Connect with us

HDTV has no sound

Discussion in 'Electronic Repair' started by [email protected], Mar 22, 2011.

Scroll to continue with content
  1. Guest

    Actually very faint sound at max vol w earphone but effectively silent.

    It can't be the speakers because it does the same with two
    different"speakers".

    AM I right to think it is a capacitor in the amp circuit? The reason I doubt
    is it does not respond to hitting/shaking. THe other thing is the faint
    sound at high volume doesn't match past experience with amp capacitor
    burnout.

    THe unit is a Supersonic 7" 193a HDTV with a 12v power adaptor.

    PS, is there any "electronics repair rules of thumb" cheat sheet anywhere?

    - = -
    Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
    http://www.panix.com/~vjp2/vasos.htm
    ---{Nothing herein constitutes advice. Everything fully disclaimed.}---
    [Homeland Security means private firearms not lazy obstructive guards]
    [Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]
     
  2. Meat Plow

    Meat Plow Guest

    Getting you to the proper documentation would depend on your current
    understanding of electronics.
     
  3. Sylvia Else

    Sylvia Else Guest

    Presumably it's stereo, in which case the loss of both audio channels
    suggests something that's common to both. Power immediately comes to mind.

    Sylvia.
     
  4. Guest

    Decades ago, I had two stereo receivers/amps that my EE uncle tried to fix by
    tapping every capacitor until he gave up. I also had a sim problem once with
    a computer that went blank in RS232 tty output but I fixed it only when the
    manufacturer told me exactly which capacitor to replace (in a twist, the only
    way I could actually get a single such capacitor was to request an
    "engineering sample"). I am a Ch E with two mandatory semesters of EE and two
    introverted EE uncles who never really explained what they were doing while I
    was growing up. So I probably know more than I have confidence in. I am
    looking at this $80 TV that has worked for about 18 months and am trying to
    figure if it is worth fixing. I suspect if I throw it out, my uncle will pull
    out of the trash and put it in his shop but never quite fix it anyway.

    - = -
    Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
    http://www.panix.com/~vjp2/vasos.htm
    ---{Nothing herein constitutes advice. Everything fully disclaimed.}---
    [Homeland Security means private firearms not lazy obstructive guards]
    [Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]
     
  5. Cheryl

    Cheryl Guest

    It sounds like you need to go to the menu and turn your speakers to "On."
     
  6. Guest

    *+-> It sounds like you need to go to the menu and turn your speakers to "On."

    *+-I agree.

    Nope. Turned them (mute) on and off. Only when I turn them to max do I have a
    faint sound on the headsets, but not (yes, I remved the headset) the speakers.

    SOmething burned out. But before I open it to hunt, what is the likeliest?

    - = -
    Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
    http://www.panix.com/~vjp2/vasos.htm
    ---{Nothing herein constitutes advice. Everything fully disclaimed.}---
    [Homeland Security means private firearms not lazy obstructive guards]
    [Urb sprawl confounds terror] [Phooey on GUI: Windows for subprime Bimbos]
     
  7. This unit is no doubt heavily integrated. The probability of finding and
    replacing the correct component is small.

    It's possible that both the headphones and speakers are driven by the same
    chip. It might be the problem.
     
  8. Sylvia Else

    Sylvia Else Guest

    If the ground's become disconnected, the sound through the headphones
    would be the difference between the left and right channels. That
    removes only sounds in the middle of the sound image. The result is
    somewhat odd, but doesn't sound as if there is almost no audio.

    Sylvia.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-