My daughter's Kindle Fire HD6 has suddenly stopped charging. As long as the tablet is plugged in, it will power on and is fully functional. However, the battery indicator at the upper right corner never shows the charging "lightening bolt" and the battery percentage will never go past 1%. When you unplug the tablet, the battery quickly drops to 0% and the tablet shuts down.

I opened the back cover and took a look at the charging port, including the soldering to the motherboard, which all looks fine as far as I can see.

I've tried resetting by holding down the power button and that had no effect.

So what's the most logical problem - bad battery? Bad charging port? I'm lost.

Thanks for any help!