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Although yours is a wide screen device, as the GPS devices getting smaller the sound is getting crappier. Larger units of the old days like C330 had much better sound than the smaller Nuvi series because they had more resonant cavity for the speaker which increases acoustical efficiency of the speaker...
Some TomTom one speakers are known to have faults develop. Usually the speaker goes ipen circuit resulting in no sound at all. other can simply go distorted. It might be that your speaker has gone faulty. ( some scrap laptops might yield a suitable replacement speaker as they often will fit )
Another fault common on TomTom one ( early version ) is the extension speaker socket on the base of the TomTom becomes dirty or it can be stressed if you have ever had need to use the socket. The socket also acts as a switch to turn the internal speaker off when the socket is uses. It is very easy to end up with a bent contact on this socket so that even when any plug is removed the switch contact on the socket remains open. This results in sound being cut-off to the internal speaker or the sound might become low or distorted.
I would recommend you check out both these possibilities . Please let me know via this forum how you get on.
I have had the same problem. I bought my gps used.I soon found out sound would not come out of the gps untill I taped on the back of the gps. I solved my problem. The voice coil in the speaker becomes detached. Their are 4 screws in the back of the gps once you open up the gps the speaker is attached to the back of the inside of the gps. You have to carefully detach the speaker from the back of the gps ( I used a small flat head screw driver like one from a eye glass repair kit ) then press lightly on the center of the speaker wile the gps is trying to talk (hopefully when you do this the speaker will make noise). I stacked 2 dimes in the center of the housing of the speaker then reatached the speaker to the housing thus sandwitching the 2 dimes between the housing and the center of the speaker. For my unit this put enough pressure on the center of the speaker for the system to work. Then I reassembled the gps. It was about 4 or 5 months ago and the speaker still works fine. Some times the easy solution works just fine.
Some TomToms ( especialy early ones ) are reported to have faulty speakers. Its most likely this is the fault on yours. Another problem particular to TomTom one is the external speaker jack on the base of the TomTom. Thsi jack socket also acts as a switch to turn off the internal speaker when and external one is used. When a plug is inserted it opens 2 contacts and they colse again after any plug is removed. If these contacts have remained open or been bent or become dirty this will cause no sound out of the internal speaker. However , there are routes the TomTom circuit uses to get sound to the speaker. One is direct ...... This is how you hear the TomTom Drums sound ...and the other is for 'most' other sounds , via the external speaker jack.
This gives us a possible check on any report of faulty sound as follows.
If you hear the TomTom drums OK , then this proves the speaker is OK too. BUT , if you hear no further sounds after the TomTom drums then it will be almost certainly be the speaker jack socket thats at fault.
I fixed my wife's with a speaker from Digikey, part number 102-1564-NE (2 watt speaker, 8 ohms). If you have the guts to take it apart, then it's not too tough. I used a 0.020" thick plastic card (a credit card is 0.030 and is a little to thick) to separate the cover, a very small torx and phillips screw driver, and a soldering iron.
Your problem can be one of several. 1/ you have lost / deleted / corrupted the voices on your SD card. if there are no voices then you won't get any nav instructions. 2/ Your speaker has stopped working , if faulty it will need replacement. ( not unknown and common on early tomtoms ) . On other tomtom models that have an external speaker socket the socket becomes faulty. This socket has a switch that switches the internal speaker OFF when an external speaker is plugged in. If this switch is stuck OPEN then that connection to the internal speaker is lost. However , the Tomtom drums sound is connected to the speaker via a different route so doesnt get switched off by this socket switch so the drums can still be heard.