Magnavox 42MF237S/37 No Picture/Sound/Menu

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  • nWoJester
    Member
    • Nov 2013
    • 10
    • USA
    #1

    Magnavox 42MF237S/37 No Picture/Sound/Menu

    The plasma originally had the following issue:
    Attempt to power up, 2 clicks, powers off and red led blinked 6 times.

    After replacing the power board, it now powers up with a blue solid led on the front, solid green led on the power board, and 2 solid green led's on the output board. It responds to the remote since the front blue led blinks with every button press. The side panel works that I know of since I can press the power button on it and it powers off/on. There is no sound, picture or even the menu/HUD of the tv displaying.

    I've attempted to use the basic troubleshooting guide pinned to this section for no picture. I disconnected the z board, powered up nothing. I powered off, unplugged, waited 10mins, plugged in the z and disconnected the y, still nothing.
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

      Does this TV have a Samsung plasma panel?
      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

        • nWoJester
          Member
          • Nov 2013
          • 10
          • USA
          #3
          Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

          Yes. So is the y, y buffer, z and power supply boards

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

              See here
              https://www.badcaps.net/forum/showpo...61&postcount=2

              You should get patterns which cycle one after another after doing that test if the main board is the fault.
              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

                • nWoJester
                  Member
                  • Nov 2013
                  • 10
                  • USA
                  #5
                  Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

                  Still the same.

                    Comment

                    • nWoJester
                      Member
                      • Nov 2013
                      • 10
                      • USA
                      #6
                      Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

                      I even unplugged the LVDS cable from the In on the converter board instead of the out, but it turns off after 15 secs instead.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

                          OK, please just to confirm show me how you make the jumper test. Some older Samsung panels are slightly different.
                          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

                            • nWoJester
                              Member
                              • Nov 2013
                              • 10
                              • USA
                              #8
                              Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

                              I unplugged the power. I took off the metal tray hiding the logic board by removing the 4 screws and some misc cables that were to short going to the power board. I disconnected the LVDS cable from the logic board. I placed a HDD jumper on the bottom two pins labeled 3-4. Plugged the misc cables back into the power board. Plugged the power cable back in and everything powered up the same as before with the same no picture, no sound and no menu/HUD of the tv. I can redo it and take a picture if that is what you where asking for really.

                              It doesn't even seem like the plasma is glowing.

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK
                                  #9
                                  Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

                                  OK, we'll assume the self test was done right, next you will need a digital multimeter and you need to test the Vs and Va voltages off the power supply.
                                  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

                                    • nWoJester
                                      Member
                                      • Nov 2013
                                      • 10
                                      • USA
                                      #10
                                      Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

                                      After digging around to figure out the process. I get no readings on the dmm. I set it to 1000v DCV and tested from the connectors on the psu. I'm guessing the psu is bad? I even tried from the test locations. I also tested all 4 fuses and they have 1.2 readings.

                                        Comment

                                        • nWoJester
                                          Member
                                          • Nov 2013
                                          • 10
                                          • USA
                                          #11
                                          Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

                                          I used the SDM feature and the front led blinked 4, 6, 4, 6, 1.

                                            Comment

                                            • tom66
                                              EVs Rule
                                              • Apr 2011
                                              • 32560
                                              • UK
                                              #12
                                              Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

                                              Uh sorry, missed your post completely. Can you repeat the Vs, Va test with the X-main and Y-main boards removed?
                                              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

                                                • nWoJester
                                                  Member
                                                  • Nov 2013
                                                  • 10
                                                  • USA
                                                  #13
                                                  Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

                                                  I've done that and still nothing. I had someone do some testing and the only voltage readings I get come from the black wires going to the input board. Which are 12v and 5v from the respectively marked areas on the connector.

                                                    Comment

                                                    • nWoJester
                                                      Member
                                                      • Nov 2013
                                                      • 10
                                                      • USA
                                                      #14
                                                      Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

                                                      Should the Vs and Va be at the amount on the label with the black cables going to the input board connected or disconnected with the Y and Z boards as well? Should I return the PSU or get a input board?

                                                        Comment

                                                        • FrustratedinTX
                                                          New Member
                                                          • Nov 2013
                                                          • 4
                                                          • USA
                                                          #15
                                                          Re: Magnavox 42MF237S/37 No Picture/Sound/Menu

                                                          Hi.

                                                          New to the forums. I need to make one posting, so I can then start a thread.

                                                          This is the new posting. Sorry for intruding.

                                                          Thank you

                                                            Comment

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