Sansa Clip + 2GB - display is fading and battery won't charge

Hello,
I have a problem with my Sansa Clip + 2GB. One or two weeks ago display has started fading, but I have SC+ something like 2 years and it survived a lot, so I ignored it.
Unfortunately today battery has stoped charging. I plug it to PC, charging starts, but when SC+ is 100% connected, battery looks like full charged. When I unplug SC+, it don’t want to work. The only repair I made myself is soldering mini-jack connections.
Any suggest what can be a problem?

And you already tried a reset, right?

Have you tried resetting it by pressing and holding the power button for 20-30 secs? Release and then press the power button again momentarily to see if it will start up normally.