Travelmate 2480-Only One (Left-sided) Speaker Working

You need to supply more information about the repair you did to this laptop. The replacement of the D/C Jack is a very complicated procedure and requires a complete dis-assembly of the laptop. The problem is that you are going to have to open it up again to resolve the sound problem. Since it is not working in any of the normal functions. You will have to hope you did not damage the motherboard and lost the sound to one channel. If you are lucky and did not damage the motherboard, you will need to find out where the sound is lost in the channel. This is done by tracing the circuit back to the sound device. Along the way you may find cold solder joints. This will be in the form of loose component connections. I hope you have a diagram of the board and can do basic troubleshooting with a digital multimeter. You can carefully trace the circuit and try to repair the bad connection or replace a faulty component in the circuit. If you need help, try to find a place where they teach electronic repair. Go to them for help with the signal tracing and all other needed help. They will have all the proper test equipment and might even help you with the repair.There really is not a lot that can be done without knowing the type of motherboard and seeing circuits diagrams on this end. You will have to find this information either from a repair shop or maybe the repair school. The school will be a lot less costly if they have to help you with the repair. I hope this information will give you some ideas of how to proceed with the troubleshooting and repair of you laptop computer.