Question about Apple PowerBook G4 Mac Notebook

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Powerbook G4 LCD White

I have a lighted white screen. Everything works fine. I've replaced the inverter and cables. I can see everything fine when connected to an external monitor. Could it be the lcd. I'm thinking that because the computer works fine on every other account...that it's not the logic board...but I could be wrong. I'm praying that it's not anyway.

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  • peachgroup Oct 15, 2008

    Clarification- Everything works fine on the laptop after installing the inverter and a new cable.But, I still have a white screen. Everything (shows up fine) and operates when I connect the laptop to an external monitor.

  • peachgroup Oct 21, 2008

    Thank you! I suspected the last two as possible problems. I have replaced the inverter and the cable. Still white. I just received a new lcd and will try that. In the event that it is the video that something that can be soldered, or do you know the location so that I can check it? Thanks again!

  • peachgroup Oct 24, 2008

    Hi Krabby!

    replaced the lcd. same problem. sooo, i'm thinking logic board. is there a fix?

  • Krabby May 11, 2010

    What do you mean when you say it works on every other account?



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Well you either have one of 3 things wrong with the computer:

  1. the video connector on the logic board is broken or not making a full connection
  2. the video cable from the logic board to the LCD panel is damaged.
  3. the LCD panel is dead

Posted on Oct 16, 2008


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The problem is fairly common and while you could test the long-shot possibility that it's not the inverter but the actual CCFL "bulb" (a tube really) that produces the light and sits in the bottom of the LCD panel, the chances are that it's a circuitry problem on the logic board. I've never had luck replacing inverters in these computers (though it works like a charm in PCs).

With the symptoms you have though, it might make sense to try the $20 inverter rather than replace the logic board. It's really quite simple. Just follow the instructions on THIS PAGE and select Apple MacBook Pro (even though you have a PowerBook it's almost exactly the same.)

It will walk you through taking the back off and pulling the LCD, but just notice that on Diagram #2 it shows you where the inverter board is. Just take it out, remove the two cables going to it and replace it with a known good one from eBay. It will be a great $20 way to check a cheap solution. After that fails, replace the logic board.

Or, for more fun, find another person with another laptop who doesn't mind you pulling it apart. Almost all 12" laptops will use a similar CCFL, so you can plug your LCD panel into just the two prong CCFL plug (shown in step 3 of the walk through). If you find someone else with a powerbook or iBook I know for certain that your screen's CCFL plug will fit.

So you could do all this or you could find someone on Craigslist to do it for you for a pretty cheap cost. Good Luck.

to peachgroup: if you have a lighted White screen, it is something completely different.

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