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PowerBook G4 will not turn on when using just the battery

1

1300beetle

macrumors newbie
Original poster
Oct 8, 2008
8
0
London
My PowerBook G4 will sometimes not turn on when using just the battery, if i connect the AC power supply it will power up but it then gives me a message saying your time and date is set incorrectly.

Also when i try and shut down my laptop with just the battery connected it shuts down without giving me the usual options Restart, Sleep, Cancel and Shutdown

I have tried resetting the PMU, swapping the battery, purchased and changed the PRAM battery none of which have solved the problem.

Any thoughts or ideas welcome.
 
1300beetle said:
My PowerBook G4 will sometimes not turn on when using just the battery, if i connect the AC power supply it will power up but it then gives me a message saying your time and date is set incorrectly.

Also when i try and shut down my laptop with just the battery connected it shuts down without giving me the usual options Restart, Sleep, Cancel and Shutdown

I have tried resetting the PMU, swapping the battery, purchased and changed the PRAM battery none of which have solved the problem.

Any thoughts or ideas welcome.
Click to expand...

Maybe the DC board is bad. Do you see it charging?
 
Reflow said:
You say that you have another battery. What happens when you install it samething?
Click to expand...

When using my old battery i get the same problem, i have used a volt meter to check the volts and it reads just under 12V currently trying to test the amps but seem to get nothing i guess its current limited?
 
1300beetle said:
When using my old battery i get the same problem, i have used a volt meter to check the volts and it reads just under 12V currently trying to test the amps but seem to get nothing
Click to expand...


Can you remove the battery while plugged in. Does it work. Also do you have another PB to test the batterys on?
 
I was about to suggest the PRAM battery, but obviously switching it out didn't help.

Perhaps the connections of the PRAM battery are damaged? The symptoms sound very much like PRAM damage - especially the date/time thing.
 
Reflow said:
Can you remove the battery while plugged in. Does it work. Also do you have another PB to test the batterys on?
Click to expand...

Yes it still works when you remove the battery. Unfortunately i do not have access to another PB to test the batts
 
Metuas said:
I was about to suggest the PRAM battery, but obviously switching it out didn't help.

Perhaps the connections of the PRAM battery are damaged? The symptoms sound very much like PRAM damage - especially the date/time thing.
Click to expand...

Both ends of the PRAM battery conection and the surrounding area all looked good, no track damage or conection damage.
 
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