Power Mgmt. Unit/Battery

So after much troubleshooting and help thru these forums, I've come to the conclusion the PMU battery (not sure of the official name) is dead. Causing my computer to shutdown randomly with no power source, and a strange reset to the date and time.
Anyone know how to change this battery/what type it is?
Thanks.

Hey Derek,
There is no battery in the iBook G4. Those settings are held by a super capacitor.
Here's couple of posts about it:"There's been a lot of problems lately on this group with the above mentioned issues. It could be a PMU problem. The PMU is actually a tiny computer within the computer. It's official designation is PMU99.
http://developer.apple.com/documentation/Hardware/DeveloperNotes/Macintosh_CPUs-G4/12inchPowerBookG4/2_Architecture/chapter_3_section4.html
"Power Control IC
The power manager IC in the 12-inch PowerBook G4 is a Mitsubishi M16C/62F microprocessor, also called the PMU99. It operates with its own RAM and ROM. The functions of the PMU99 include:
*controlling the sleep and power on and off sequences
*real time clock
*controlling power to the other ICs
*monitoring the battery charge level
*controlling battery charging
*supporting the interface to the built-in keyboard ( and trackpad )
The 12-inch PowerBook G4 can operate from a 15-volt power outlet on an airliner, however for safety reasons the computer will not allow battery charging. In order for the computer to detect the connection to airline power, the airline power cable should have a sense resistor of 24.3K ohms connected between the power plug's shell and ground.
The PMU99 also provides the hardware interface to the keyboard. Software in the PMU99 IC scans the keyboard, then sends the data to the system in packets like those from the ADB. To the system, the keyboard behaves as if they were ADB devices"
Try resetting it:
http://docs.info.apple.com/article.html?artnum=14449
If that doesn't work try what I call a deep PMU reset.
Pull all power including the battery, push the power button to remove residual charge in soft start capacitors.
Then walk away from it for at least 10 hours.
Now PMU99 has been responsible for soft start in Macs apparently since the first G3s and run all the way thru the G5s. From:
http://www.theapplemuseum.com/index.php?id=30
"Power Macintosh G3/G4/G5 clock/softstart chip: PMU99"
So this deep reset has worked for G3s going back to the Beige and recently a G4 Sawtooth with a 1.5 GB CPU upgrade."
"I've recently seen problems with the super capacitors that hold the settings on the PMU99 (this chip controls all the power functions as well as a .. well read about it:
http://everything2.com/index.pl?node_id=1325401)
Here's pics of the capacitor that I just put one up here, it's from a 12" G4 1.2 GHz:
http://www.photolava.com/view/d5pr.html
They're pretty distinctive, so hard to miss.
Here's the blowed up one from the 500MHz 12" G3
http://www.photolava.com/view/d5pu.html
Now that's blowed up"
There have also been some recent posts about bad DC in boards causing this symptom.
Richard

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Macbook Pro will not power on without battery installed

Hi there,
I have a Macbook Pro A1226 that fails to power on without a battery installed.
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But, if I am in OSX with a battery plugged in, shutdown the laptop, remove the battery while AC is still plugged in, it will power back on without any issues. But as soon as I remove the battery, it will not power back on using just AC.
Is this an I/O board issue, or a mainboard?
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Thanks

Any update on this? This is the same thing that's going on with my laptop right now. I was at the Genius Bar and they said they can send it in for repair. Takes 7-9 days and costs a minimum of $310. At the time I was there, my computer wouldn't start up at all, because the battery had drained to less than 20%. It didn't even start with just the power cord (no battery in). The "genius" finally got it to work by doing a PRAM and SMC reset. Got home and was able to recharge my battery to 100%. Used my computer for 2 days before I dared to take it off the power supply. Lo and behold, as soon as I take it off the power cord, then re-connect it, it shows "Not Charging". I tried to do SMC again, but no luck. Keeps saying "not charging". Even tried with a brand new battery. Do I have to get the I/O board thingy replaced?

