Samsung f74a-p-c45x-4-troub free download

File name f74a-p-c45x-4-troub.pdf

Troubleshooting 4.Troubleshooting 4-1 CheckpointsbyErrorMode 4-1-1 FirstChecklistforTroubleshooting 1. Check the various cable connections first. - Check to see if there is a burnt or damaged cable. - Check to see if there is a disconnected or loose cable connection. - Check to see if the cables are connected according to the connection diagram. 2. Check the power input to the Main Board. 3. CheckthevoltageinandoutbetweentheSMPSMainBoard,betweentheSMPSX,YMainBoard, and between the Logic Boards. Samsung Electronics 4-1 Troubleshooting 4-1-2 CheckpointsbyErrorMode NoPower - The LEDs on the front panel do not work when connecting the power cord. Symptom - The SMPS relay does not work when connecting the power cord. - The unit appears to be dead. The SMPS relay or the LEDs on the front panel does not work when connecting the power cord if the cables are improperly connected or the Main Board or SMPS is not functioning. Inthiscase,checkthefollowing: Major - Check the internal cable connection. Checklist - Check the fuses. - Check the output voltages of the SMPS. - Replace the Main Board. No Power 1 Yes Check that the AC power cord is Connect the AC power cord connected? Refer to image of No Fig. 4-1. If LED is set up as No beingONwhenPOWER-ON, Replace Fuse (FE801) check the ligt-on in LED? Yes 2 No Is the AC Inlet socket Connect AC Inlet socket connected? Yes Refer to image of Fig. 4-1. A 4-2 Samsung Electronics Troubleshooting A 3 Check the connection between No FuseF801S,forchecking