I've opened up alot of xbox's and xbox 360's and I've repaired quite a few DVD drives, but I never seen this.
This Samsung TS-H943 logic (Ms28) board came out of an unmodded 360. It belongs to a friend and he told me that recently he put a movie in the 360 and it just froze. The 360 still turns on but the drive is dead. After removing the logic board, and noticing what appeared to be melted plastic all over it, I thoroughly checked the inside of the drive but nothing appears to be melted. I even tried replacing the laser with one out of a bricked Hitachi, but it didn't work (I already knew that wasn't it but I had to try!)
Of course, since it's unmodded I don't have the key. I'm assuming it's the board itself that's bad.
If anyone thinks they can extract the key from the eeprom, with a programmer, please let me know. Any recommendations or advise would be appreciated.