Sudden shut-downs

Hallo,
I also encouter that sudden shutting-down problem on my 12" iBook 1,33 GHz PPC G4.
I've read a lot of threads in here on related stuff.
To be exact
* I had both shut-downs and display-darks, on power-supply and on batteries.
* I ran extended AHTest, it reports everything is fine.
* Power Supply colors behave ok.
* Battery does go up to 98% only. I had a replacement, it counts only 45 cycles.
* Slight tweaking or shaking the machine doesn't reproduce prob's nor help.
* Closing and opening the screen solves the display-dark issue.
So what i would like to find out is, if there is a way to tell if it's a logical board issue or a dc-in-board issue; before deciding for a replacement part or a replacement machine.
p.s. some lines quoted from system log that may tell sth:
(shutdown resetted date. reboot was at "Jan 1 02:00:33")
Jan 1 02:00:34 localhost kernel[0]: ApplePMU::CLOCK RESET! PMU WAS PROBABLY RESET SOMEHOW!
Jan 1 02:00:37 localhost kernel[0]: ApplePMU::PMU forced shutdown, cause = -127
Message was edited by: mono-mac
Message was edited by: mono-mac

Hey mono,
Closing and opening the screen solves the display-dark issue.
It might be that you have a reed switch problem (or an inverter cable problem more difficult to repair).
If you raise the keyboard and open up the ram shield, in front of the RAM are two connectors. The one closest to the display is the trackpad connector the other one further toward the front of that is the reed switch connector. I have a 1.33 12" logic board here and can identify the connector but since it's apart I can't tell if there's enough room in there to be able to pull that connector.
Maybe a tweezers with a long right angle tip.
In the service manual the trackpad connector has 4 blue wires and the reed switch connector has a red and black. If you can disconnect that plug that could solve your problem. The worst thing that would happen is that your iBook would not go to sleep when you close it.
So another test of the reed switch would be the next time it goes dead pass a magnet over the area just inside of the foreward edge of the CD slot about 1" to the right near the bottom of the keyboard. If that solves the problem it's most certainly the reed switch.
Richard
Message was edited by: spudnuty
Message was edited by: spudnuty

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