I know this is a very late reply, but I figure if you were still interested I might as well tell you what I know. Just earlier today I fixed up my V3 tamagotchi that I've had for years now. I'm not sure exactly how you'd fix the LCD screen, but for the IR port and sound wire, it should be easy enough. All you need is a soldering tool (woodburning tools work as well). For the sound wire, carefully melt the little blob that is on the motherboard, make sure it doesnt melt into the one next to it, or the sound wont work. This is what happened to mine, but seeing as I barely was able to get the buttons and screen working properly I wasnt picky. If it does happen, you'll just have to carefully re-melt the blobs so they are two seperate entities again. Gently press the sound wire into the blob and blow on it so it hardens and cools quickly. If the wire disconnected on the other end, make sure the blob is somewhere on the metallic part of the circle. The IR port can be fixed the same way, but you might need to buy or find some soldering wire (the kind you melt to get those little blobs), and connect the IR port back to the main tama carefully again.