PS2 PS1 games on SCPH-75004 with Matrix modchip

[Adam0717]

Hello, recently I picked up a silver PS2 Slim SCPH-75004 and to my surprise it came with a modchip installed. Matrix Infinity, supposedly a clone, but I never opened the console, so I do not know.

My question would be following. The console starts up import PS2 games, burnt PS2 games and original PS2 games (silver/blue) just fine. But as soon as I insert an original/burnt PS1 game, I get scared by the Red screen of death. I repaired tons of PlayStation 2s, so I can assume from the sounds of the laser, that it detects and reads the disc just fine. It just gives me the RSOD.

Is there a button combination on the controller or with the power button of the console, that I have to do, before starting up a PS1 game with this modchip? Any help is appreciated, thank you!

 

[gamerman 5000]

To check that your modchip is not a clone you must find out if when you make changes to the configuration (press triangle and circle simultaneously for 2 or 3 seconds when the matrix logo appears) it saves the changes, if it does not then it is a clone.
I understand that PSX discs must be original for the PS2 to recognize them, here you are already talking about a "copy" of the original.

 

[Adam0717]

To check that your modchip is not a clone you must find out if when you make changes to the configuration (press triangle and circle simultaneously for 2 or 3 seconds when the matrix logo appears) it saves the changes, if it does not then it is a clone.
I understand that PSX discs must be original for the PS2 to recognize them, here you are already talking about a "copy" of the original.

I opened the system and this is what I found. When pressing triangle+circle, the settings get saved. I looked for shorts with my multimeter, there are no shorts between the cables and to ground either. Chip gets 3.3V when measured. Tried other lasers that I had laying around. Always the same issue, with original and with burnt PS1 game I get the same "Please insert a PlayStation or PlayStation 2 disc."

I gave the whole system a clean, and reassembled it as it was. I guess I got to live with it, probably a small defect with the chip itself, it's very old after all. The date on the sticker on the bottom of the console said 2008. Silver / double layer / blue original PS2 games work fine. Burnt PS2 games work fine, and so do imports NTSC/U games and Japanese games tested. It also reads DVD movies from any region flawlessly. So I don't bother anymore, I'm happy to have one modchipped console laying around.

 

[gamerman 5000]

Maybe the modchip only has the "Boot Mode" option configured as "DVDV" instead of "AUTO" and that is why the chip does not recognize it. It wouldn't hurt to verify it.

 

[Adam0717]

I set it to AUTO, I also tried almost everything, and I get welcomed by the same screen again, so yeah.

 

[gamerman 5000]

Well, you tried.

 

[Adam0717]

Well, you tried.

I did some research on this chip, and the wiring diagram for SCPH-75004. As I understood the SX pin is responsible for PlayStation 1 games. I found this useful diagram.

I checked my mainboard, and I had to find out that the guy who made this job like 15 years ago, changed the SX and Y pins on the modchip. I have the GH-041-14 board so I gave a try for my bad soldering skills and did the following.

Changed SX wire with Y wire, and resoldered Y wire to the right pin on the mainboard, as that was wrong as well. And yes, everything works now. Original, burnt PS1 games, any PS2 game, DVDs etc. And it made me very happy.

 

[gamerman 5000]

Wow, sometimes something so simple can give you "headaches", good thing you figured it out.

 

[alexboanta3107]

Same on my 50004 console with modbo 750

 

[Berion]

Maybe you didn't burn properly PSX game (on CD-R, CD-RW probably will fail as PS2 ODDs have hard time to read RW discs). Mode 2: 2352, don't fix ECC.

 

[R3Z3N]

Glad you got it working. FYI Green Dot MI is the only MI that had updates for BootRom 2.20, the last antimodchip bootrom. 75k (yours) and up have BootRom 2.2 until the last 90k with 2.30 and the Sony PS2TV 2.50

The FPGA VHDL is the same in ALL of the other MI EXCEPT for GreenDot. Updating the FW =/= updating the FPGA! The FPGA (ACTEL APA075-F) IS NOT UPDATEABLE by end user, otherwise clones would be insanely easy. Its a 79bit key to re-write these...do the math.

So, backups/BOOTROM patches may not behave as expected in your console since you have a blue dot! This is can be confirmed by reading the team notes that are archived on the wayback machine and other statements they made when they were around.

Homebrew should be fine, but common problems one sees with modchips that are not supported for a given console: inability to boot Firmware update/upgrade disks, inability to boot disks or backups at all, or partial support, or worse case no boot at all.

I have much to update but you can find a little more here:
https://web.archive.org/web/2005122...initymod.com/cgi-bin/matrix/site.pl?page=news

December 6, 2005
Clarification on Firmware V1.68.

We wish to better clarify the following points regarding the Firmware V1.68:

1) The firmware can be used on ALL Infinity produced until now.
YELLOW dot, BLUE dot, ORANGE dot and the latest GREEN dot.

2) For the V14 PSTWO and higher release you will need anyhow to use a GREEN dot Infinity.

November 27, 2005
V14 Upgrade for Infinity.

Analysis and development for the V14 model is finally complete.
Due to changes in the V14 hardware the old recovery mode was not compatibe and had to be redesigned.

The new color code for this Infinity will be GREEN, and the V14 firmware will be already on board of the
Actel processor.
The GREEN DOT Infinity are thus fully V1-V14 compatible and 100% stable, and are now being shipped
our resellers.
Installation manual and new firmware upgrade for V1-V14 consoles will be online soon.