Samsung PL42B450B1XZD Service Manual

Contents

Troubleshooting4-2 Samsung Electronics4-1-2 Checkpoints by Error Mode■■ No Power (42")Symptom- The LEDs on the front panel do not work when connecting the power cord.- The SMPS relay does not work when connecting the power cord.- The units appears to be dead.Major ChecklistThe SMPS relay or the LEDs on the front panel does not work when connecting the power cord if the cablesare improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:- Check the internal cable connection status inside the unit.- Check the fuses of each part.- Check the output voltage of SMPS.- Replace the Main Board.TroubleshootingProceduresIs the AC IN socket connector andthe SMPS CN800S connected?Insert the AC in connector and theSMPS CN800S connectorIs the Fuse (F801S) of the SMPSPower Input Part blown? Replace Fuse (F801S)Replace the SMPSSMPS CN801Pin 3 : STB 5VPin 2 PS-ON : Check to see if it is 0VReplace the Main Board①①②YesNoYesNoNoYesLeandro Palmeira