 2015 at 15:29 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 December 14, 2009 at 9:54 MST

⟐ Answered August 27, 2020 at 6:01 MST

⟐ Answer accepted November 04, 2018 at 11:52 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

LED #4 RED is on after 2 minutes after start a machine.

Computer shutting off after LED 4 on red. Could not possible

to run ASD. CPU heat sink close to cpu very hot but upper

heat sink park cold.

Any ideas ?

Thanks

⟐ Commented November 20, 2016 at 15:12 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