No sound My sound in my Tom Tom has gone, only a very faint click I can hear when I try to test the sound. I tried blowing into the speaker but that doesn't work. Any suggestions?? Please help

Safety interlock relay or safety circuit failure.

Try the following test.

Ignition in RUN position
Engine not running.
No operator in seat.
PTO OFF
Brake ON

Press down and release the seat. You should hear the faint click/click sound of the interlock relay as seat switch opens and closes.

If you hear the interlock relay click, try repeating test with brake OFF. Results should be the same.

Comment below for further assistance.

Refer to manufacturer technician locally. Suggest speaker replacement. Vacuums ruin speakers. !!Danger!! Do not blow or vacuum speakers. The cause is coil displacement possible electronic disconnection.

If the sound is also dead on that channel on a pair of headphones. Then you have probably lost the main power amp for that channel. To be certain. With you headphones on, slide or turn the balance control so you can only hear the faulty channel. With some music playing turn up the volume. If you can hear "faintly" music playing then the pre-amp is OK and the power amp has gone.
The power amp will be located on a heat sink. It will consist of 4 transistors (2 for each channel) or one big device (or two) (an IC). If it is transistors you only need to replace the two for the right channel.

Is the power to the speakers correct? Since these are computer speakers,have you checked that the volume on the computer is turned up all the way? Have you tried the speakers on another computer or portable radio of something?

Do you hear any sound? If it is faint, try stopping and restarting the audio services. (for Windows Vista and 7) Click the Start button and type Run, click on Run. (alt press and hold the Windows key and then type r)
Type services.msc in the window. Then scroll through the list and select and click Stop for all audio services. Then repeat this but click Start for each one. Click Apply and then OK.

If you do not hear any sound, open the device manager and see if there is an exclamation point or an x (usually in a triangle) at the audio device lines. Start > Control Panel > Hardware and Sound. Right click on the line and choose Properties and try updating the driver. Check Windows Update and HP Update for any available driver.

I hope this helps.

Cindy Wells
(if these don't work, the wire from the motherboard to the speakers may be damaged/disconnected in the laptop case.)

Try it in another pc, you will see (or more precisely not hear) the most likely fact that the headphone's cable has quit. Buy a new pair.

Most speakers are mains powered (either plugged directly into a wall socket, or maybe using a 12volt adaptor), and inside the speakers will use a small amplifier circuit. These circuits are prone to often going faulty and may lose one speaker or both, so instead the speaker will then only play the sound as it gets it from the PC (or hifi etc.).

Audio to speakers is not sent in a 'loud' form, but is instead just a very high quality weak signal that must be amplified to be heard. Typically a PC sound output may be just .5 to 1.5 volts only, just enough to work a set of headphones but nothing much more.

I suggest checking your speakers on another item, such as a CD player or hifi that definatly works, and if its the same, its most likely the 'amp' gone faulty. It's not really worth fixing as they usually only break in cheaper types of speakers - so its as easy to just buy another set.

If they work OK on other devices, maybe check these things:

Is the volume up on the computer ? Check on the volume icon on the taskbar, and also if its a laptop check its not got a volume dial that has been accidentaly turned down/off.

Test the computer with other speakers, to just narrow down the fault.

Some PC's have several output sockets at the rear (or front), so make sure you have it plugged in to the correct socket - even if you have used it before, some PC's software can actually change what comes from each socket, so your MIC socket could now have become your SPEAKER socket, or other settings may have been changed by other software.

Check your operating system is not using a 4 speaker setup instead, and sending the sound to non-existent rear speakers/woofers/tweaters. My own PC has 8 outputs, so I make sure nothing alters my settings or i'd never hear it again ;)

Its also possible for the PC audio chip to go faulty, but that is very very rare. If nothing else works & the speakers are known working ones, you may have to try a new sound card.

Remember that plugging the standard 3.5mm stereo jack plug into the wrong sound card socket will not cause harm, you may just hear a loud 'THUMP' or click as the power goes across.

One last thing is, try reinstalling your audio drivers. PC operating systems can lose driver functions and do any possible thing you can imagine. It may be as simple as a reinstall to wake up the audio card again.

Good luck.

try to check the circuit board with an expert

i think it would probably be somthing inside the channel???

You may not be using an active input to test. Try attaching an fm antenna and using the tuner. Sone inputs are set to digial and will not make sound with the analog input. The input selector does turn it on. Saves a step.