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Hi
As far as I know if both parts (Battery and AC Adaptor) are plugged to the unit this can damage the battery or decrease the battery life. You should always remove the battery from the notebook if the Ac is plugged.
In your case I propose to remove the battery from the unit for a short time .
But in my opinion if it doesnt help I assume that its something wrong with the power electronic.
In this case your notebook needs a services.
Bye

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Thanks!
Interesting, this "Piggy back power adapter" will allow me to plug the fan into one of the ATA/IDE cables? Or do you mean the extra port on the power supply? (it has one plug for the outlet>G4, then another to support something like a monitor or similar) The G4 has a DVD burner, but no ZIP drive, so this is quite do-able if it uses the ATA power.
When you say "lower rear", do you mean at the bottom? Below the power supply, to the right of the PCI slots? If so, this is the inflow for the CPU fan! I can understand mounting it outside the current outflow-vent for the dead power supply fan, although I'm not sure the best way to proceed with attaching the fan.
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I have a 12" Powerbook G4. have been having problems with the battery, would charge fully, with coconut battery, would show 4081 as current battery capacity.
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I've followed the instructions
shift-ctrl-option-pwr button
After I do that (I've done it with the power cord connected, with it disconnected, and with it disconnected, and the battery disconnected). The time doesn't reset. I had thought that the time was supposed to get reset. Can anybody confirm that this? is there any way to know that the powermanagement unit has actually been reset?
Just want to try a few last things before spending the money on a new battery. btw, the computer is about 3 years old.
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This line:
Full charge capacity (mAh): 5893
and this one:
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indicate that the battery is healthy. However, the voltage, at 15961, seems high. However I can't compare to my PB17 right now because my daughter borrowed it.
Maybe someone who has their PB handy can compare their numbers.
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I updated to 10.4.9 about a week and a half ago. I don't know if that has anything to do with my problem, but before that, I had no issues with my battery.
Recently, I was using my Macbook, running on the battery, and with about 3:30 remaining, it shut off into sleep mode.
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So, I called AppleCare, and they told me to reset my PSU and PRAM. Surely enough, I was getting a correct reading for my capacity and charge.
I just charged my laptop before going to bed last night and I let my MacBook sleep while running on battery while I was at school. When I got home to use it, this is what the readings for my power were:
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This was about 10 minutes after turning it back on, mind you.
I tried to reset my PSU and PRAM...twice...but to no avail.
Is my Power Monitoring Unit faulty, or am I not reseting it properly?
Help is appreciated.
NOTE: This Power monitoring problem only seems to occur when I let my MacBook sleep for long periods of time (about 10-12 hours). Could that have anything to do with it?
MacBook (White) Mac OS X (10.4.9) 1GB RAM 80 GB HD SuperDrive 2.0GHz Core 2 Duo

I am going into the Apple store tomorrow.
I have done 7 PMU Resets and 5 PRAM resets, all to no avail.
I swear, this battery is faulty. Please post new updates if you can. I may not be able to log on and reply because I'm having connection problems. Post any suggestions you can, other than a PMU or PRAM reset - those HAVE NOT AND WILL NOT WORK.

Abrupt loss of power, no low battery warning

a familiar story, but haven't been able to dig up a solid solution in past discussions--so perhaps a fresh suggestion...? (thanks in advance!)
okay, so one moment the battery indicator shows 45 minutes remaining; the next, my tibook puts itself to sleep or shuts down entirely. and when i plug it back in--yep, the battery indicator shows a 0% charge.
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PowerBook G4 (ti) Mac OS X (10.3.9)

maybe the power mangement unit on your logic board is broken?
The more people experience the same symptoms, the more I doubt it.
did you do all the resets pram etc?
Yes, of course. To no effect.
While I am trying the "trick" described above by SuperSizeIt (discharge until forced sleep + sleep for another whole day + recharge to maximum), please: everybody go to SystemProfiler and check their capacity. Is it going down from charge cycle to charge cycle, as in my case?
Initially I had: 4200 mAh
After just six cycles in three weeks: 3176 mAh
So the drop is more than ~170 mAh/cycle. I would consider a few mAh normal, but certainly not this much!
Now, I would like to know whether this symptom is just part of the problem described in this thread, or an additional one.
Powerbook G4 400 Mhz Mac OS X (10.4.4)

Installed new Power Supply unit.

