Shuts down on external power, runs fine on battery.
Macbook Core Duo 13" A1181 (820-1889 logic board)
On battery power my Macbook runs normally. With magsafe connected, no light appears on the plug and the battery does not charge.
With the battery removed, magsafe plug shows green led and machine will boot from cold and run for about 15 mins, then shutdown. Restarting immediately results in a shutdown during or just after the chime(!).
However, removing the magsafe for a few seconds and replacing allows about 2 mins before shutdown, and disconnecting for longer periods before restarting gives longer run times up to a maximum of about 15 mins.
Thinking at first it was a temperature issue, I have done the following:-
complete strip down and cleanup;
new thermal paste;
replaced heatsink (old one had cracked board at the sensors);
renewed and re-routed the heat sink temp sensor leads;
PRAM reset;
SMC reset;
HD check and repair permissions;
RAM reseat.
Also tried swapping in known good magsafe board and battery connectors from a working machine, and running with all ancillaries disconnected.
iStat reports normal temperatures throughout, and the shutdowns happen no matter how many programs are running, or how much the processors are working.
Any ideas?
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4 comentários
Can you cool down (refrigerate) or heat up (heating blanket) the system? If you can see if the system reacts the same way. Also try turning down the displays brightness to the lowest that you can still see the desktop and see if that alters anything.
por Dan
Tried refrigerating down to 5 deg C and turning the backlight to minimum. Made no difference.
por Bob
What happens when you heat it up before you turn it on?
por Dan
Interesting. Tried heating with an a electric blanket. Would not start up either on external or battery power. Left it to cool for 20 mins and it started (with battery disconnected) and ran for 4 mins only. Replaced battery and it started again and has been running happily for an hour.
por Bob