Hi,
Just repaired a LE40A436TDXXU the set would switch on and bleep then turn off and would continually do this, at first thought it was the lamps as they would flash on then off, i removed the T- CON board from circuit and the CCFL's came on
fortunately i had a T-CON board so tried it and set is now ok!
Will look at board to see if it is repairable??
Robbie