Do you mean the gold patched flex cable above the camera? If so, this is where the prongs for your headphone jack meet to allow functionality. You will see the prongs and headphone jack attached to the top left of the mid-frame bezel when you take it off the phone.
no i mean the one is glued on screen casing under battery ending to digitizer connector
Besides that Touchscreen now
is completelly dead i tried checking all flex cables and all are in position and seem ok and especialy the I/O digitizers flex cable.
Whether the digitizers chip is burned or i dont know .Before at reboots screen worked normally and then i got buggy toucscheen, i tried almosth everything installing other roms or changing the touchpad.cfg back to stock .
and this seemed like a good digitizer no dead spots or whatever just buggy touch
i will try editing the voltage at touchpad.cfg
please someone help........
power button is dead now i lost the button it was standing htere with ! duct tape omfg
worst phone ever even my xperia x8 didnt have so many problems
NEVER again motorola i wish my lumia 920 wasnt stolen....now i have a nokia 112

(7 days battery)
NEVER AGAIN ANDROID