New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

 
Start a Discussion
 

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

Join the conversation RSS
Apple Notebooks Apple's notebook computers including MacBook Pro, MacBook, MacBook Air, PowerBook, and iBook.

Powerbook G4 hardware issues


Post Reply New Thread Subscribe

 
Thread Tools
Netherfox

 
Member Since: Jul 08, 2012
Posts: 3
Netherfox is on a distinguished road
Mac Specs: iMac 2.5Ghz, iPad 2, Powerbook G4 Alum.

Netherfox is offline
Hi all. I have a 12" Aluminum Powerbook G4 1.5 GHz, 512 MB RAM, that has two issues currrently keeping it out of working order, and I'd like to be able to get it working again for a family member who doesn't need a newer computer.

1) The screen is completely dark, but you can still make out screen images and print in light, especially sunlight. From what I have read online, this is a problem with something called an inverter, with which I am not familiar.

2) Whenever I boot up, even if I try to boot up from the install disks, I get an "invalid memory access" message.

I have a new memory module on the way to make it smoother, so I'll be able to try it out with that soon, but I also don't believe it's the replaceable memory that's the problem, because when I remove it, I still get the invalid memory access message. From what I've read on this issue, it seems this can be due to problems with on-board memory, video memory, or the logic board. Unfortunately the issue is not covered in sufficient detail in any thread I've found so far. I guess what I'm looking for is more of a detailed walkthrough to determine what the problem is and what I can do to fix it.

Thanks,
Netherfox
QUOTE Thanks
Netherfox

 
Member Since: Jul 08, 2012
Posts: 3
Netherfox is on a distinguished road
Mac Specs: iMac 2.5Ghz, iPad 2, Powerbook G4 Alum.

Netherfox is offline
I should mention too that my system clock appears to be set to the year 1904.
QUOTE Thanks
pigoo3

 
pigoo3's Avatar
 
Member Since: May 20, 2008
Location: U.S.
Posts: 26,558
pigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond reputepigoo3 has a reputation beyond repute
Mac Specs: 13" MB 2.4ghz, 2gig ram, OS 10.7.5

pigoo3 is offline
Quote:
Originally Posted by Netherfox View Post
I should mention too that my system clock appears to be set to the year 1904.
Need new PRAM battery for that.

- Nick

- Computer slow, too many "beachballs", read this: Beachballs
- Computer seems slower than it used to? Read this for some speedup tips: Speedup
- Almost full hard drive? Some solutions. Out of Space
- Apple Battery Info. Battery
QUOTE Thanks
techiesteve

 
Member Since: Apr 24, 2009
Location: UK
Posts: 478
techiesteve is a glorious beacon of lighttechiesteve is a glorious beacon of lighttechiesteve is a glorious beacon of lighttechiesteve is a glorious beacon of lighttechiesteve is a glorious beacon of lighttechiesteve is a glorious beacon of light
Mac Specs: MacBook Pro 15" 2.8 GHz, MacBook 2.16 GHz, iPhone 5

techiesteve is offline
Your Powerbook has some serious problems. Sounds as if you have an inverter problem. The inverter board is a long rectangular PCB under the clutch cover in the display assembly. This Powerbook isn't as easy to work on as the 15" and 17".

If the date and time doesn't stick after entering, it won't be the PRAM battery, as this Powerbook has similarities to the iBooks, no PRAM battery. They use a very high value capacitor soldered to the logic board that will hold a charge just long enough to save settings while you change a battery. If your main battery is shot or not fitted you will lose date and time when disconnecting the power adapter. See Portable Computers: Models Which Do Not Have a Backup Battery.

Your error message sounds as if the have a defective logic board.

Steve Bell
UK
QUOTE Thanks
Netherfox

 
Member Since: Jul 08, 2012
Posts: 3
Netherfox is on a distinguished road
Mac Specs: iMac 2.5Ghz, iPad 2, Powerbook G4 Alum.

Netherfox is offline
Thanks for the responses. I received my additional 1GB stick of RAM and added it, I'm still getting the same message so it's not that. Process of elimination I suppose.

I was thinking about it. I think the time got reset when I tried to reset the PMU a couple of weeks ago. I had forgotten I tried that so maybe there's nothing to it other than that.

With that in mind, is this still likely a logic board issue?
QUOTE Thanks

Post Reply New Thread Subscribe


« Macbook pro won't start | Macbook turning itself off? »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
Known hardware issues aan Apple Notebooks 1 03-11-2008 01:20 PM
powerbook motherboard issues excalibur313 Apple Notebooks 0 01-08-2008 02:31 PM
Powerbook G4 Charging Issues CAUTION5697 Apple Notebooks 3 12-12-2007 11:57 PM
Powerbook G4 12" charging issues... SuB8HaVeN Apple Notebooks 4 01-02-2007 07:40 PM
Cruzer Micro 512mb: PowerBook Issues xwonderboy85x Other Hardware and Peripherals 0 09-14-2006 11:19 AM

All times are GMT -4. The time now is 06:43 PM.

Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
X

Welcome to Mac-Forums.com

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!


(4 digit year)

Already a member?