How to fix a broken G4 iBook logic board problem

G4 ibook motherboard fault.

There is a problem with the logic board in the Macintosh G4 ibooks. It can appear after a year or more in some machines and the symptom is that after being on for a few minutes, the screen goes black (it looks blank, but the light has gone off) , the fan turns on, and the computer freezes. You might think it is a problem with the display but it’s actually a problem with one of the chips on the main motherboard. This article describes the problem and how to repair it.

What models are affected?

I conducted a survey (thanks to over 300 readers who participated!) to see which model g4 ibook had the problem.  The results are here and it appears that every  iBook model can develop the blank display problem.

Thankfully the Aluminium power books don’t have the problem. In fact the powerbooks from this era are a great design, the 15 inch Aluminium G4 powerbook is one of my all time favourite macs – I still have one.

The original 2003 ibook G4’s (800/933/1Ghz) have the fault.

The “Early 2004” (1Ghz) models up until Oct 2004 have the same motherboard.

The 60G (1.2Ghz) “Early 2004” model and all the “Late 2004” model ibooks (1.2Ghz/1.33Ghz) and Mid 2005 (1.33 and 1.42Ghz) have  different logic board (built in airport extreme)-  but they still have the fault – even models with the new logic boards are affected!

What is the fault?

One of the chips heats up and cools down each time the computer is turned on and off, so that eventually a small stress crack appears on one of the pins. When the computer heats up and parts expand, the crack opens up and the power does not get through. This means the display goes blank and the computer freezes. If you press the plastic case of the ibook in just the right place, it can put enough pressure on the chip so that the pin makes contact and the computer will power up again. In fact, here’s a crude DIY repair method involving a shim where you open the laptop and put a piece of rubber on top of the chip to press it down:



Here is another DIY solution is that involves clamping a g-clamp onto your iBook – I would not recommend this one it will place all sorts of physical stresses on the iBook internals!



Here is a photo of the fault developing. (from here: ENGF959-orig). You can see the thin black line running below the lead which is a crack in the solder.

Picture 1.jpg
I rang Apple and they don’t acknowledge that the problem exists. They have officially ‘never heard of it’.

The repair!

You need a fine tipped soldering iron to heat up the top few pins of the chip one by one and resolder them to the logic board. Press the chip down while you apply a very clean and fine soldering iron tip to each pin.

Don’t attempt this one unless you have had some soldering experience – or you are ready to say goodbye to your G4 ibook if something goes wrong!
Here are some pictures:

Computer with bottom case off

The G4 ibook with the bottom case off. The offending chip is circled.

ibook with bottom case off

Closeup of chip

Here is a closeup of where I have soldered the legs of the chip. You can see the base of the top pins are shinier and a little fatter from the new soldering. I soldered the top 3 or 4 pins on each side, but it’s only the top 2 pins that the fault occurs with as they are the main power pins. I applied a little more solder to the joint as well, that’s why it looks a bit lumpy.

TYou don’t need to apply any new solder to the chip. Just apple some solder to your soldering iron to clean it. Then wipe the iron clean on a rag. Then gently touch the iron to the legs of the chip for about 3 seconds each leg to melt the solder down onto the joints again.

Here is a close-up of the chip you are soldering.  Solder the end with the little circle on it. Solder the top 2 legs on each side.




As pointed out in the discussions below, once your ibook is fixed,  or if your G4 iBook has not yet developed the fault, you might want to take out $10 worth of insurance by buying this little app.

It turns your fans on earlier and lowers the internal temp of you ibook. You can set the temperature lower so that your fan turns on a little sooner to keep the iBook cooler.

If you repair your iBook be sure go make a post below. So far there have been lots of successes and no failures at all!


159 responses to “How to fix a broken G4 iBook logic board problem”

  1. Phil


    My brother gave me an old iBook G4, saying it had motherboard problems, but I am able to start it up in firewire target mode. Just now, I found your web site, and pressed down on the left side, and it started up! when I let go, it froze, and since then I am not able to do it again, on start up, I see the Apple, and the spinning disk, but then it freezes … I am going to read more and then see what I can do.


