skelly jtn dave Posted October 10, 2020 Share Posted October 10, 2020 Can anyone give me advise on when running my Bachmann sound Class 47 the sound just disappeared, I cannot find any reason why this has happened. I have took the body off, all wires appear intact, no signs of failure on the PC's, thanks for any help given. Dave. Link to post Share on other sites More sharing options...
skelly jtn dave Posted October 10, 2020 Author Share Posted October 10, 2020 Thanks Richard, yes eveything else works fine, i will do a factory reset and see what happens but i think the decoder has blown, didnt want to go to the expense of a new decoder but thats what a may have to do. Thanks again for your reply. Dave. Link to post Share on other sites More sharing options...
RMweb Premium Ray H Posted October 10, 2020 RMweb Premium Share Posted October 10, 2020 It really is worth trying a different speaker before you splash out on a replacement decoder. I've had a speaker fail on me so do try that. 1 Link to post Share on other sites More sharing options...
skelly jtn dave Posted October 10, 2020 Author Share Posted October 10, 2020 Thanks for that Ray, i will. Dave. Link to post Share on other sites More sharing options...
Albie the plumber Posted October 11, 2020 Share Posted October 11, 2020 Once had a class 25 that 'lost its voice' Sent it somewhere to try a reblow and lo and behold , it got its voice back . If someone cannot reblow it they will usually only charge you return postage . 1 Link to post Share on other sites More sharing options...
peterfgf Posted October 12, 2020 Share Posted October 12, 2020 I've had two Loksound 3.5 sound decoders fail: the sound disappeared but the chips still functioned as decoders. I returned one to Howes where I had bought it and was told the amplifier had failed and that I would have to buy a new one (it was out of warranty). The other was a Bachmann Deltic with a factory fitted sound decoder, again out of warranty - I need to check the wiring first but might try a "reblowing" service as suggested above. Peterfgf Link to post Share on other sites More sharing options...
RMweb Gold pheaton Posted October 12, 2020 RMweb Gold Share Posted October 12, 2020 (edited) If the amplifier has failed the chip will never produce sound no matter how many reblows you try, the other most likely issue is as Ray H said is a faulty speaker I have had the coil go open circuit on speakers before and produce zero sound.....if you have a multimeter you can easily check for this. you should see 100, 8, or 4 ohms across the speaker terminals (with the decoder disconnected). Edited October 12, 2020 by pheaton 1 Link to post Share on other sites More sharing options...
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