HDTV has no sound

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]
 
On Tue, 22 Mar 2011 00:07:02 +0000, vjp2.at wrote:

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?
Click to expand...
Getting you to the proper documentation would depend on your current
understanding of electronics.



--
Live Fast Die Young, Leave A Pretty Corpse
 
On 22/03/2011 11:07 AM, vjp2.at@at.BioStrategist.dot.dot.com wrote:
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.
Click to expand...
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.
 
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]
 
vjp2.at@at.BioStrategist.dot.dot.com wrote:
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]
Click to expand...
It sounds like you need to go to the menu and turn your speakers to "On."
 
On Mar 26, 4:37 pm, Cheryl <chuckkl...@yahoo.com> wrote:

It sounds like you need to go to the menu and turn your speakers to "On."
Click to expand...
I agree.
 
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.
 
*+-> 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]
 
On Thursday, March 24, 2011 1:12:50 PM UTC-7, vjp...@at.BioStrategist.dot.dot.com wrote:
. I am
looking at this $80 TV that has worked for about 18 months and am trying to
figure if it is worth fixing.
Click to expand...
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.
 
On Mar 23, 12:58 am, Sylvia Else <syl...@not.here.invalid> wrote:
On 22/03/2011 11:07 AM, vjp2...@at.BioStrategist.dot.dot.com wrote:

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.
Click to expand...
That's perhaps the first trouble shooting 'rule of thumb', check the
power.

George H.
 
On Mar 27, 6:13 pm, vjp2...@at.BioStrategist.dot.dot.com wrote:
*+-> 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?
Click to expand...
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.
 
On 9/04/2011 6:52 AM, spamtrap1888 wrote:
On Mar 27, 6:13 pm, vjp2...@at.BioStrategist.dot.dot.com wrote:
*+-> 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.
Click to expand...
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.
 
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