Sent in my phone (proximity sensor problem) and my charger (2nd time) for service at 1utama
The service consultant also said that the hissing sound from charger is normal, and need to wait 3 days. But i insisted to change anyway.
Just to share, if anyone has ADC value average 9-10 or more for the Proximitiy sensor, it so troublesome that your screen will not appear during calls if you move away from the sensor and you will get stuck a while if you enter voicemail. However, it wont have any problem if you are in a very bright area.
Also, my screen sometimes will auto blackout (not device auto lock), but im not sure if its caused by the sensor.
Normal ADC readings for note 2 should avg 0-1, and i tested on an S3 Demo set in samsung store, it can go up till 4-5 but its still normal
By the way, the sensor can be tested by entering this code in your dialer *#0*# , there are other functions that can be test as well.
Thanks. Added to post 3.