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28" Toshiba TV has no audio when TV is turned on. the speakers are fine as you can hear a video tape. need help

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First check that any muting control is not activated. This might be a button on the remote or set itself. If you have a headphone jack, it may have dirty contacts as plugging in a headphone usually mutes the speaker. If the set is mono or only one channel of a stereo set is out, then check for bad connections to the loudspeaker. Test the loudspeaker by disconnecting one of the wires (with the power off!) and measuring its resistance with an ohmmeter (it should be less than 100 ohms - probably less than 8 ohms). Or momentarily touch a 1.5 volt battery to the speaker terminals - you should get a click or pop from the speaker. Next, trace back from the speaker output terminals to the circuit board and look for bad solder connections or a loose or dirty connector. If these tests do not reveal anything, you probably need a scope (or audio signal tracer) and schematic. Or at least the part number off of the chip. Is the final amp a chip also or just a transistor? Have you tested the transistor? If there is little or no buzz from the speaker, that would indicate a problem fairly near the output. If the tuner/if were bad, I would expect some noise/humm pickup from the low level audio stages. Get the part number off of the chip. If it is in a socket, check the contacts for corrosion or looseness.

Posted on Jul 01, 2008

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Check if the speakers are switched on in your Menu:

Press the AUDIO button on the Remote Control or the Menu button on the TV set to display the AUDIO menu. Repeatedly press the AUDIO button on the remote or the ADV button on the TV set until SPEAKERS is displayed in magenta

Press the + or - button to call up the SPEAKERS ON/OFF mode on screen display. Each time you press the button ON or OFF mode alternate. Make sure is is switched to on.

Also there is a switch on the back of the TV to control which speakers you use, it says MAIN SPEAKER EXT-INT make sure this is set to INT.

If this doesn't work you'll have to contact Toshiba service.

Hope that helps..........

Posted on Jul 01, 2008

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The tv works fine, can hear all channels except the video channel on the tv - no sound at all - the video when playing a tape no sound either - please help - thanks


Since the sound works on all other channels, there are 2 possibilities:
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2) The source is not sending the audio to the set.

The higher probability is option 2. Can you please post the make and model of hte set as well as that of the tape player? That info will help to give you more details.
Thanks,
Dan

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