I opened up this LED bulb that I got and burnt out a few days ago. I cracked it open and tested the individual LEDs and they work, except one which had a noticeable black spot in it. So I tried to desolder it, which didnt go so well but I managed. I figured if I put a blob of solder over the 2 plates, the electricity would flow and Id get the others to light up.
Alas that did not work. Here is what it looks like now. Each individual led works.