I tried to fix a cursed Nintendo Famicom. It broke me.

This Famicom is in rough shape, let's try to fix it and A/V mod it!

Part 1: This part
Part 2:    • Brand new motherboard for my original Famicom  

Freebie Famicom Composite Mod:

Change R6 to 220 ohm (along edge of board)
Change R12 to 100 ohm (along edge of board - this changes voltage divider to output a "stronger" video signal)
On RF modulator, remove components to isolate CVBS, there are 2 or 3 components you need to remove, or you can cut traces.
Install 100uf / 16v cap with positive side facing signal source (Famicom motherboard, this blocks the DC)
Connect negative side of cap to RCA jack going to your monitor
Try 102 tantalum cap (1nf) between video and ground at RCA jack to smooth video
If you want to reuse the RF jack for video, you need to isolate it by removing a couple components. Then add a wire to connect it to the 100uf cap above.

Note: video will have jailbars, this is just how the video is on the earliest Famicom boards.

For Audio, you can take the audio right off the feed going to the RF modulator, but you should install something like a 10uf cap, with positive facing the Famicom motherboard to remove DC offset. You should remove components on the RF modulator to isolate the audio going into the RF modulator.

Note: Audio will be buzzy, with interference picked up from the Famicom main board.

-- Links

Schematics all from NESdev and Console5 Wiki:
https://www.nesdev.org/wiki/File:Nesw...
https://wiki.console5.com/wiki/Famicom

SMMC episode where I first showed the Original Famicom and AV Famicom:
   • ZX Spectrum motherlode, broken Famicoms an...  

Adrian's Digital Basement ][ (Second Channel)
   / @adriansdigitalbasement2  

Support the channel on Patreon:
  / adriansdigitalbasement  

My GitHub repository:
https://github.com/misterblack1?tab=r...

--- Instructional videos

My video on chip removal without damage:
   • How to remove chips without damaging the c...  

--- Music

Intro music and other tracks by:
Nathan Divino
@itsnathandivino