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.
Looks like bad ram chip to me...
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.
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?
I think some PPUs came with heatsinks. It's probably normal.
Yes that's factory made.
I had many famiclones with problem like yours, it always was either the slot or ram, never ppu.
Quote from: laserpinhead on October 15, 2013, 01:35:26 pm
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