I was testing this unit out on a project I put together and was having trouble getting it to lock in.
It had been working just fine on my computer using a USB to serial converter.
So I disconnected it from my project and connected back on to the converter and nothing. The red LED did not come on and no serial data.
After doing a little checking it appears the 3.3v supply chip has gone south.
I know this is a pretty inexpensive unit but didn't think this would happen.
I did notice that on the back of the unit the ground for the antenna is right next to the positive of the backup battery. Perhaps they came in contact with each other and took out the power chip.
In any case I ordered a new one and will place a piece of tape around the unit to prevent any unnecessary contact from happening.