Magnavox 42mf230a/37

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  • 84TAVeRT
    New Member
    • Sep 2012
    • 4
    • USA
    #1

    Magnavox 42mf230a/37

    it just stopped working last week...

    no picture no sound

    led is red, push power button on remote or tv and led turns blue... have to unplug to turn off

    checked the y-sus and buffers for short both passed as non-short

    found a bulging cap on the y-sus and replaced it (no change)

    started checking voltages today...

    1. Check PowerSTB5V（U516 3PIN）
    Voltage: 5V (shows 4.95v)

    2. Check the REL-SW state of power IO
    interface，
    High Voltage：Turn on
    Low Voltage：Standby
    Test Point： C pole of Q5
    High Voltage：5V（4.2---5.3V）
    Low Voltage：0V

    I get 0 volts, so i am not coming out of standby

    what should i check next, this is my first plasma project...

    thanks,
    chris
    Last edited by 84TAVeRT; 01-24-2013, 09:02 PM.
    Tags: None
    • 84TAVeRT
      New Member
      • Sep 2012
      • 4
      • USA
      #2
      Re: Magnavox 42mf230a/37

      found another bulging cap on the main power supply

      also discovered fuse f5004 is blown on the y-sus

        Comment

        • 84TAVeRT
          New Member
          • Sep 2012
          • 4
          • USA
          #3
          Re: Magnavox 42mf230a/37

          components replaced...

          no apparent power on secondary side of main power board...

          what now?

            Comment

            • 84TAVeRT
              New Member
              • Sep 2012
              • 4
              • USA
              #4
              Re: Magnavox 42mf230a/37

              btw, f5004 was not blown...

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: Magnavox 42mf230a/37

                  Can we see some pictures?
                  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

                    • Rhymemeister
                      New Member
                      • Feb 2013
                      • 3
                      • USA
                      #6
                      Re: Magnavox 42mf230a/37

                      Originally posted by 84TAVeRT
                      it just stopped working last week...

                      no picture no sound

                      led is red, push power button on remote or tv and led turns blue... have to unplug to turn off

                      checked the y-sus and buffers for short both passed as non-short

                      found a bulging cap on the y-sus and replaced it (no change)

                      started checking voltages today...

                      1. Check PowerSTB5V（U516 3PIN）
                      Voltage: 5V (shows 4.95v)

                      2. Check the REL-SW state of power IO
                      interface，
                      High Voltage：Turn on
                      Low Voltage：Standby
                      Test Point： C pole of Q5
                      High Voltage：5V（4.2---5.3V）
                      Low Voltage：0V

                      I get 0 volts, so i am not coming out of standby

                      what should i check next, this is my first plasma project...

                      thanks,
                      chris
                      I also have a 42inch Magnavox plasma I picked up for twenty dollars. It looks brand new inside and out but no power.I replaced the power board and another smaller power board but it just does nothing like it isn't even plugged in. There is power to the inlet, I know. All fuses check okay. but no power, no indicator light, nothing, Can anyone help?

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: Magnavox 42mf230a/37

                          Is the model of your TV the same? Regardless, it would be best to create a new thread.
                          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

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