Why weren't you successful after two logic board replacements? Were they all defective??
I will soon be getting a 4th gen iPod Touch with a cracked screen, and I'd like to fix it myself if I can, but I won't if there's a reasonable chance of permanent damage (this will be my first ever iPod repair). To that end, anyone who would be willing to do it for me, send me a PM and we'll discuss it.
Sorry for the hijack!
c