Thank you very much for yo vey reply.The info is really helpful.I replaced the power supply board.now some 8.8. came back,but no clock.After 8 seconds,the 8.8. went away,leaving no more display.I had to disconnet the power to the stove,plug in again to get the 8.8. display back for another 8 seconds.I systematically isolated control boards hoping to find out which one was drawing too much power and overloaded the power supply board.I could not find out.Because the dsplay does not stay long enough,so no fault code was displayed.Does any tech know which other board is damaged by the high voltage?