    Phil in Costa Rica

  2. robert

    My iBook G4 1.42Ghz running OS X 10.4.11 Tiger purchased new in August 2005 was fine up until May 2009, started experiencing problems with screen going black, battery not charging and frequent crashes. I replaced the Battery with a new one from Apple at a cost of $129 and got another 4 months out of the laptop before problems again resumed, frequent crashing and erratic battery charging. When system prefs was opened and looking at power management the sliders were moving back and forth as the screen would flutter and dim until finally crashing. Now after being pluged in to charger for over a week still no charge on the brand new battery, my iBook occasionally will start to boot up when pressing power but soon crash usually before the desktop screen becomes visible, guessing it’s starting up on just enough battery left but crashing because no actual charge on battery. I have read much about the logic board being the problem but I have a thought that it may be a problem with a battery management script enclosed within updates to the OS from Apple. I have seen aftermarket “external” battery chargers on eBay for the iBook battery and am confident that if I purchase one of these I could charge the battery so the laptop would at least turn on and be useable but still no idea why it wount charge past 50% before going dead and not recharging with original charger. Is Apple sneakily trying to “kill” off it’s older hardware in hopes of selling new? I really don’t know just that the way the iBook acts seems very odd and I’m trying to use some human logic in an attempt to diagnose and hopefully repair for continued use.

  3. Ger

    Brilliant, fixed my wife’s iBook G4 by re-soldering pins 1 and 28. I has used the shim solution for a while but it didn’t last. Fingers crossed for now.

    I have a second iBook G4 that freezes after 10 mins or so from cold. When I reboot a few times it doesn’t make it past the ‘blue screen’ freeze. Do you think the solution I tried on the other iBook would work on this or is it a differnt chip problem altogether.

    Thanks in advance for your response and thanks loads for taking the time to post this info which has helped so many, including me. :-)

  4. Frank

    Another successful rescue of an iBook G4. I had tried the spacer solution, but it worked erratically. After reading the stories above, I decided that all of the messing around with electronics I’d done as a teenager was enough soldering experience to give this fix a shot. I filed down a soldering tip to a narrow point, coated it with some solder, touched it to the #1 pin for no more than 2 seconds, and presto, a working iBook once again. Thanks to everyone here for sharing their experience.

  5. My trusty iBook G4 is under my fingers as I type this message. It serves me very well as my one and only traveling computer, which these days means it serves me over 95% of the time. It’s a terrific laptop. If…

    All of the following is just my personal opinion: I admire Apple, and own a bunch of Apple stock. But it is not a perfect company. And they demonstrated that with their remarkably crass and destruction decision to kill the installed base of iBook G4s, with conscious intent. A decision they continue to support. It was and is nothing less than a criminal act, I’m very sorry to say, and they’re rather lucky they haven’t had to pay too badly for it.

    iBook G4s die because Apple elected to kill them rather than allow their fans to make noise. They knew all the iBook G4s would succumb quite early in their lives due to very high internal temperatures. And those temperatures were quite literally trivially easy to manage properly. But they faced a problem: The fan is noisy. They didn’t want waves of fan noise complaints, or to be known as a company that made a laptop with a noisy fan. Maybe they wanted a longer battery life specification too, who knows.

    So they elected to set the internal temperatures so high that the fan would almost never run, even though they were well aware that all the iBook G4s would die early in their service lives because of that decision. And that’s what they did. It was a conscious decision. It cost many people the price of their iBook G4s. Any in many cases their data too, if they didn’t back up regularly. And they continue to support that decision today – the latest Mac OS still sets the iBook G4 internal temperature so high that the fan will almost never engage, so the laptop literally cooks itself to death.

    Sooooo. You can fix your iBook G4. But you must also purchase and install G4FanControl, by Andrea Fabrizi, at It’s about $8 last I looked. It’s trivial to install, and to use. Set your three internal temperatures to 40, 39, and 42 °C respectively. In my opinion. You can set them anywhere you want. You could even set them rather high to minimize your fan noise, as Apple did, in which case your repaired iBook G4 will die quickly again. I strongly recommend that you set them to 40, 39, and 42 °C respectively. As Apple should have (and still could, and absolutely should, with an absolutely trivial Mac OS 10 correction).

    You must also repair whatever internal hardware died due to the blast furnace temperatures Apple set for the iBook G4. Any of a number of things could have failed. But the power converter IC’s solder joints seem to generally succumb first, followed by ball grid array solder joints and the hard drive.

    If the hard drive is dead, it’s a goner, so replace it. Here’s a page which illustrates how to disassemble the iBook G4 so you can perform internal repairs. It focuses on hard drive replacement, but access to the hard drive will of course also provide access to circuit board components such as the especially vulnerable power converter IC:

    Even if the solder joints on the power converter IC aren’t dead yet, they are almost certainly compromised. So resolder them.

