Thread: Dead zumo 550...

I bought a bricked zumo 550 off eBay. The unit was and still is fully dead:

- No response to the power button
- No response to an external power source (power net adapter)
- No response to a USB cable (also not when battery removed)
- No response to pressing the power button and the '+' button simultaneously
- No fix after removing and reinserting the battery
- No fix after briefly shorting the internal battery (see post #8)
- The replaceable 3.7 V battery has a voltage of 2.6 V (2x)
- The three battery contacts inside the battery compartment show a voltage of 4.7 and 5.0 V when the unit is connected to an external power source
- The internal non-replaceable battery (second last picture in post #8) shows good voltage (can't remember anymore exact value and I don't feel like opening up the unit again just to check)

Any other suggestions besides using the zumo as a paper weight?


Edit:

Originally Posted by smokefree

- The replaceable 3.7 V battery has a voltage of 2.6 V (2x)

After 24 hrs charging, the battery voltage now reads 3.9 V (2x).
Tried the "short circuit trick" again, but still no luck.
Gave me the opportunity to measure the internal battery voltage: 3.1 V.