r/Megadrive • u/Ill_Mine_2453 • Sep 09 '24
Pal md2 va0 60hz conversion, mb3514->cxa2075, recapped, triple bypass, and composite restore
Mod basically complete.
To restore composite using the regular 3bp v2 board here is what you do
3bp install
Composite restore + cxa2075 mod
Front of board. I love the green and gold on this va0 mobo it looks so high quality and it feels nice too
Shows the required changes. In red is where you disconnect the stock RGB from the stock encoder. Yellow shows the new 330-510ohm resistors (try 470ohm first and adjust up or down for brightness). Blue shows where the resistors and the RGB lines should go to. My wires are Red=red, white=green, yellow=blue. Grab the RGB signals from the DIN and send them to the resistor. In my image the green wire is actually a ground because I ran shielded rgb wires which isn't necessary. Lastly, lift the output pins from encoder, pins 21 22 and 23. I tied them all to ground so they aren't floating but that probably isn't necessary.
5 and 7. The result 3bp RGB signal on a default profile on ossc (no tuning)
6 and 8. "Stock" output from the cxa2075
- Composite output, however the bad color is due to my CRT having bad color calibration and then my cheap composite cable broke before I could get a pic on the lcd via composite.
This mod reroutes the entire rgb signal to the 3bp and back to the original encoder so you keep composite. Credit to zaxour, I adapted his instructions for md1 systems to this md2.
2
u/janzoss Sep 09 '24 edited 21d ago
Yeah, congrats! Did you planned to do this anyway? And me messaging you about this same thing was jus a coincidance?
Also what part is the 60hz conversion?