OK, I have some additional info. I didn't have the components to make the circuit, but there is absolutely nothing on pin 21 of the ppu as far as video signal goes. I also checked the voltage regulator, and I get around 11 volts, 0 (ground) and around 5. So voltage is good, at least there.
I actually watched those youtube videos yesterday before I jumped on here. I am under the impression I have a bad PPU or CPU or both.
I have a spare parts nes that has other issues cosmetically (broken case and bad 72 pin connector), but has good components. Unless you guys have different ideas, my next step will be to try to transplant those into this system. I eventually wanted to do an nesrgb/svideo mod to this system with the snes style multiout, so the plan for now is to order sockets, solder those to the board, and see if the replacement chips fix the unit. I will need to socket the ppu holes anyway to do the rgb mod, so I won't be out a whole lot in the meantime. It may be awhile since I have to order the parts, but I'll keep you guys updated.