Question about Genesis/Mega Drive RGB Bypass mod.

[H6rdc0re]

I recently installed an Arcade TV RGB Bypass mod in my VA0 Mega Drive 1. However the picture is very dark but with the correct colors. I know my RGB cable from Retro Game Cables has 75 ohm resistors as does the RGB board. What would be the best fix? Removing the 75 ohm resistors on the RGB board or do I have to anything else?

http://www.retrorgb.com/genesis1rgbbypass.html

[RGB0b]

I recently installed an Arcade TV RGB Bypass mod in my VA0 Mega Drive 1. However the picture is very dark but with the correct colors. I know my RGB cable from Retro Game Cables has 75 ohm resistors as does the RGB board. What would be the best fix? Removing the 75 ohm resistors on the RGB board or do I have to anything else?

http://www.retrorgb.com/genesis1rgbbypass.html

I'd remove the caps from the ArcadeTV board, both because it's easier then removing them from the cable and it'll keep the Genesis compatible with the 32x; If you leave the resistors on the board and remove them from the cable, then the image the 32x overlays will be too bright...much brighter then the image of the Genesis. I thought I was pretty clear about this in the guide...did I forget to add any of that?

[H6rdc0re]

I recently installed an Arcade TV RGB Bypass mod in my VA0 Mega Drive 1. However the picture is very dark but with the correct colors. I know my RGB cable from Retro Game Cables has 75 ohm resistors as does the RGB board. What would be the best fix? Removing the 75 ohm resistors on the RGB board or do I have to anything else?

http://www.retrorgb.com/genesis1rgbbypass.html

I'd remove the caps from the ArcadeTV board, both because it's easier then removing them from the cable and it'll keep the Genesis compatible with the 32x; If you leave the resistors on the board and remove them from the cable, then the image the 32x overlays will be too bright...much brighter then the image of the Genesis. I thought I was pretty clear about this in the guide...did I forget to add any of that?

Can I break/pull them off the board?

[RGB0b]

All you need is a soldering iron and some tweezers. Please go back and read this page in full: http://www.retrorgb.com/genesisrgbbypass.html

[H6rdc0re]

All you need is a soldering iron and some tweezers. Please go back and read this page in full: http://www.retrorgb.com/genesisrgbbypass.html

In your guide it says bridge the connections. I have no idea what you mean by that. Please note this is my first mod so if I'm asking simple questions I'm still learning.

[RGB0b]

Wow, this is a bit ambitious for your first mod. Try this:

First, CAREFULLY remove the RGB capacitors. Then desolder RGB from the output pads of the amp board (R0, G0, B0) and solder them to the input side of the pads that the caps were attached to:


If you break a pad or trace, you can solder RGB directly to the outputs of the 7314 chip, it's just tricky since the pins are small: http://www.retrorgb.com/images/GenesisB ... emoval.jpg

[H6rdc0re]

Wow, this is a bit ambitious for your first mod. Try this:

First, CAREFULLY remove the RGB capacitors. Then desolder RGB from the output pads of the amp board (R0, G0, B0) and solder them to the input side of the pads that the caps were attached to:


If you break a pad or trace, you can solder RGB directly to the outputs of the 7314 chip, it's just tricky since the pins are small: http://www.retrorgb.com/images/GenesisB ... emoval.jpg

Thanks I try that right away.

[H6rdc0re]

Hmm.. soldering to the pads of the caps still gave me a dark picture. Now soldered directly to the pins of the 7314 chip and still a too dark picture.

Do you have any ideas?

[db-electronics]

What, if anything, is in series with sync in your SCART head? Some SCART cables have 470 ohms in the SCART head, some have 75 ohms, some have nothing - it's a giant mess.

[H6rdc0re]

What, if anything, is in series with sync in your SCART head? Some SCART cables have 470 ohms in the SCART head, some have 75 ohms, some have nothing - it's a giant mess.

I'm using a RGB CSYNC Euroscart cable from Retro gaming cables.co.uk but honestly I have no idea. The weird thing I was getting a dark picture with the 75ohm resistors and caps but also without. Seems weird to me.

[RGB0b]

Yeah, that's strange...I've never run into that issue before with the bypass.

[RGB32E]

What, if anything, is in series with sync in your SCART head? Some SCART cables have 470 ohms in the SCART head, some have 75 ohms, some have nothing - it's a giant mess.

Which is why it's not such a good idea to reuse the Sega 9 MDIN pinout on anything! Is your affinity for Sega the main reason why you choose to use it on your creations, despite the dogs breakfast of cable configurations? Micomsoft's 8 MDIN pinout is a more practical, and is what viletim chose to provide for his applicable kits. Calrad makes pretty sweet 8MDIN plugs.