VIZIO VX42LHDTV10A...no sound

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  • geronimoejoe
    New Member
    • Aug 2013
    • 5
    • United States
    #1

    VIZIO VX42LHDTV10A...no sound

    I have replaced the output ic (U31) but I still have nothing. All else works fine. I have tried to trace down the audio path, but the print is really a joke. I have Vcc on the 2 inputs from an outline of the IC (TDA8946AJ). I have nothing on the scope at the L/R inputs, but I can touch the inputs using the old wet-finger method, and I get a hum, so it seems that the IC is working. .....one thought, though; there is a regulator Q27 that reads:
    I=11.58V
    o=12.2V
    Adj.=12.2V
    I need to work on my crossing/ subbing skills, but I can't find this part number anywhere on the net. The number on this reg. is C5886. If anyone could help, it would be appreciated. I just can't seem to get anywhere with this one. I know the voltages on this regulator are not right, but I don't know how to proceed with the toilet-paper schematics from Vizio.
    Also, I know some of these used a separate power supply for the audio, but this one doesn't have a stand-alone smps unless someone b4 me has really got me and good!

    TIA

    Joe's TV & APPL.
    7333 US HWY 190W
    Newton, TX 75966
    (409) 384-3325 home & shop
    (409) 489-5001 cell
    geronimoejoe@gmail.com
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: VIZIO VX42LHDTV10A...no sound

      Do you get Audio output at the Red and White RCA jacks? Can we also see the pictures of your main board and the Q27?
      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

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