Yeah, so I guess that it must have been already toast and the recapping really didn't actually killed it. The hottest part isn't really this IC, but two SMD resistors right next to it (marked with 240) and also a nearby VRM.

Does anyone know what this Sebastian IC does? It is actually labeled a Bt9845AKPF chip.

EDIT: Found it: http://support.apple.com/kb/TA29779?viewlocale=en_US

Sebastian

Sebastian - A video color palette and video digital-to-analog converter (DAC). It accepts up to 64 bits of digital input, either as one 64-bit port or as two 32-bit ports. Lets one 32-bit port handle digital video while the other processes graphics using the same or different color lookup tables. Supports mixing video with still graphics, uses a convolution filter to minimize flicker in line-interlaced displays, and supports displays with clock speeds up to 100 MHz.

So it must be something else also wrong...

EDIT 2: Even more data on AV subsystem http://www.filibeto.org/unix/macos/lib/dev/documentation/Hardware/Developer_Notes/Peripherals/Macintosh_DAV_Interface.pdf