If the transmitter stopped working, there can be several causes for this. Usually, an electrical device can be repaired if its main circuits are not harmed. In this matter, it can't be said for sure if your device can or can't be fixed. I strongly suggest that you use Google to find a troubleshooting guide. Using that guide, you can try and fix the device for yourself (in case the device isn't working for external reasons). However, if you can't manage to improve its state, you should take it to a specialized service for further support.