I was use isd1700 to record voice. It can work normally. But today, I use the power supply to 12V, which make it very hot. And when I press the button LED is not flashing anymore, so I removed the old one out and now I put socket 28pin for ISD1700 into circuit . It will make easy to change new IC . And when I put new ISD1700 the LED is not flashing anymore, I check Resistor and Capacitor all circuit in the data sheet on page 16, Every Resistor and Capacitor OK. After that I check power 5V on PCB .The power was normal but when I press the button, LED is not flashing and have no sound. So I don't know how to repair it. please help me.