this post is only for people how did the same error like me.
this morning i powerd up my arduino BT with 9v on X1-1 X1-2.
yes i know this is very stupid...
but not as stupid as in the worst case.
so i have no money to buy a new one but i have time and i can solder smd.
my first impression is that the max 1676 is dead.
i power up with 5V i get 140mA of current and my power supply get on short cirquit.
huh 140mA...
and yes, it was the max1676, just power your arduino BT with 5V (BE AWARE OF POWER SUPLY INACCURACY) somewhere AFTER (5v pin connector, C7) the MAX1676 and it will still work! the Batt-low Led will light up but thats all, the rest works. ;D
have a nice day, yours _pest
p.s. it would be nice to have a good power supply (1,2v to 12v or something like that) on the next version of arduino BT... 79? up in smoke is horrible...