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.

Franklin Thomas

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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


Posted on Dec 09, 2008

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So that means the TV sets amp is working. You will need to double check the mute and the sound setup menu. Also try a DVD on another input. If the other input works, you have a problem in the audio switcher circuit, or the sound detector in the sound IF circuit. Good Luck

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Welcome to FixYa!

To add an exterior speaker to Sony KV-13M10, you have to have an AMPLIFIER.
  • At the back of your TV you will be able to see 3 RCA output namely = VHF/UHF, Audio and Video.
  • Use an RCA cable and connect to the Audio output.
  • 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).
  • Your speaker should be connected to your amplifier labeled output or audio out. The connection type depends on the make and model of your amplifier. The speaker wires usually come in red and black color. red goes to red, black goes to white.

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

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.


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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There might be another solution beside the trash can. You see often with audio problem the fault is the audio output i.c that is gone. Also in the tv menu you may have speaker on/off, make sure they are on. If it still doesn`t work then you may want to try the audio out connectors at the back of the set,there may be sound there. What you`ll need is and audio system with aux/cd/tape input and a rca/phono stereo cable. Just connect the tv out to any free input and turn up the volume .
By the way the tv audio out may be variable(option in the audio menu) which means that any amplified speakers(computer speakers) could be used as long as you have rca connectors on the end of it.
Hope this will help. Good luck

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The tech will use the process of board swapping to service the set, and then do the adjustments as necessary to make sure the new boards match up.

Yes... DLP sets are fairly expensive to service!

This is my personal opinion. If the set is out of warranty, I would change for a Plasma or LCD set. If you compare the performance of these to ther DLP, the difference is very big. From what I am seeing from a service point of view, the DLP's are lower in reliability.

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