SAMSUNG TV, UE55H6290SS, Need schematics

Hello all! The described TV above shows, when switched on, only the number 48 on the right edge of the screen (cannel 48 ?!) for a few (5?) seconds. Then it switches off and on again within the next second ... This cycle runs endless. The remote control can only manage on/off! Nothing else. When on, I can see, that the whole screen ist active (very soft bue), but no content ... I have measured at the Power Supply board BN44-00711A on a described Jumper for: STBY: 6,4V | ON: 8,5V ... but it should be: STBY: 8V | ON: 13V !!! Can somebody help me in finding schematics - at least for the power supply board BN44-00711A?! Many thanks! Josef