IBook will not turn on at all

Question

Hello everyone, this is my first post.
My problem: I have a late-2005 iBook G4 1.33MHZ superdrive etc. I believe this is the last iBook Apple made before the MacBooks came out.
About a month ago, with no warning signs whatsoever (so slowing down, no fan wheezing, nothing) the computer just turned off and will not turn back on.
The battery was fully charged and the unit was on AC power when it happened. The green AC light still comes on and the green battery buttons will glow when I push the button on the bottom, but otherwise the machine will not even power up.
Unfortunately I'm no longer under warranty. I'm assuming it's the logic board.
The only other information I can give is that something bumped the left side of the computer about 2 hours before it shut itself off, but not any harder than other bumps my poor little computer has sustained.
Can anyone help?
Thanks,
Chris

Answer 1

Well two things come to mind, actually 3 but 2 are related.
First is the power chip U28 described here:
http://www.coreyarnold.org/ibook/
Diagnosable via pressure or shim as described.
The 2nd would be the GPU chip. It's an ATI Mobility Radeon 9550 4x AGP for the 12" and a 9200 on the 14". I have a 12" 1.33 board that has a dead 9550 chip and there are known failures on the 9200.
So on that same chip there are also BGA failures (the way the chip is soldered to the board) this can also be diagnosed by shim repair or by putting pressure on the chip from the top or the bottom. That chip is generally in the area on the top of the logic board under the option key.
Both problems can be fixed permanently by soldering in the first and reballing in the second case.
Richard
Message was edited by: spudnuty