Vision W screwy headphone issue fix
I recently purchased one of these devices from Ebay. The seller stated that everything worked until the headphones were plugged in then it would proceed to shutdown.
I figured out that if the headphones were plugged in then turned on it would work somewhat. The vocals were weird, the songs would fast-forward and do all sorts of other erratic behavior.
After a little research I figured out it had something to do with the option of adding a wired remote to the headphone jack. I took it apart and discovered that the headphone common terminal was isolated from a common return(ground). I added a small jumper wire from the headphone jack ground to a nearby ground (tantalum capacitor) and it is now working perfectly. That was easy.