Power Mac G5 DP1.8GHz - Bad Logic Board or Power Management Issue?

I have a Power Mac G5 DP1.8GHz/1.5GB/80GB which I bought non-working. It has not yet been disassembled or examined by a certified tech. This is it's issue (which replicates): the computer powers on. It makes a single warning tone, then the LED flashed at least 15 times (too fast to count). Then the posting chord is heard. Hard drive spins up. Then nothing (no video). Won’t boot from any disk. I have changed the RAM and tested the RAM banks with known-to-be-good RAM from another DP1.8GHz G5. The warning tone stopped once or twice after this switch, but then it didn’t chime. I changed the PRAM battery, but not with as new one. However, after installing the used one and then resetting the PMU, it displayed video briefly for the first time. While installed in the other 1.8GHz G5, the hard drive was formatted, given a clean install of OS X 10.4.11, and then moved into this computer where is never mounts. The computer is not accessible through TDM.
Do I have a bad logic board? Bad CPUs? A power managment issue? A RAM issue?

Through my own trial and error troubleshooting, I have found the CPUs to be in good working order and the logic board passes the Apple Service Diagnostic every time. Despite the installation of numerous pairs of modules that worked in another DP1.8GHz, the computer has a RAM issue-it gives the "no good RAM" tone most of the time when it powers up (after a PMU reset it does not). Also the computer boots from disk or into Open Firmware but the disk utility can't see either hard drive so I may have a bad SATA controller.

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Power Mac G5 DP1.8GHz Logic Board Replacement

I have a Power Mac G5 DP1.8GHz with a bad logic board. I was told there was an extended replacement program in place but find no mention of it on the Apple Suport pages. Is this true or am I too late?

Hi Toolshed4-
There is a program for power supplies. To determine if you are eligible look here: Power Mac G5 Repair Extension Program for Power Supply Issue
If no joy and you must the part check here: G5 June 2004 Dual 2.0 & Dual 1.8 PowerMacs Replacement Parts
Luck-
-DaddyPaycheck

Is a bad logic board due to a bad power supply?

Computer specs:
iMac G5 20", 2.0 ghz, 1 GB RAM, 250 GB hard drive
Back in October of 2008 my iMac G5 Power PC shutdown intermittently and then when I went to go to start it back up, it booted to the blue screen and hanged there forever. So, I did a hard shutdown and then waited and then booted again and it still hanged at the blue screen. I tried booting in Safe Mode, and that worked, so I had a chance to backup everything that I needed to. Then, I took the computer to my local Apple Store to speak to a "genius". They could not diagnose my computer while I was there, so they needed to take it overnight and let me know over the phone what the issue was. The next day they called to tell me that it was a Logic Board issue and that it would cost $900 to fix it. I obviously was blown away at the cost for the problem, and I could not afford that charge so I seeked out other options. I found a shop in my neighborhood that offered me a used 1.8 ghz logic board for half of what Apple was quoting me, so I went with it. Then, 9 months later (which brings us to present) my iMac completely shutdown on its own and would not start up. I ran it through some tests (LED lights on the interior) and confirmed that it was a Logic Board issue again. So, I took it back to the shop in my neighborhood and they told me that the warranty for the part they replaced had expired. So, I called Apple Customer Relations to talk to them about the issue. They confirmed, using my serial number, that I could get my issues fixed for free. They then told me about the "iMac G5 Repair Extension Program for Power Supply Issues" which was news to me. This Program ended in December of 08, meaning I would have qualified in October of 08... the time I initially brought in my computer. So, I brought my computer to the Apple Store to drop it off for repairs, and when going over the history of the machine they confirmed that because there was a used 1.8 ghz part in my machine installed from a non-authorized Apple place that they COULD NOT fix my issues now.
My question is:
Back in October of 2008 when I brought in my computer to the Apple Store and they diagnosed it with a bad Logic Board, could that have been because of a bad power supply? If that was the case, does a bad power supply cause a Logic Board to go bad?

