This mod shows you how to modify the Innovation TV-out adapter to output
RGB. Please keep in mind that this adapter only outputs interlaced 480i, not progressive 240p. If you've gone through the trouble of installing this adapter, the RGB mod is
worth doing, but I wanted to warn you in advance what to expect. Before you start this guide, please make
sure your Game Boy Advance is properly working both by itself and with the Innovation TV adapter. If not,
check out the main GBA page for help and more information. If your modded GBA is in
good working order, you can now move along to modifying for RGB!!
- First, disassemble the TV adapter and locate the video
- Then, cut the cables from the existing wiring harness and solder them to the following pins (try to match the
colors, as it will be easier on the other end of the cable). As a note, the “L” & “R” audio channels are
optional, since you can just use the headphone jack on the GBA...more on that in a second:
The sync (S) is actually the composite video out. I’ve seen other diagrams
floating around the internet that say you should hook sync to a different pin, but that never worked for me (I’ve
done a few of these).
Segasonicfan emailed me with a great find though: There seems to be a Sony
CXA chip (or clone) in this unit. You can get csync from the "sync-in" pin circled below. Please note
that this is 5v TTL CSync, so it may not be compatible with some SCART TV's expecting 1v p-p Sync. You can
probably pull RGB directly from that chip as well, but the solder points listed above are a bit easier to
solder to. Click on the picture for a full-sized view:
- Once you’ve soldered the video pins, you can decide if you’d like to pull audio
directly from the board , or separately from the headphone-out of the GBA. If you wanted to pull audio from the
board like I did, you’ll need to add another cable to the stock one, as there won’t be enough for everything.
Also, I decided to remove the connector that was on the board, but it’s probably easier to just leave it in
- I used two thin pieces of cable to add a second audio channel instead of one thick
one, so it would be easier to manage. I just twisted them around the entire length of the cable (as pictured
below) and they seem to stay together fine. Also, the thin cable was able to wrap around the notch in the
cable, so it fit perfectly when the case was bolted back together:
- Cut the other end of the cable at the connection point towards the end:
At this point, you need to solder the wires into a connector. Most
people use SCART for RGB, but you can use anything you'd like. I used a spare Wii SCART cable I had laying
around that only cost $5, but anything will do.
When you solder the cables, you’ll need to add a 75 Ohm resistor to each of the
color cables. Just solder a resistor directly to the R-G-B, pins 15, 11, 7 (respectively) and then solder the
cables to the resistors. Since I used a Wii SCART cable, there were capacitors where the resistors should
be. I de-soldered them and replaced them with the resistors and it worked great. I’m not sure if it
would be better to leave the capacitors on or not, but mine have worked perfectly without them. Here are the
resistors I used:
After that, follow the basic SCART diagram, wiring SYNC to pin 20 and L/R audio to
pins 6 and 2 (respectively). Also, the Wii SCART cable I used already had ground soldered to all the
necessary pins, so I just connected ground to one of them. If you’re building the connector from scratch,
you’ll probably need to make little jumpers like in this picture:
One last thing: The Wii SCART cable had a wire with a 75 ohm resistor
connecting pins 8 and 16. If you use a SCART cable that already has it in there, just leave it in. If
not, you'll only need it if you're using a PAL TV; RGB monitors and upscalers shouldn't need this at all. If
I'm wrong, please let me know, but I'm 99% sure I'm right...
After that, put the SCART connector back together and give it a try!
So, that’s it. Check out the finished product:
Now that you're done, feel free to go back to the main GBA page. If you'd like info on mods for other systems, head to the Getting RGB From Each System page or check
out the main page for more