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New G4 iBook charging problem

Message #1 - Posted 2005/11/15 - Peter Scott

Summary: I have a G4 1.3GHz less than a week old. Just now after leaving it to charge overnight I found it extremely hot, the fan was going, and when I opened the case it failed to respond until I power cycled, whereupon it restarted normally.

Detail: I customarily charge iBooks by letting them go all the way to 0% and black screen before plugging in, in order to maximize battery life. (Maybe there's a problem with doing that, although I never had a problem doing that in over 2 years with the G3.) This was about the 6th charging cycle for this new machine. I plugged it in around 9 last night, and came to it at 7 this morning. The fan was going, the entire bottom was hot, and the snoring light was not on. Yes, it was properly closed. I charge it on its side leaning against the wall so the bottom gets plenty of air.

When I opened the case the screen was blank and there was no response to any keys until I held the power button down several seconds and then pushed it again. I got a normal startup and a popup saying that the machine had crashed and wanted to send a report to Apple. The detail alluded to a kernel panic. I looked through /var/log and couldn't find anything relating to this except for a line in crashreporter.log:

Tue Nov 15 07:16:00 2005 crashdump[82]: crashdump invoked as panicdump

The battery was fully charged and appears well calibrated. The Energy Saver is set to sleep after 20 min, put display to sleep after 11 min, hard disk whenever possible, reduced processor performance.

Being hot like that suggests to me that it thought it wasn't closed, because my G3 would get very hot when I was using it while it was plugged in. And the snoring light wasn't on. Yet it was quite closed and the display was dark. Any ideas?

Message #2 - Posted 2005/11/15 - Joe Heimann

Peter Scott wrote:

Summary: I have a G4 1.3GHz less than a week old. Just now after leaving it to charge overnight I found it extremely hot, the fan was going, and when I opened the case it failed to respond until I power cycled, whereupon it restarted normally.

Detail: I customarily charge iBooks by letting them go all the way to 0% and black screen before plugging in, in order to maximize battery life.

That would be the proper method to use if your iBook battery used NiCd cells, but the iBook uses LiIon cells. Those have between 500 to 1000 full recharge cycles and can be recharged at any point of discharge. They will last better if charged back up after partial use. About once every few months do what you have been doing, that recalibrates the power manager's estimate of remaining charge on the battery.

(Maybe there's a problem with doing that, although I never had a problem doing that in over 2 years with the G3.) This was about the 6th charging cycle for this new machine. I plugged it in around 9 last night, and came to it at 7 this morning. The fan was going, the entire bottom was hot, and the snoring light was not on. Yes, it was properly closed. I charge it on its side leaning against the wall so the bottom gets plenty of air.

When I opened the case the screen was blank and there was no response to any keys until I held the power button down several seconds and then pushed it again. I got a normal startup and a popup saying that the machine had crashed and wanted to send a report to Apple. The detail alluded to a kernel panic. I looked through /var/log and couldn't find anything relating to this except for a line in crashreporter.log:

Tue Nov 15 07:16:00 2005 crashdump[82]: crashdump invoked as panicdump

The battery was fully charged and appears well calibrated. The Energy Saver is set to sleep after 20 min, put display to sleep after 11 min, hard disk whenever possible, reduced processor performance.

Being hot like that suggests to me that it thought it wasn't closed, because my G3 would get very hot when I was using it while it was plugged in. And the snoring light wasn't on. Yet it was quite closed and the display was dark. Any ideas?

Sounds like the sensor could have shifted in the iBook's housing so that it did not think it was closed. Other than that, no idea.

Joe

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