Welcome to Apple Discussions.
The short answer is no, but it's actually more complicated than that. The original iMac G5 17 and 20 inch models were plagued by two problems: defective capacitors which affected the logic board, and an unrelated set of defective capacitors which affected the power supply. Rarely were both conditions present at the same time, but Apple decided—when they issued the repair extension authorization—that replacement of both components was a more cost effective approach. By far, the most common of the two problems involved the logic boards.
The REA covered machines for a period of three years from first sale, and ended in December of last year. Yours likely would not have been covered due to the date of sale provision. On a case by case basis, AppleCare representatives did allow coverage for machines beyond the three year limitation, but not past the end of last year.
It's not likely that you have both a defective logic board and power supply, though you may. The combination of these issues is actually found most frequently in the iMac G5 ALS models, none of which were covered by a repair extension authorization.
Your issue is a difficult one, as Apple authorized dealers and service providers have every right—and, actually, a responsibility under their annual agreements—to reject warranty, AppleCare or REA coverage for parts or labor when compatible but not similar logic boards have been placed in your machine. This is because they must exchange these parts for the part they are requesting from Apple on a like-for-like basis, and that part must be associated with your machine serial number. In trying to resolve your issue, the shop in your neighborhood actually created an additional issue for you which would only be triggered in the event of component failure. I have no idea what period of coverage they typically offer, but Apple provides for 90 days or the balance of any warranty or AppleCare extension in place at the time of the repair, whichever is greater.
Your logic board can be refurbished for $ 189.00 if it in fact exhibits the capacitor issue. That process is covered by a one-year warranty. If you are interested in exploring that option, send a message to the electronic mail address in my Public Profile and I will reply with additional information. To help determine additional information concerning your machine, please include the machine serial number if you elect to do write for more information.

Powerbook G4 titanium bad logic board

HELP, my second computer is a powerbook G4 15" and i have been told i have a bad logic board. is it worth replacing or should i put the $500 toward a new one? Also coould a bad logic board cause other problems in the future? what happens to make a bad logic board? what does a logic board do?
thanks for all the info.
Macbook Pro Mac OS X (10.4.9)

Hi Tour Man,
Welcome to Apple Discussions.
Which model TiBook do you have? Especially if it's one of the earlier models (400-667VGA), I would certainly not spend $500 on it, as you would probably not be able to sell the entire machine for that price.
If it's a later model (667DVI-1GHz), consider what you use it for (if you have it fixed, how long is it going to serve your needs?), the capacity of the HD, how much RAM you have, whether there's a wireless card or DVD burner, the condition of the battery, whether USB2 and the many other "updates" a new machine would offer are important to you, etc.
It's not likely that a bad LB would cause other issues.
A LB (same as "motherboard" in PC land), is a circuit board on which most of the essential elements of a PB are soldered (CPU, GPU, RAM slots, etc), so when any one of these has issues, the repair is to replace the entire LB (specialized equipment is needed to work on the micro-circuitry, so it isn't something a repair shop can repair).

How can you transfer files from an iMac with a bad logic board?

This is in reference to my "Nothing but a blue screen at startup!" post. He took his iMac to an Apple authorized repair shop and he was told that the logic board was shot. He has decided to get a new iMac but he's wondering about all the photos and other files he has on the old hard drive. What are the ways that he can get files from the old hard drive on to his new one when he gets it? Thanks in advance for your help with this!
Eric

Hi Eric!
roam's method is a very good one!
I don't know if this will work because of the bad Logic Board, but another way, may be to use Firewire Target Disk Mode.
The ailing iMac would have to be Firewire enabled, and you would need access to another Firewire Mac.
Good Luck!
ali b

Display problems, bad logic board?

Hi I'm a first timer here! I have a iBook G4 14" 1.33ghz laptop I am fixing for someone. When it boots up, the screen looks like you are watching TV with old rabbit ears. You can make out the mac logo and what not, then the screen goes blue, like the basic blue background, and it looks perfect, then once the desktop comes up, it all fuzzy again. I've replaced the LCD screen, AND the lcd cable that connects to the logic board. Same results. I guess the last part would be the logic board to replace? Does anyone have any suggestions?
Here are some links to the pictures to show you what is going on...
http://www.tylersweb.net/mac/1.jpg
http://www.tylersweb.net/mac/2.jpg
http://www.tylersweb.net/mac/3.jpg

inverter board controls brightness, the lines in your pics look more like the logic
since you have a stick of RAM, try another module or maybe remove it if you have on-board RAM
would be good to connect to the external display if the adapter is available - it would confirm bad logic board if the same lines are on the external display, it wont completely rule out the board though if there are no lines

Bad logic board VS starting as target drive!

Hello,
if someone has a bad logic board on a G5, can they boot the G5 as a target drive? witht the help of another computer? (not sure if the logic board
Michel

Hi, Michel. I suspect that whether or not Target Disk Mode works will depend on what the logic board's particular problem is. If it doesn't work, be sure to remind the user that removing the hard drive from the faulty Mac will allow her to extract any data she needs from it, by installing it in or connecting it to another Mac. In many models, removing a hard drive is easy.

Will apple replace a faulty or bad logic board on my 2013 MacBook Pro?

I have a late 2013 13" macbook pro that has been diagnosed, by a non apple provider, with a bad logic board. The place where i took it suggested getting that confirmed with Apple. I have an appointment tomorrow at my local apple dealer...
but am worried that this practically new laptop is toast or going to be very costly since I don't have applecare!! Any help for me????

my late 2013 13" pro also has a bad logic board. The diag said it was a memory failure. I'm 3 months out of warranty and had it sent to the repair center for $280 plus tax. I don't feel like the logic board was defective I just didn't catch it in time. I tried a restore a few months ago and it worked better because i was in Yosemite beta since the developers beta and I thought the issues were because of the betas. It has constant panics and restarts but I was trying to get by until now it wouldn't turn on and disk utility said the hard drive was not mounted and it wouldn't let me restore It. maybe there are a few more people with problems then there should be so soon.

