Famicom displays garbled picture when powered on, PPU the culprit?

[laserpinhead]

So A long while back I bought a lot of 6 famicoms that were broken for about 50 bucks, I finally decided to finish repairs on them this week, and so far I've gotten one to work perfectly, another works well but it must be set to channel 2 then back to channel one again for some bizarre reason, the third only displays in black and white and I have no idea how to fix it. The other two have bad rf adapters so there is not much I can do with that.

The last famicom is the one I really think I have a shot at fixing (putting my total famicons fixed at three), displays some bizarre messed up picture when powered up. http://i.imgur.com/GBPWgqk.jpg

What does this mean? does it mean that the cables connecting the main board to the rf board are not soldered right? Or does it mean there is a component on the main board that is damaged?
Post Merge: October 15, 2013, 01:00:27 am
And for the record, the sound works flawlessly, further insinuating a bad PPU.

[jpx72]

Looks like bad ram chip to me...

[80sFREAK]

I assume slots are cleaned and reflowed, proper voltage present on all chips.

As for black/white picture "shake" green trimmer around crystal - half turn clockwise, half turn counter clockwise.

[laserpinhead]

The slot component seems to have no cold solder joints, I'd assume I'd get no picture at all if there were any. The voltage seems ok, I see all proper capacitors are in their respective area. What leads me further to believe there is a PPU issue is this. http://i.imgur.com/Jvi8x3d.jpg

It has a metal cover over it, which seems to imply that it was modded or attempted to be repaired. Should I attempt to replace this PPU with a working one?

[P]

I think some PPUs came with heatsinks. It's probably normal.

[jpx72]

Yes that's factory made.

I had many famiclones with problem like yours, it always was either the slot or ram, never ppu.

[80sFREAK]

The slot component seems to have no cold solder joints, I'd assume I'd get no picture at all if there were any. The voltage seems ok, I see all proper capacitors are in their respective area. What leads me further to believe there is a PPU issue is this. http://i.imgur.com/Jvi8x3d.jpg

It has a metal cover over it, which seems to imply that it was modded or attempted to be repaired. Should I attempt to replace this PPU with a working one?

It's early revision. Reflow slot and clean/bend pins