I'll admit, I had to leave work early. I wasn't feeling it. My YouTube feed had mostly rage bait videos, standard doom and gloom about what's going on in the world, etc. Both my dogs decided they didn't want to listen to me. My coffee wasn't strong enough... Stomach issues...
I just needed to leave and just use the rest of my time to fully decompress. I was gonna dive straight into working on the Famicom, hut I just didn't have the motivation to work on it right away. I just tried to relax, blocked the YouTube channels that keep popping in on my feed that just rage baits people, political crap, et al. I just want video game, automotive stuff, and cooking channels, and drank some water.
After having dinner and walking the dogs, I went to my office to work on the Famicom.
This is where I left it the night before. The Lava RGB was fully installed into the Famicom mainboard. As I thought the PPU was sticking up a little higher than I'd like, I did a quick test fit into the case. Unfortunately, it did stick up a bit, so some trimming needed to be done inside the case itself.
All that needed to be modified inside the case was this little rib. It was part of the guide for the cartridge eject mechanism. I just took some of the plastic off using flush cutters and needle nose pliers. After removing the plastic, I did a quick test fit. Glad to say that it now sits just right in the case.
As I did with the NES install, I cut the wires off of the connector that is supplied and soldered them directly to the Lava RGB board. I soldered the wires facing away from the cartridge slot thinking that it would interfere when I close the case. I bundled the wires together using heat shrink tubing, having composite and S-Video wires in one bundle, RGBS in another, and the rest for the controllers for color palette changing and in-game reset.
Some wiring done on the power/AV board. The power switch and wiring for 5V and ground get wired up for connections to the Famicom's mainboard. I left some length on the power and ground wires since I didn't know how long I needed the wires to be.
I estimated how much length I'd need to connect the power/AV board to the Famicom's mainboard. I soldered the 5V and ground wires to where the original power/AV board connected to the mainboard. The instructions say to solder ground to the second hole from the left(looking at the underside of the mainboard), and 5V on the 5th and 6th hole. As marked on the power/AV board, pins 45 and 46 of the cartridge connector needs to be connected to the power/AV board. There's an Aux connection on that board than needs to be connected to the Famicom's mainboard. There's a solder point near the player 1 controller connector that the Aux point needs to connected to.

Before soldering the wires from the Lava RGB board to the power/AV board, I wanted to check the best way to route the wires. One of the routes I was thinking was to route the wires through the channels where the cartridge eject mechanism was, but the bottom part of the case would have interfered with that. So the quickest solution was to route them just under the mainboard to the power/AV board.
Connections from the Lava RGB to the mainboard for palette switching and in-game reset. I mistakenly cut the wrong wire short as I was getting the controller port pins, so I just swapped them on the Lava RGB board and continued on.
Finally it was time to connect the Lava RGB to the power/AV board. The wires were trimmed down, stripped, tinned, then connected to the proper points.
I reinstalled the mainboard into the top of the case. The controller connectors were plugged back in and the wires routed where they needed to go.I screwed everything down and got ready to test the new installation.
There was one step that I missed. There's a trace that needs to be cut that connects to pin 45 on the cartridge connector. This was part of the instructions that has to do something with getting sound to work.
The DIN connector uses a Sega Saturn style AV connector. I had one of my AV cables that also did S-video that I used for testing.
I didn't take pics of the first test, but with Super Mario Bros., I was getting continuous graphical glitches. I tried cleaning the cartridge up, blowing the cartridge and the connector out, and resetting. Nothing worked. I also tried another Famicom game, but I got the same result.
I took the mainboard out and checked the PPU to see if I missed something. All the connections look fine, but I noticed some residue on one of the pins. I took a cotton swab with some alcohol and cleaned all around the PPU pins. I reinstalled the mainboard and did another test.
Finally got it working! Top pic is of a composite connection, the bottom is S-video.
The hole for the DIN connector was too small for the connector on my cables to connect properly. I used a step drill bit to open the hole a bit.
Completed! Other than a slight buzzing noise, sound and everything works fine. I'll revisit the buzzing sound later, probably starting with checking the mic slider on the player 2 controller.
And finally yes, RGB does work just fine.
This wasn't much of a trial as I thought it would be, with the exception of the offset board mistake I made the day before. I feel like this OG Famicom is now more "modernized" than what it originally was, even after the AV mods that I've done with in the past. So I think this Famicom can be considered finally done!
...well, maybe...