Marantz ST-4000

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  • vagos_89
    Senior Member
    • Apr 2014
    • 61
    • Greece
    #1

    Marantz ST-4000

    Hello all and sorry for my english. I would like a little help with my Marantz ST-4000 tuner. The tuner waw working normally and suddenly went off. When it is pluged the standby led is on as always but if i try to turn the tuner up the monitor doesn't show anything. I have not sound on speakers too. I opened and tested four transistors on power supply, all diodes and zeners and are all ok. I tested and resistors too and nothing goes wrong. I dont replaced electrolytic capacitors because they seemed good but i dont measured them for ESR and capacitance. In the power supply out connector i have 6 pins and i have those voltages:
    POWER: 3,75V
    GND: -
    remote control: -
    FL2: -25,9v
    Vfip: -32V
    FL1: -25,8V

    Are those voltages ok or is there pissible to have bad power supply? Any idea what to ckeck? Thanks in advance!
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    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Marantz ST-4000

      Those Voltages you show are for the Fluorescent display.
      How about the the Regulated 12V Voltages? You have two of them per service manual 3. BLOCK DIAGRAM.
      See page 5 and 6 for the actual circuits.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • vagos_89
          Senior Member
          • Apr 2014
          • 61
          • Greece
          #3
          Re: Marantz ST-4000

          thank you for you reply! yes i tested these 12V voltages and was ok. I found the problem. I decide to test the power push button after all measurements, and YES i had faulty power push button. Than you for you interest again!

            Comment

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