I don't know if I have a lemon or what but its been well documented how the stock USB cable is worthless and eventually won't charge our TP's. So I go and buy heavy duty USB cable from Amazon which worked for a month or two, now it won't charge again.
First I could get it to work my manipulating the cable just right but now even that won't work. I don't know if its a cable problem or if the connector on the TP is to blame (micro USB male end seems to have too much play when connected).
So even though I have android 2.3 installed on my TP, I can't wait to sell this junk and save for the Asus nexus. End rant
Take a look at the wallcharger unit. My TP didn't charge, I did a Google search and found info on fixing the wallcharger. The unit is basically two pieces. You have to twist the part with the USB input. Make sure its in place. I just did this and its charging as I type this. Hope this helps.