So, I just screwed my Famicom motherboard. ( A story )

In my case the faulty trace was for Pin 25 of the PPU, a bit of the PPU's address bus. (http://wiki.nesdev.com/w/index.php/PPU_pin_out_and_signal_description)

This whole venture ended up being a good deal of learning.

I just unsoldered and socketed PPUs on a NES then on my AV famicom. All went flawlessly, Not even a scratch on either mobo.
Took about 10 min per chip.

Compare this to 2 hours + badly battered mobo on my first try... I guess thats the price of learning sometimes
Now im ready to start building the RGB mod on my AV!

Furthermore, this allowed me to troubleshoot the 2 NES in my junk pile. Turns out both had defective PPUs and they were both same revision ( NES-CPU-07) Maybe they had a bad batch at some point?

Since im doing a RGB mod, ill have a spare PPU and will be able to resurrect one of them!

Thanks for the moral and technical support guys, i was pretty depressed back when i wrote that first post

 

so things turned out ok in the end!
don't forget to take lots of pics on the rgb mod, this is highly interesting!