Three lights above START button are blinking all the time. Please Help

[SIZE=3]I have a Frigidaire Affinity (Model number is LEQ6000ES1) front load dryer. It is about three year old. The three lights above START button are blinking all the time, no lights on Select Knob and dryer won’t start. We try to use “Dryer Tech Data Sheet” to analyze the problem. But we can’t get any result. Electronic Interface Board (99.00) and Control Board (155.00) are so expensive. We don’t know if it is the problem or not. Please Help. Thanks.[/SIZE]