For the past few months I have had the Sleep/Wake, Start-up problems wih my 1.8Ghz 20" G5 iMac, no iSight, no ALS, that so many G5 iMac owners have been experiencing, until it would not start up at all. No visibly bad caps on the logicboard but at least 4 bad caps in the Power Supply. I cleaned all the dust out of everywhere & I have finally gotten a new Power Supply unit, & installed it today, also changed the CR2032 lithium battery. I am ready to start up and I wonder what procedures should I perform to make sure I have covered all the bases to be back to normal conditions. Do I need to reset the SMU, reset the PRAM, Repair Permissions, run Apple Hardware Test on the Install Disc, etc.?
As usual, all suggestions are greatly appreciated.
Thank you,
John

hi Ralph,
Well, i started up & everything seemed to work OK, put it to sleep for about 20 minutes & woke it with the mouse, which I haven't been able to do for quite a while. I ran Apple Hardware Test from the Install Disc & everything Passed, hooray. Then I opened Disk Utility , chose "Macintosh HD" & ran Verify Permissions. A long list of "Permissions differ on ..." came up, starting with a "User differs on...".
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Permissions differ on./Library/Application Support/Macromedia/Shockwave 10/Shockwave 10 Preferences, should be , they are
Permissions differ on ./Library/Internet Plug-Ins/Flash Player.plugin/Contents/Info.plist, should be , they are
Permissions differ on ./Library/Internet Plug-Ins/Flash Player.plugin/Contents/MacOS/Flash Player, should be , they are
Permissions differ on ./Library/Internet Plug-Ins/flashplayer.xpt, should be , they are
Permissions differ on ./Library/Preferences, should be , they are
Permissions differ on ./Library, should be , they are
Permissions differ on ./private/var/log/secure.log, should be , they are
What thet should be & what they are are a lot of r's, w's & x's. I didn't type here what it said they are or what they should be because I don't know if there might be a security risk or not. Probably concerned over nothing.
Anyway, should I Repair Permissions or are they supposed to differ.
Thanks again for your help.
John

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Thanks, Grant
Interesting opinion.. and funny too.
On close inpsection of the fron panel you're right the cable is a hard drive cable, and without a number. Whereas the connector for the DVD and Zip drive are numbered P7 and P6.
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How to set "Energy Saver"- Setting for Power Adapter or Battery?

Under the System preference, how do I need to set the Energy Saver? There are options of Power Adapter or Battery for the Setting for. What is difference?

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Reset G4 Quicksilver Power management unit

Powerbook G4 Mac OS X (10.4.3)
My G4 won't start. It may be the Power Management Unit. I want to rest the PMU. I can find nothing on resetting the power management unit on a Quicksliver desktop G4.
Any suggestions?
Jay Leonhart

I am having similar problems looking for the quicksilver pmu instructions, but these should be close.
http://docs.info.apple.com/article.html?artnum=95037
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21 September, 2014: MD513AE/A iPad Wi-Fi-16GB White - Model A 1458 I have purchase this from Dubai, UAE, some 2 years back. ---- I am NOT able to switch it on; when connected to power supply, the battery icon comes in but no signs of charging.

21 September, 2014, from India.
MD513AE/A iPad Wi-Fi-16GB White - Model A 1458
I have purchase this from Dubai, UAE, some 2 years back.
I am NOT able to switch it on; when connected to power supply, the battery icon comes in but no signs of charging.
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Sometimes a picture of cable and ITunes comes in; but not able to connect to
P C as there is no battery charge.

Hi madhu254,
Thank you for visiting Apple Support Communities.
If your iPhone is not charging, please check out this article.
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Exactly Same issue my Windows 7 Pro - Elitebook HP8470p : HP Power Assistant - No Battery Found -
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Is it possible to change Power Supply unit for Lenovo H420 PC ?

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Hi RBec and welcome to the community,
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My 13.3" macbook pro will not power up.The battery indicator light does not come on.The Mag safe charging light flickers green and red dimly.I had a cell phone connected to the USB port.

My 13.3" macbook pro will not power up.The battery indicator light does not come on.The Mag safe charging light flickers green and red dimly.I had a cell phone connected to the USB port.

This didn't work for me, so I did a bit of searching and TONS of pages later in google, I found an answer. Here are the steps for people who also were in my situation:
1. Take off bottom case
2. Unplug battery - blurry image here: http://i.ytimg.com/vi/03cC79r5Dx4/0.jpg
3. Press and hold power button for 5 seconds
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5. After shutting down again, reconnect the battery and close the case up
6. It works! (hopefully, if you guys had the same situation I did)

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