This cable connects from the LCD panel to the logic board. Helps keep the refresh rate and FPS in sync and prevents tearing and other screen artifacts.
593-1385 922-9843 V-Sync/LCD Temp Sensor Cable - Mid 2011 - A1312 27 inch iMac NB-2798W This is the V-sync / LCD temperature sensor for the Intel iMac 27-inch released in mid 2011. Apple part number: 922-9843, 593-1385