Samsung PL42B450B1XZD Service Manual

Contents

TroubleshootingSamsung Electronics 4-7■■ No Picture (When audio is normal)_42"Symptom - Audio is normal but no picture is displayed on the screen.Major Checklist- This may happen when the Main Board is functioning but the X, Y Main Board, Logic Board, or Y BufferBoards are not.- The output voltage of the Main SMPS.- This may happen when the LVDS cable connecting the Main Board and the Logic Board is disconnected.TroubleshootingProceduresCautionWhen separating and connecting the cables such as CN810, CN809, CN807 of the Main SMPS, CN4701 of theX Main Board, and CN5707 of the Y Main Board, a spark may be generated by the electric charge of the highcapacity capacitor. Therefore, wait some time after disconnecting the power cord from the unit.Check the LED operation of Logic BoardIs it normally operating?Check the output of LVDSIs it normally operating?Check the each output of the SMPSIs it normally operating?Check the each output of the SMPS afterdisconnecting the powercable from SMPS.And replace X-main, Y-main Board,Y-scan Board.Replace the Logic BoardReplace the Main BoardReplace the SMPSReplace the Y Scan BoardNoNoNoNoYesYesYesLeandro Palmeira