Magnavox 15mf605t/17

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  • Ritalin
    Senior Member
    • Sep 2010
    • 194
    #1

    Magnavox 15mf605t/17

    Picked this little guy up for free and thought it would be an easy fix since I saw buldged caps on the inverter board and power supply. But replaced them and nothing. I turn the power on and I see nothing, not even anything dim w/ shining a flash light through and no sound. So I'm guessing there's something up with the power supply. There was one bulged cap that was kind of out in the middle of no where on the power supply which I thought was weird.

    Thoughts?

    EDIT: Just replaced the caps circled in red and the 2 on the inverter board.
    Attached Files
    Last edited by Ritalin; 02-27-2011, 07:47 PM.
    Tags: None
    • PlainBill
      Badcaps Legend
      • Feb 2009
      • 7034
      • USA
      #2
      Re: Magnavox 15mf605t/17

      Originally posted by Ritalin
      Picked this little guy up for free and thought it would be an easy fix since I saw buldged caps on the inverter board and power supply. But replaced them and nothing. I turn the power on and I see nothing, not even anything dim w/ shining a flash light through and no sound. So I'm guessing there's something up with the power supply. There was one bulged cap that was kind of out in the middle of no where on the power supply which I thought was weird.

      Thoughts?

      EDIT: Just replaced the caps circled in red and the 2 on the inverter board.
      It appears this uses an external power supply. Are you getting the proper voltage out of it? Have you checked the various voltage regulators to see if they are working?

      PlainBill
      For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

      Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

        Comment

        • Ritalin
          Senior Member
          • Sep 2010
          • 194
          #3
          Re: Magnavox 15mf605t/17

          As far as voltage converters we got...

          (1) - LD1086-33
          (4) - LD33 Y607
          (1) - LD18A

          I'd help find the datasheets, but for some reason I'm not good at finding them
          Attached Files

            Comment

            • Scenic
              o.O
              • Sep 2007
              • 2642
              • Germany
              #4
              Re: Magnavox 15mf605t/17

              http://www.alldatasheet.com/datashee...CS/LD1086.html

              the LD1086-33 should be putting out 3.3V, but it's only 1.328V...
              the LD18A (1.8V) is a little bit low for my liking, but one that may be still ok..

              LD1086-33 -> 3.3V
              LD33 -> 3.3V
              LD18 -> 1.8V

              edit: btw.. the center pin and the tab are the same thing on those..
              Last edited by Scenic; 02-28-2011, 03:24 PM.

                Comment

                • PlainBill
                  Badcaps Legend
                  • Feb 2009
                  • 7034
                  • USA
                  #5
                  Re: Magnavox 15mf605t/17

                  Originally posted by Ritalin
                  As far as voltage converters we got...

                  (1) - LD1086-33
                  (4) - LD33 Y607
                  (1) - LD18A

                  I'd help find the datasheets, but for some reason I'm not good at finding them
                  Wahoo!!! We have a smoking gun!!!

                  That was an interesting way of posting the results. I almost asked 'Why the dickens didn't you post the voltages???'

                  Note that there is a problem at the LD1086-33 at 7007. The input voltage is less than half what is required for good regulation. Also, the LD33 at 7404 has a slightly low output. I'd investigate the LD1086-33.

                  PlainBill
                  For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                  Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                    Comment

                    • Scenic
                      o.O
                      • Sep 2007
                      • 2642
                      • Germany
                      #6
                      Re: Magnavox 15mf605t/17

                      just an idea.. if the LD1086-33 (7007) gets hot, try unplugging the panel cable below. something might be shorted on the panel (T-Con?), overloading the v-reg & dragging down the voltage..

                        Comment

                        • Ritalin
                          Senior Member
                          • Sep 2010
                          • 194
                          #7
                          Re: Magnavox 15mf605t/17

                          Alrighty... I'll trace back from the LD1086-33 and see what I can find.

                            Comment

                            • Ritalin
                              Senior Member
                              • Sep 2010
                              • 194
                              #8
                              Re: Magnavox 15mf605t/17

                              Grobble Grobble Stupid Magnavox soldiering Grobble Grobble

                                Comment

                                • Ritalin
                                  Senior Member
                                  • Sep 2010
                                  • 194
                                  #9
                                  Re: Magnavox 15mf605t/17

                                  Originally posted by PlainBill
                                  Wahoo!!! We have a smoking gun!!!

                                  That was an interesting way of posting the results. I almost asked 'Why the dickens didn't you post the voltages???'

                                  Note that there is a problem at the LD1086-33 at 7007. The input voltage is less than half what is required for good regulation. Also, the LD33 at 7404 has a slightly low output. I'd investigate the LD1086-33.

                                  PlainBill
                                  The LD1086-33 is the baddie! unsolidered the "in-lead" and tested the voltage and it was 4.6 (something close to there) and then when I placed the lead back down, went to 2.63. So just need to order a new one of those hopefully!

                                    Comment

                                    • mbates14
                                      Senior Member
                                      • May 2005
                                      • 169
                                      #10
                                      Re: Magnavox 15mf605t/17

                                      check the resistance on the output of that IC. if its low, itll explain something dragging down the IC. if not, the IC is bad.

                                        Comment

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