820-00045 Only turn on when plugged in.

[Gordie Li]

Battery shows 100% when starts, then shows 98% 99% and then shows 100% in the OS, unplugged the power after turn on the mac stays on. Tried new Q4750 Q8952, which looks darker than normal. The problem stays the same after. Any help will be appreciated.

 

[2informaticos]

Please post accurate information.
Is really dificil to understand what you mean.
The machine only starts whern charger is plugged in, or need to press power button?
It stays on with battery if charger is removed, once powered on?
But never starts from battery alone?

 

[JohnB8812]

Yeah please make your post more clear on what is wrong. Also, I will warn you these always end in dead CPU at some point, so be aware of that.

 

[Gordie Li]

Please post accurate information.
Is really dificil to understand what you men.
The machine only starts whern charger is plugged in, or need to press power button?
It stays on with battery if charger is removed, once powered on?
But never starts from battery alone?

Thanks John,
It will turn on by itself (with out press the power button) if the power cable is plugged. Then unplug it will stay on till it time out and turn black. Then you press the power botton for 5 seconds, the lcd shows battery and charging icon, plug the power cord again, the mac turns on and show the login screen.
Hope this will provide more information.

 

[2informaticos]

Does it correctly show battery percentage when running on battery only?

Remove charger and press SW6900 for 10 seconds.
Also try PRAM/SMC reset.