tnusam

hello , 

My sony Xperia sp C5303 have a problem regarding headset detection.

it always shows headset connected,disconnection of headset not sensing.

i tried all stock firmwares 4.1.2 jellybean to 4.3. But same problem showing in all firmwares.

after that i open the backcover and removed the flex cable of headset jack from motherboard.

But no change,headset still remain connected.

is this a motherboard problem?

i did some more researches,

actually headset detected by the resistance change between ground and mic pin.

i measured the voltage at mic pin to ground, its nearly 2.65V.

it sensing the key pressing in headset.Actually this headset button connected parallel to mic pin,when it pressed it mic terminal voltage become zero,and chip sensing this voltage change.

actually the headset pushbutton shorting the mic input to ground. so the mic pin voltage

become zero when key pressed.

headset mic also working, the only problem is it not detecting headset removal.

is it a software problem? or hardware? i am sure its not a jack problem or motherboard connector problem. i checked all ..but no solution.

anyone please help me? i am ready to provide more details if wanted..pls help..    thank you