The power of my beat buddy mini suddenly off.I check the supplied power adapter its good
and i open the back cover …and board expose i see the R3 resistor is burned
Do you know the value of that resistor
I’m a professional Electronic Technician
If it’s still under warranty, might be better to replace it.
If not, and the resistor color bands are visible, you can get the value from https://www.arrow.com/en/research-and-events/articles/resistor-color-code
If a resistor ‘burned’ it’s likely another component which is faulted and caused the resistor to burn and isolating that faulted component and getting a replacement may be more problematic. I removed the back cover of my BB and didn’t see any resistors other than those mounted to the headphones jack. I suspect you removed a circuit board to see this resistor(?) Is the resistor in question of an SMD type as well as other components (I hate working on that stuff 
)?
As persist suggested sending the BB to Singular would be the best option to ensure a proper fix or replacement.
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I love working SMD type…i figure out that the AMS 1117 3.3V is shorted i ordered it online already
i hope this will solve the problem
thanks for all of your reply