I change my to stk150 but you know what after i install realize that pin 8 and 9 some how are connected, that is the problem that make the tumb noise so I will return those and get another one to see if I can fix the problem. I did the search and found out that there are some bad ic out there that would not working properly because of the cheap make. Let me know if you have any luck. Check you pins with the meter on diode mode.