I have replaced the LCD screen and the battery on a Ipod touch 4th gen following DIY guides and videos. The soldering was difficult, but seemingly successful.
Afterwards the device works with one exception: While the battery indicator shows the 'bolt' charging symbol when plugged into AC, the battery does not actually charge (battery level not increasing after 12 hours plugged in). I have tried more than one charger and verified that the charger is working with other devices. The charge connector seems ok.
What could be wrong, and what could be done to rectify?