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Ryu's DreamCast RGB Guide

[Ryu's Schem]


Somewhere in the Netherlands, sometime at 26-1-1999

First and foremost, I take no responsibility for any damage
that might be the result from the procedure described below.
And, yeps, I'm the same Ryu as the one from the N64 RGB mod ;)

Well, well, well.. It seems that yet another next-gen console is
in need for a little internal mod to output the only choice for
hardcore gamers, RGB.
Since good information on this subject is near impossible to
find, let alone a decent guide on how to modify a DC yourself,
I'm spreading this release, hoping to help as many people as

I searched long and hard, browsed various sites and met several
people on irc, until finally, I met someone who provided me a
link to his page. It contained all the information I needed,
based on various sources including a picture made by someone at
If the person who I met on irc is reading this, please mail
me for the credits!

                       -=STEP BY STEP GUIDE=-

Here's a step by step guide; only proceed when you have some soldering
skills. Also make sure you've grounded yourself properly since the
tiniest of electrical charges can damage the console permanently!

Make sure to use a color-coded ribbon cable, or note which wire carries
which signal. Also, after soldering a wire to the mainboard, solder
the other end immediately to the corresponding plug on the scart
to avoid any confusion.

Ok, here goes!

1-  If present, remove the modem from the Dreamcast. Also take out
    any CD that might still be in the console.

2-  Remove the four screws from the bottom corners.

3-  When you have your DC open in front of you, remove all the screws
    holding the various components together. Also carefully pull out
    the ribbon cable and fan power cable from the joypad interface board.
    After that, remove the interface card itself.

4-  Plug out the powerswitch cable and pull of the powerboard from the DC.
    If the two screws that held it in place are removed this should be
    easy. Just be careful not to touch any of the components on the board,
    since they might still contain some electrical charge. Remove the
    plastic that is placed below the powerboard also.

5-  If you've properly negociated step 3, you should also be able to
    pull the CD drive unit from the board. Be sure to pull the metal
    under the black plastic, and not the plastic itself.

6-  Remove the metal shielding from the mainboard.

7-  Now that the mainboard is finally exposed, carefully take it out.
    Let the cooling system in place. If it comes off, no problem; you
    can push it back later! Leave the metal at the very bottom of the
    console casing where it is.

8-  Now, decide what you want to use to connect the DC to the scart plug.
    I used a ribbon cable, 8 wires wide and about two metres long.
    Either drill a hole in the Dreamcast somewhere it suits you,
    or do as I did, and use the ventilation hole that is the closest
    to the AV out on the outside of the DC.
    Pull the cable through for about half a meter or so to make the
    procedure a bit more easy; you can pull it back out of the DC
    once you are finished.
    Split the cable into two, so that you've got four wires for the
    top and four wires for the bottom of the mainboard.

9-  I suggest to handle the top section first since the contacts you need
    to solder on are more sturdy here. Attach the four wires to the points
    indicated in the diagram. This is very delicate work, so use a magnifying
    glass if nessessary. Once you're sure you've attached them correctly,
    put some tape over the contacts to hold the connections firmly in place.

10- Now turn the mainboard around, making sure not to put too much stress
    to the wires you've just soldered. Take the other four wires and solder
    them to the other points indicated in the diagram.
    Be very careful now since the contacts themselves will easily let go
    from the mainboard if pulled too hard!
    Also, connect the two other points to eachother; this will activate
    the output of RGB signals. If preferred, you can add a switch between
    these two to switch RGB on or off; may be handy in case you want to
    use a VCR to tape from the Dreamcast..

11- Ok, all the wires should be in place. Place the mainboard back in the
    casing, making sure the two dark pieces of heat-conducting material
    are placed on the two sockets before doing so. Also pay attention
    that you do not obstruct the ribbon cable.
    Put the nessasary screws in place and if needed, place the cooling
    system back on the processors. Also check if the thermal safeguard
    is still connected to the mainboard

12- Attach the metal shielding. Again, make sure the ribbon cable cable
    is properly laid around any points that are going to be screwed

13- Attach and screw the CD drive to the metal.

14- Attach and screw the plastic and the powerboard. Then, plug the
    powerswitch cable back.

15- Attach and screw the joypad interface board, connecting the fan
    power cable and the ribbon cable.

16- Attach the top part of the Dreamcast casing.

17- Start up the DC and doublecheck if the fan is spinning.

Now, plug the scart in your TV and if all went well, you should now be
enjoying the best possible image quality!

Grtx, Ryu

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