    I use the wonderful 331 type organic flux based solder for the re-soldering job, plus lots of extra organic flux brushed into the work. Then I thoroughly wash the circuit board when all my work is complete. The Kester 331 type organic flux is highly conductive and corrosive, and must be completely washed away. Fortunately, it’s also fully water soluble. And it’s the only flux that makes true precision soldering work possible.

    I scrap away all the solder mask from all the copper associated with pins 1, 2, 19, and 20, then add a lot of solder – as much as I can flow onto all the available copper – to create heat escape paths and heat dissipation surfaces. I also dress the overlying flat cable away from the IC, so it no longer thermally insulates it. And I add a strip of heavy copper foil to the top of the IC which overhangs substantially to the side opposite the battery, to provide another heat dissipation path.

    It takes surgical skill and devotion to do a thoroughly good job. (And that’s just not possible without organic flux, no matter how skilled and precise you are.) But the reward is a genuinely reliable repair.

    In my case, both of my two iBook G4’s needed the power converter resoldering job, the first, which is under my fingers now, because the joints had failed outright, and the second because they were in the process of failing. The first also required a hard drive replacement – it now sports a 160 GB drive from Applied Times (, a local consumer electronics store here in Miyazaki, Nihon.

    But the second iBook G4 has a more sinister problem, possibly a ball grid array solder joint failure under one of the large ICs. Possibly the G4 processor, or the big IC next to it (maybe the GPU, I don’t recall now). That iBook G4 remains disassembled, awaiting further attention back home in Oregon. Maybe I’ll ship the motherboard to Superior Reball and Rework which Simon described in his 6 March 2009 post above – that looks like a very good way to resolve the problem.

    But the first one, under my fingers now, running at 40, 39, and 42 °C respectively, has been rock solid – it runs like a champ, and I have full confidence in its reliability. The fan is noisy. But that doesn’t seem to bother me – I’ve just grown accustomed to it.

    When the iBook G4’s fan is run rationally, it’s a terrific system (but unusually difficult to open for service). But when its fan is run as the Mac OS instructs, it’s a very short lived toaster oven. Which is extremely wasteful. And stupid. And sad…

    If for whatever reason any of you prefer to sell your iBook G4 rather than repair it, I might be interested. Maybe… If so, please flag me at Bruce at my domain

    Regards, Bruce

  6. peter

    Quick way to do this job. I made a mess re-soldering the pins and started to mop it up using solder wick. After the mop up all pins were shiny and neatly resoldered on one side, so I flooded the pins on the other side and mopped that up as well. This method gives a good heating to all the pins to get rid of cracked solder joints and also provides a fresh thin layer of solder on top. Quick and works well, brought it back to life. Also you dont need a tiny tip, you can use a normal tip.

  7. Bill

    It works! Great fix. Saved a machine. If you aren’t equipped for and experienced in micro soldering, don’t try. As noted above, Instead use the shim method described in the ‘iBook G4 logic board fix at

  8. James

    I had a 12″ iBook G4 from 2005, and I got the kernel panic because of the faulty airport/bluetooth module. I removed it, and now the machine is running fine (except for no airport). However, D-Link has drivers for their WUA-1340 USB Wireless adapter, so I have set up that machine to work with wireless internet again.

    I now am using a 14″ iBook G4 from 2004, and last night I got the OTHER problem! I’m going to try to solder the joints tonight, but I solemnly vow that I will NEVER purchase an apple computer again. For this kind of unreliability and poor engineering, I’d rather pay half for a cheap-o PC!

    1. Keep in mind James that (a) your computer is now six years old and (b) it is an iBook which was the bottom of the range cheap computer designed to compete with cheaper model PCs!

      So if you want a long-term reliable Mac you really need to go for a PowerBook, (MacBook Pro). For an iBook ( or MacBook) six years is actually a pretty good run.

  9. hexdiy

    Really great tip! A friend of mine had a machine with the black screen syndrome described here, and he suspected a faulty LCD cable. Seemed odd to me, because I expect that to mean a white or distorted screen. And the backlighting was obviously working as well. Only beta testing right now, but all indications are the 12″ iBook on my table right now is in perfect working order after resoldering pins 1 and 28! I should have googled before spending hours testing and prying through the magnifying glass. Thumbs up and recycle the planet!
    Hexdiy, Belgium.

