I had an extra ATC head on which the display was totally dead. I knew it had something to do with dry soldering. Finally got a chance today to take it apart and inspect it with my magnifying glass (lol). Anywho, as suspected I found dry soldering on the voltage regulator and three resistors as seen in the pics, re-soldered the affected components and no more blank display. Though I'd share it with you guys/gals since I seen people complain about dead display on their ATC controls. Here take a look:
*Sorry forgot to take before pic of the resistors*
*Sorry forgot to take before pic of the resistors*