Can't boot G5, bad logic board?

G5 Dual 2.0 Ghz, 4 GB Ram
Can't get past blue screen unless I boot in safe mode, then I can get in.
Here's what I've tried:
5 different boot volumes, including Tiger and Leopard and a clean install
internal drives only, external drives only
reseated ram
zapped pram
zapped nvram
reset pmu
booted in single user mode, gets stuck at workaround bonjour unknown error 0
pulled out airport card, reseated airport card
tried just about everything, always stops at the blue screen with cursor
does this sound like a bad logic board or is there anything else I can try? thanks

Dear Mr. Jarrett,
Just analyzing: You're not able to boot normally from any installed system on any hard disk, but you can boot in the single user mode, are able to use AHT and the G5 even boots from the TechTool disk.
However, you do not state you installed those five systems mentioned recently, so the question is: How stable is your computer booted from a DVD (grey install disk or the TechTool bootable disk and are you able to do a fresh system install now?
I don't think your RAM chips are bad, but there could be a problem with (one of) the SATA cables connecting the hard drive to the logic board. Did you try both data cables (by using the second drive bay)? As you undoubtedly know a PowerMac cannot boot from an external USB drive, but having a bad internal data cable could also prevent starting up from a FireWire drive. And take a critical look at the four guide screws: are they well fitted?
From your description I understand you own a dual processor and not the late 2005 duo core G5. These computers are very different animals indeed.
Success and best regards,
Robbert
Message was edited by: Mechanic man
Message was edited by: Mechanic man

Using external monitor with a bad logic board???

Can you use an external monitor on your ibook, if you have a bad logic board, to use it? Or is the only solution to use the shim, or get it fixed. Thanks.

Hi, and welcome to Apple Discussions.
If the graphics chip on the logic board has come loose, it won't drive the graphics to an external display, either. Sorry.

Power button connector torn off the logic board

During what seemed to be a routine repair I tore the power button cable connector off the logic board. Is there anything that I can do now that does not involve installing a new logic board?

Hey iBookfragger and Welcome to Apple Discussions,
Here's a pic of a 12" 1.33 board I have here in my repair pile:
http://tinyurl.com/7s4epq
verify with a continuity meter that these points are connected on yours.
I then solder two tiny stranded wires to the SMT devices at the points indicated and lead those wires to the ripped socket contacts.
It's a lot easier and requires a much less steady hand than Duane possesses.
In addition some of these sockets leads didn't stick out as much as these for the 1.33 and are pretty much completely hidden under the socket itself.
These sockets were fragile. These were held physically to the board with the two solder attachment pads near the back. Others were epoxied to the logic board and the tabs were soldered to the traces.
I recommend not removing that plug when swapping out the hard drive. It's been ripped off the board too many times around here. Me included!
Richard
Message was edited by: spudnuty

Power Mac G5 FW 800 Bad - Columubs, Indiana

Hi,
Anyone living in Columbus, Indiana with a Power Mac G5 Machine that I can test my LaCie external Hard Drive on? Here's the problem. My Power Mac G5 doesn't reade my LaCie Bigger Disk when I use my FireWire 800 cable. It does however, read my LaCie Bigger Disk when I use the FireWire 400 cable, or my USB cable. So, either my Power Mac FireWire Port is bad or my LaCie Port is bad. I've tried two different FW Cables and have the same problem, so I know it's not the cable. On my LaCie I have two FW 800 ports and I have the same problem no matter which port I use. My guess is that my Power Mac 800 port is bad, but to make sure I need to plug my LaCie into another machine - iMac G5, or Power Mac G5.
To test my LaCie on another machine means driving up to Indy or Bloomington. I'd rather test it here in Columbus and if it's my computer then I'll make the drive to repair it....
Please contact me at: [email protected]
Thanks,
Tom
Power Mac G5 Quad Mac OS X (10.4.5)

Feel sure you will have tried this - but just in case...
From Macintouch:
http://www.macintouch.com/readerreports/firewire/topic2188.html
Mike Mihalik, LaCie
Seems like the FireWire issue needs to be revisited quite often. Here is my often repeated suggestion which appears to clear up many FireWire issues: reset the FireWire ports. Panther has a Finder Preference to show mounted volumes on the Desktop. You must set this for mounted drives to be visible. Please follow these instructions to reset your FireWire port.
http://docs.info.apple.com/article.html?artnum=88338
Here is a summary:
* shut down and disconnect all external drives and peripherals ; make sure nothing is connected to the FireWire ports
* use Apple Disk Utility to repair permissions on your internal boot drive
* shut down and disconnect the AC power from the computer as well as the drives; if laptop, also remove battery
* let sit unpowered and unconnected for 15 minutes
* reconnect AC power to only the computer (battery too if laptop)
* restart computer
* verify that FireWire ports are visible within Apple System Profiler
* reconnect FireWire drive (only one); refresh window within Apple System Profiler to rescan the FireWire bus; confirm that drive is visible
* confirm drive is OK by using Apple Disk Utility and apply First Aid
* repeat for other drives, one at a time

Power Mac G5-Bad dimms/bad logic board?