    1. Say what? Resolder what pins? Why don’t you just replace the cable?

  10. Herbert Gramsch

    I just resoldered the chip on my ibook G4 800 MHz the second time, the last time i repaired it in the same manner half a year ago. Next time I’ll try the trick with the heat sink like shown above…

    Much cheaper than a new computer…

    Herbert Gramsch
    Dogern, Germany

  11. coucke

    What’s the solution for A G3 iBoook (700mhz/128MB/20GB/Combo – Ethernet/2002 Apple with the same problem? – – – – – D24 chip found but no result.

    1. cat

      That’s the one I have. I don’t know if it had exactly the same problem as these, but they were part of the recall/extended warranty for the failure of the logic board a few years back. When mine went, it sounded just like here — graphics going nutty across the center of the screen, then blank. Apple fixed it for free, since it was part of the recall, but for all I know this might have been the problem. I had to have them fix it twice, btw (second time they replaced the video cable as well, though I’m not sure it was necessary).

      Oh, and the fan never ran. Fried my hard drive after one year. Luckily Apple still honored the logic board warranty even though I replaced the hard drive myself. Kind of shocking, that. Also weird that once I put it back together, the fan did run. I had NEVER heard it before then.

      Worked okay for about three years after that, despite being repaired by an Apple-trained monkey the second time (rerouted my wires wrong through the hinge, which made the display unreliable and killed the built-in mic). Then the hard drive failed — again. Replaced with another. (Worked dandy after that, until I managed to kill it by mistake while fixing the wire routing problem. Still working up the nerve to try to solder it.)

      I have several other macs that have all worked brilliantly. But that one is a big fat lemon. You probably need to replace the logic board; you might be able to find one online. Good luck, anyway. You’ll need it.

  12. Elbistan

    I have had this problem with my G4 for quite some time. The soldering worked perfect. Thank you very much.

  13. Susan Crowell

    I like my ibook G4 a lot, also some of the data on it, but it exhibited the symptoms described regarding the fan issue. Not starting at first. I could only hear a whir, then it would start up and everything was fine. This was intermittent. It started about two months ago. Two days ago it completely died. I press the power button and nothing. I can’t afford the repair rates nor am I in a place that even services apple products without an hour and a half drive. I don’t want to give up if there is any hope of fixing it. I have no experience with soldering if this ends up being a solution. If I could find someone who was willing to give it a try and if I could translate some of the suggestions here, what level of experience with soldering would this person need? Thanks, quinne.

  14. Foxy

    I did the solder fix on by iBook 1.2GHz just over a year ago and it’s still running fine :) I actually bought it from a friend after it had failed (and she had been informed that logic board was finished) but I have saved it :) Just added the G4fancontrol software after reading about it above. Seems like a bit of insurance! I don’t use the iBook much now – about once a week – but would rather it kept going for a few more years.

    It has started to run slower of late though – even after fitting brand new 1Gb ram. I am thinking the HDD may be starting to die – was replaced only 2 years ago I think (by last owner) so not that old, but having read how heat issues may shorten the HDD life too I am thinking may be time to do again. Was considering one of the new Solid State ones (SSD)- as I don’t need to store much data anyway and would appreciate speed and silence (albeit with more fan noise now…) over storage space.

    Anyone put a SSD in an iBook?

  15. Kat

    HUGE massive THANKS to you all for this!!!

    Just revived my beloved g4 ibook following these very thorough instructions. One note: my chip is oriented differently on the motherboard, but was able to figure out which chip it is by matching the numbers surrounding it w/ the numbers in the pictures you provided.

    All I did was press on the chip and BOOM!! RESTART!! No solder necessary…will see if this stays, if not, will open it up again and solder.

    Before the final crash, I was reviving the computer by squeezing the battery, and baffled why that made a difference. Now I understand I was squeezing the motherboard through the case.

    Thanks again!

  16. Felisha

    How do I open the back of my mac I book to get it to looklike that

  17. Evan

    Thank you for putting this together. I ended up using one of the other quick fixes (spacer), but I’d never have found out without this how to. My mid-2005 iBook G4 is still going strong 5 years on thanks to your careful research!

  18. Derek

    I found this site while trying to repair my G4 and I am so glad I did. This fixed it right up, Thanks!

