Resposta para "Section of Atrix touchscreen completely unresponsive."On three ATRIX 4G'S the repair has been to resolder the connections from the digitizer on the motherboard. These must be stressed physically and a weak point. At times our products suffer from poor reflux solder flow at the board manufacturing stage and it would be far fetched to think Motorola does not suffer at times the same fate. Poor/weak joints will appear incomplete or NOT shiny but cloudy silver color. This results in a weak solder joint that can be intermittent or a totally open connection. Though I have only repaired 3 Atrix's so far for the touch screen/dead buttons situation, all have been solder problems at the motherboard OR on the digitizer board connection.