Product review (5 stars): looks like rectifier or diode is damaged from heat
Lightning surge made our Afinity Frigidaire dryer start acting screwy.  Sometimes it wouldn't heat, or would just turn on when you closed the door, and wouldn't turn off even when you pushed cancel button.  Couldn't diagnostic mode to work, so replaced the board.  We bought this in 2012, and this is the first time we have had any problems with it.  Examined the board, looks like rectifier or diode is damaged from heat, not sure which they are without schematics.  Replacement was easy to do, replaced it in 15 minutes, fired right up, works great.