Samsung ue50eh5300kxxu dead no st by light.

[bonesy]

Hi folks,anyone had dealings with this model?LED back lit set.Mine has no stand by light,if you disconnect lead from psu to ssb board psu runs up back lights are on,all voltages are present,which leads me to think that the ssb is at fault.I bought another second hand ssb board,but fault still the same.I have a known good psu so substituted that,still the same.I think the ssb I bought,was most likely faulty,but they are in short supply. I've checked for shorts on T-con & little sub on /off switch/remote rx board,nothing obvious. I've applied 5 volts to the on/off pin on power board,which brings on set,but no supply to t-con board 3.3 volt supply to on/off r/c rx board also missing,there are voltages on all the little regulators on the ssb,which look to be about right,3.3 volts 1.7 volts & a couple of others,just wondered if anyone's had this problem.In the past I've always just changed out the ssb & the set has been fixed.I still think my replacement is duff,but felt I needed to ask the question,in case anyone has an answer,Also if there's a circuit diagram of ssb board mines BN41-01812A.Thanks John.