Samsung 40" LED UE40C5800 Flashing Standby Light

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  • safesurfer65
    Senior Member
    • Feb 2014
    • 112
    • Scotland
    #1

    Samsung 40" LED UE40C5800 Flashing Standby Light

    Hi

    I've got a Samsung 40" LED UE40C5800 with a flashing standby light.
    When checking the voltage I accidentally shorted PS_ON and STBY and the backlight came on. The standy voltage is a steady 5v. Is this suggesting a faulty main board ? Any help much appreciated.

    thanks

    Mark
    Tags: None
    • safesurfer65
      Senior Member
      • Feb 2014
      • 112
      • Scotland
      #2
      Re: Samsung 40" LED UE40C5800 Flashing Standby Light

      Photos attached
      Attached Files

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: Samsung 40" LED UE40C5800 Flashing Standby Light

          Try disconncting the cable between main board & power board; does the backlight turn on?
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • safesurfer65
              Senior Member
              • Feb 2014
              • 112
              • Scotland
              #4
              Re: Samsung 40" LED UE40C5800 Flashing Standby Light

              Hi Tom

              No it doesn't.

              Thanks

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: Samsung 40" LED UE40C5800 Flashing Standby Light

                  Hmm, unsure then, could be a power board or main board issue. Try bridging PS_ON to GND, and BL_ON (or similar) to Vcc.
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

                    • safesurfer65
                      Senior Member
                      • Feb 2014
                      • 112
                      • Scotland
                      #6
                      Re: Samsung 40" LED UE40C5800 Flashing Standby Light

                      No joy there. I've found 7 of the pins are grounds when there should only be 4 pins. All the 5.3v pins are grounded and one of the 12v pins grounded. So I'm presuming the PSU if faulty ?

                      Cheers

                      Mark

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: Samsung 40" LED UE40C5800 Flashing Standby Light

                          I'd check diodes for shorts on the PSU.
                          Is that with or without being connected to the main board?
                          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                            • safesurfer65
                              Senior Member
                              • Feb 2014
                              • 112
                              • Scotland
                              #8
                              Re: Samsung 40" LED UE40C5800 Flashing Standby Light

                              That readings was with the Psu disconnected from the main board. I'll check the diodes for shorts.

                              thanks

                                Comment

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