I recently have tried to install 1 gig of RAM into my power mac G5. It only has 2 dimm slots available, the other two hold the 256 mg of RAM that came with the computer. When I install the new RAM (purchased through apple) the computer gives me a grey screen with a whole lot of writting that I can not get past.
I ran a hardware test with just the original RAM in and everything passed.
I tried to run a hardware test with the new/original RAM and was not able to.
When I take out the new RAM, the computer runs fine.
I then switched the new RAM with the original, leaving 2 slots empty and the computer started up fine. I tried placeing the original RAM in the 2 slots, filling all 4, and this time a black screen came up repeatedly.
Should I just max out the only 2 DIMM slots that work? Is it the 2 DIMM slots that are failing? I am sure it is not the RAM after many conversations with apple, but am worried it is my logic board..and I just stepped out of my one year warenty..(siiiiiiigh)
Any advice would be great.

What are the specs of the new ram vs. the old ram? It sounds like you may have mis-matched ram modules that won't co-exist with each other. Where did you get the new ram?

6-month old Mac Pro has already had a new logic board and power supply

At a cost of $400 in shipping and a one-month wait, my 5-month old Mac Pro got a new power supply and logic board
Now I keep getting kernel panics, runaway kernel_task in Activity Monitor, and corrupted boot drives
External Firewire drives work some of the time, and occasionally my USB devices dont work either
This computer is a nightmare - how do I begin to figure out if this is OS (10.6.4) or hardware related?
The extended AHT test reports that all is OK - as does an extended memory test using Applejack
Should I do firmware updates and re-install the 10.6.4 combo pack, or am I just wasting more of my time?
I've got 4 macs and this is the only one that works badly - I think Apple's OS updates are getting as bad as Windows updates

My first question is why you spent $400 to get a 5 month old system fixed. That should have been covered under the warranty. So someone ripped you off, or you left out some key details.
And if you had both the logic board and PSU replaced, did you ever stop to think that maybe the problem lies with the power coming into your house? It's not really the big power spikes or blackouts you need to worry about, since those are pretty rare. What you need to worry about are the small fluctuations in voltage that happen several hundred times a day, if not an hour. Sometimes there's not quite enough power, other times there's a little too much, and all of this takes a steady toll on the PSU. It will do what it can to try and feed the rest of the computer a steady diet of electricity, but sometimes a jolt will get past it and start damaging other components. It could even cause data corruption on your HDD.
If the PSU and logic board already went, who knows what damage it may have caused to anything else. It may just be taking longer to show up.
It might also be that whomever ripped you off to the tune of $400 simply traded you one defective logic board for another. Or maybe they don't really know how to protect against ESD. I once saw a repair shop where the techs smoked in the same room they did the repairs. Sadly, for every one good tech out there, there's probably at least 3 complete idiots. Kind of like auto mechanics.
And I never have problems with Windows or Apple updates. Seems like on Windows the majority of people who have problems with updates are either running some program designed to change the way Windows looks or messes with low level system files, or they have a malware infestation they were unaware of/oblivious to. Most of the people who have problems with Apple updates seem to be the same way. They're running some truly bizarre programs that mess with the system in ways programs were not intended to mess with the system. There's generally a reason OS vendors provide an API for developers. You deviate from that at your own peril.

Logic board and power supply symptoms on a Mid 2007 I Mac Intel

does anyone know what would cause my Mid 2007 Imac to quit abruply? On tun on the super drive spins up for about 5 sec and then spins down. No display No Nothing!! It was working fine up to this point. Could it be the power supply or logic board?? What other componants are in there that would cause this problem.
It is my daughter- in- law's Mac and they don't have alot of money to fix it so if I could fix it that would help.
THX for Ur Time!!

Unfortunately no one hear can truly diagnose the problem.
1. Run the Apple Extended Hardware Test using the original Install DVD 1 that came with that iMac.
Intel-based Macs: Using Apple Hardware Test
2. Call your local Authorized Apple Service Provider and have them test it.
How to find your nearest Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD)

Power Mac G5 DP1.8GHz - Bad Logic Board or Power Management Issue?

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