At the time of turn con picture and audio are normal and aprox 15 secs later backligths do not ligth con so no picture. I checked voltages at the psu/inverter and all seems to be ok.ckd the inverter transformer no discrepancias notes and resoldering some suspictious points but the problemas continúes.could be any of the lamps and could you tell me the steps to reach them.
Rgds

Mloo1955