Question about Sony FD Trinitron WEGA KV-32FS120 32" TV

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Audio Pulses Off & On at Random (all speakers) (all inputs)

After much troubleshooting & talking with Sony tech support;
I changed the''M'' board (contains audio system signal processing, system control micro,etc.).
--Same Problem--
Even though all audio outputs of this ''M'' board pulse off & on, as seen on the oscilloscope,(even with the signal paths to the final audio output amps disconnected -- ahead of the muting buffer circuits), I changed the two audio output ICs (in accordance with a suggestion from one of the Sony support engineers).
-Same Problem-
All applicable supply levels seem OK (audio processing and outputs).
Blocking applicable mute lines, without disconnecting the signal lines to the amplifiers, does not solve the problem.
Immediate muting ''buffer'' stages at the audio output ICs are not falsely activating.
Disconnecting audio signals to the audio final amps and properly blocking muting signal activity eliminated the associated popping / pulsing sounds that accompany the associated audio off on problem; however, I would have to go back to the owner's home & recheck to see if I could still hear a ''whisper'' of the faint sound of this pulsing activity.
Problem occurrs when using any audio input, including the tuner.
Thinking that there might be some erroneous interrupting digital system control message on the serial data buss line,I tried disconnecting serial clock & data lines from the tuners and, additionally, also disconnecting the rear A/V connection board (this caused audio drop out except for the pulsing / popp sound, which likely results from the triggering of the muting buffers by the audio processing operation malfunction). Other sections, such as the line doubler digital video processor, could not be disconnected with any practicality.

-Same problem-

Thanks for ''hearing''/ considering my case.

Sincerely,
Franklin Thomas
thomastv@bellsouth.net







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  • Sony Master
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There could be interference with another device, remove all of you other devices especially with an amp or speakers, disconnect these and try the process again

regards

Posted on Dec 09, 2008

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Posted on Jan 02, 2017

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Welcome to FixYa!

To add an exterior speaker to Sony KV-13M10, you have to have an AMPLIFIER.
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  • At the back of your amplifier, connect the other end of the RCA cable to an RCA input labeled Audio - L (left, usually in white color).
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A simple diagram will look like this:

TV audio out -------------> amplifier audio in (left, white color) amplifier audio out (left, white color) -----------> speaker (black wire) amplifier audio out (right, red color) ------------> speaker (red wire)

Thank you for using FixYa.
Have a great day.

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No audio on Sony Wega Tv. Mute is ok. Volume bar goes up and down . No sound at all


Hello, Welcome to Fixya.com

If the mute is ok, you want to check if your have a cable or sat box that the mute on those are ok as well, if so then your looking at a internal issue with the TV that would involve repair.

Try this

1. unplug the tv wait 10-15 seconds then plug it back into the wall outlet.

Also

2. unplug any cable boxes or sat boxes that might be causing the issue.

If you still are having issues you might want to check it into a local repair shop near you, but take this advice for what its worth you might wind up paying more for the repair then the purchase of a nice flat panel.

Make sure if you do take it into a shop that there registered with the BBB and do not have complaints registered as those shops could end you paying more money.

Thanks for making Fixya your first choice, We can Fix most things but have solutions for everything.

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