This solution may possibly help fix Nokia 6720c that shows on local mode or test mode on the LCD screen display. If this happens refer to the solution below for it shows which particular components needs to be check and or replace for possible damaged.
Nokia local mode/ test mode problem solution
You may just try to remove or replace the ESD protection diode and the filter capacitor shown on the solution above. These components is connected to the BSI (battery stats) of the device circuit.
