I haven't had any problems with my Optimus II 17.3" for over a year now, however recently I have noticed that the AC cable gets extremely hot and I can smell it burning slightly when I take it out of the laptop.
The problem is with the end of the cable going in the laptop itself. The metal conductor (Sorry, don't know the correct terms) gets extremely hot that you cant even touch it.
When the laptop is on idle, the cable is fine. It only happens when I am playing SOME games. Doesn't happen on all games. For example, the cable gets extremely hot when playing Shift 2, but doesn't get hot when playing Just Cause 2. Another thing I've noticed is that if I have the laptop on my knees, the cable doesn't get hot (Only warm) and it doesn't matter what game I play.
If I play a game for 2 hours or so and then stop, the cable probably melts the plastic and I cannot take it out until I shut down the laptop and let it cool down! The adaptor block only gets warm and never gets hot as its warned on the sticker. CPU and GPU temperatures are fine.
What should I do?
Optimus II: 17.3" Full HD LED Backlit Widescreen (1920x1080)
Intel® Core™i7 Quad Core Mobile Processor i7-2630QM
4GB SAMSUNG 1333MHz SODIMM DDR3 MEMORY
nVIDIA® GeForce® GT 555M - 2GB DDR3 Video RAM
500GB WD SCORPIO BLACK
Optimus Series 6 Cell Lithium-ION Battery - 48.85WH
UK Power Lead & 120W Adaptor