Sony TA-AX311 Stereo Amp

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  • dprit
    Member
    • Jul 2015
    • 49
    • USA

    #1

    Sony TA-AX311 Stereo Amp

    After replacing Q705 and Q707 because one side didn't work, they both run too hot to touch. Any ideas why?
  • petehall347
    Badcaps Legend
    • Jan 2015
    • 4426
    • United Kingdom

    #2
    Re: Sony TA-AX311 Stereo Amp

    what are the voltages at bce ?
    what did you replace them with ?
    did you test all other transistors ?
    r714 r715 good ?
    Last edited by petehall347; 03-20-2017, 04:03 PM.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Sony TA-AX311 Stereo Amp

      Did you check the Bias curent and the active bias control Q706?
      Service manual:
      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

      • CapLeaker
        Leaking Member
        • Dec 2014
        • 8133
        • Canada

        #4
        Re: Sony TA-AX311 Stereo Amp

        Originally posted by budm
        Did you check the Bias curent and the active bias control Q706?
        Service manual:
        x 2

        Comment

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