Thread: Try to charge, LED flashes orange once, phone doesn't boot?
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caco3 is offline caco3
2011-05-10 , 22:10
Posts: 560 | Thanked: 423 times | Joined on May 2010 @ Switzerland
#16
Originally Posted by shadowjk View Post
Flashes are the battery charge chip signaling error.

Just connecting d+ d- together doesn't make bme think charging is happening..

However, having all pins properly connected and then disconnecting gnd or +5V might make the charger chip immediately stop charging, but enough voltage to remain for several minutes to make bme think there's external power available.
Hi shadowjk

Do you have more experience with this short orange flashes?
I am building my own external battery with a small DC-DC converter, making 5V out of 2x 3.7V Li-ion cells.
When I put my N900 on, I get 2 or 3 short orange flashes. The phone sais its getting charged, but no current flows. Having a look on my oscilloscope shows that my 5V are steady (as designed), but every time the orange light flashes I can see a power surge ( <2ms) and the voltage drops quickly down to 4.1V. This could be just due the needed power for the LED or it could also be the "intelligence" of the bme.

Any clue how to get it charging despite of that?
My dc-dc converter can supply 5.0V constantly with a load up to 1A, so that cant be an issue.
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