There's no such command that can be run using SD card txt and Ldr.bin. You may be able to force a general hard-reset by downgrading the firmware to a lower version using an RGN file in preboot if you are able to attain that. In any case it may not be a reset that's required, the symptoms sound more like a hardware problem e.g. a faulty screen digitizer or an incomplete connection when the LCD ribbon was reattached to the board.