HDTV has no sound
vjp...@at.biostrategist.dot.dot.com
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]
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Meat Plow
> 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?
Getting you to the proper documentation would depend on your current
understanding of electronics.
--
Live Fast Die Young, Leave A Pretty Corpse
Sylvia Else
> 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.
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.
vjp...@at.biostrategist.dot.dot.com
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.
Cheryl
It sounds like you need to go to the menu and turn your speakers to "On."
Bob Villa
>
> It sounds like you need to go to the menu and turn your speakers to "On."
I agree.
vjp...@at.biostrategist.dot.dot.com
*+-> 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?
William Sommerwerck
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.
whit3rd
> [no sound on HDTV] . I am
> looking at this $80 TV that has worked for about 18 months and am trying to
> figure if it is worth fixing.
If it has stereo sound, one bad capacitor wouldn't take out both channels.
And, if there are audio inputs (like for a DVD input), you can try
an external sound source to see if the amplifiers and speakers are OK.
Firstly, you have to exercise the problem, see what part of the block
diagram the fault is in...
Second, you have to inspect the hardware and determine which components
are in which block. If there's a melted thingummy and you can see the crater
where it lost its smoke, things get easier.
Then, with about twenty minutes of work into the job, you think about 'worth'
issues.
George Herold
That's perhaps the first trouble shooting 'rule of thumb', check the
power.
George H.
spamtrap1888
> *+-> 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?
Did this ever work? If not, why did you not contact the manufacturer
within warranty?
Assuming the typical headphone jack setup where insertion of the
headphone plug disconnects the speakers from the amplifier, my guess
is that there is something wrong with the headphone jack or its
wiring. The faint sound you're getting (in both ears?) from the
headphones sounds to me that instead of being connected to left and
ground and right and ground, it is connected between left and right.
Open it up, look for obvious short circuits or open circuits, check
continuity.
Sylvia Else
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.