After almost 3 years flawless service, my Macbook Pro Core Duo 15' can not boot any more.

No matter attach battery or not, after I turn it on, the sleep light is on, but there's no chime, and clearly no further boot up, the MBP does not pass its inital hardware test.

I've checked ram and HD, they are in good status.

It all began 2 weeks ago. Firstly, more and more frequent Kernel Panic (especially when work on battery or swith Wifi connections); and then, it has boot-up problem, it was getting worse about 1 week ago, I can barely (1 out of 20) boot it to Target Disk Mode/ or AHT (but passed).

I've done a little bit research and think the long lasting over-heating problem of 1st gen MBP might have burnt my logic board/left io board down, before I make a further purchase here, I want to make sure which one is malfunction (or both of them...? ....)

Here're the pictures I shot after the 1 hour teardown of my MBP, the suspect point on the logic board seems burnt to me... although I didn't smell anything...

logic board 1

logic board 2

logic board 3

left I/O board magsafe

Hope the experts here can help me... thanks!