  19. rcran

    Worked for me! Thanks very much!

  20. bayyagg

    Am now holding my G4!
    i’ll try this solution and will come back if it is successfull!

    Thank you very much for the info!
    I was about to rip it apart and sell it by PARTS!

  21. Steve A

    Thanks for the fix. I was working on a Logo Design when my 933mhz IbookG4, crashed. Since I didn’t feel comfortable soldering the chip I siliconed a piece of rubber on the back. I was able to save my files and my computer is working again.
    I plan to have someone do the permanent solder fix for me soon.

  22. Alastair

    Help! – I’m trying to do this fix on an iBook G4 1.33 but the motherboard is slightly different and I can’t work out which is the troublesome chip. Anybody know ?

    1. Can you email or post a piccy? It’s the ISL 6225CA IC.

  23. dominic

    Anyone want to purchase mine. I was told at the mac store that this was the problem as noted here in this article. I have replaced it and don’t know what to do with the old one

  24. Chris


    This kind of problem has been a pet peeve of mine for years. In the manufacturing of electronic circuit boards, the soldering process happens on a conveyor belt and is known as “wave soldering”. Within this process, the amount of solder can actually be dialed in on a control panel. Unfortunately, I assume it must be to cut some costs or something, but the amount of solder that gets on the connections are NEVER really enough to actually sustain a good contact for the long term.

    All companies care about is that the product lasts long enough so that the warranty won’t expire before the connection breaks down. In other words, it is PLANNED OBSOLESCENCE and the top people of the company do these things on purpose so that you have to throw away your old unit to buy a new one later so that the company can continue to sell more product and you have to constantly buy buy buy making them rich rich rich.

    The statement of them “never heard of that before” is a crock of crap. They are bold-faced lying to you to your face! It should be an insult to your intelligence if a company rep tell you that. Call them on it and demand they fix it. You don’t have to put up with it. You don”t have to fix their mess that they designed in on purpose to rob you of having a long lasting product. If you complain hard enough to the right people, they will do it. Make them do it, it is their responsibility.

  25. WOW! Thank you so much, I did exactly as said and it worked like a charm. Hopefully it will last.

  26. I have similar issues with my 12″ iBook.
    It doesn’t like to be touched, because when you set it down on a counter while it’s on it will Kernal Panic.

    Anyone have a fix for the 12-inch iBook 1.33GHz?

  27. WdLvW

    Thanks greatly for documenting this issue and it’s cure, for I never would have found it myself, my chip didn’t really look that bad to a visual inspection or a poke, but retouching the last four pins on each side: 1-4, 25-28 has returned my 800Mhz iBook G4 A1054 from black-screen, no chime, full fan basket case to the reliable machine it had been up until a month ago.

    Kudos, and to those who have documented the case cracking proceedure as well.

  28. Aerien

    Okay, had an apple store close by. Went there with my trusty companion (ibook G4, 1.33 GHz) who started having weird issues: vertical lines on the display in white, grey and black; long booting times with a black screen at first, then the spinning wheel on grey background, then not finding the HDD and in the end freezing on a blue background. I did manage to get it to boot it in safe mode once, but now it just refuses to work. So the nice apple guy at the apple store took a look at it and told me that the logic board pretty much snuffed it and my baby is DOA. He told me to sell it on ebay as they no longer have parts and repair is not an option.

    Now before I do that…. is my problem also connected to the faulty soldering or is it something else completely? I just want to know whether I should just go ahead and take out the HDD and sell the carcass, or if it is worth the trouble of finding someone to solder it for me…
    Had I known about the too high temperature and the fan settings before, I might have saved my ibook. I was always wondering why the casing got so hot left of the track pad… now I know….

  29. Henry

    It seems that my Powerbook G4 1.67 got exactly the same symptoms, but I couldn’t find the chip you’ve indicated.
    I’m already using MBP for a long time, but still missing the old reliable PowerPC, want to make it live again.
    Really helpful topic, I’ve searched for the solution for half year and this is the nearest one I’ve found.

  30. JohnHovan


    I just finished repairing a g4 with problem you describe. It is very difficult to solder on that little chip. I was able to place a jumper wire from the power pin over to the red fan pin. They are both 5v. After this repair, I continued to have issues. I had to lay a solder iron on the remaining pins and reflow them without trying to re-solder them. Be sure that you do not have any solder on your iron when you try this.


Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.