V9 Modbo modchip installation diagram

One of the last revisions of the fat PlayStation 2 was the V9. They were found in many of the SCPH-5000x models. They feature a quieter fan when compared to earlier models, and require some form of a laser fix. Matching console model numbers and board numbers are listed below.

You can find the model number on the sticker on the bottom of the console, and the board number is printed on the PS2 main board if you take apart your console. Note that there can be multiple board numbers within a specific model number.

  • NTSC-J (Japan):
    • SCPH-50000 (GH-023)
    • SCPH-50005 (GH-023)
    • SCPH-50006 (GH-023)
    • SCPH-50007 (GH-023)
    • SCPH-55000 (GH-023)
  • NTSC-U/C (USA)
    • SCPH-50001 (GH-023)
  • PAL
    • SCPH-50002 (GH-023)
    • SCPH-50003 (GH-023)
    • SCPH-50004 (GH-023)

Note that there are multiple versions of the Modbo modchips available, but the installation diagrams are all the same. Some example versions are Modbo 3.0, Modbo 4.0, Modbo 5.0, and Modbo 750.

For more information about Modbo modchips click here, for more information about PS2 modchips in general click here.

V9 Modbo installation diagram

Modbo modchip pinout

V9 Modbo installation diagram

V9 laser fix diagram

There was a defect in the design of the V9 console that can cause the laser to burn out when playing back games once a modchip has been installed. There was a fix for this problem called the Romeo laser fix.

This fix involves lifting a pin on a chip, and then connecting that pin to a 5V point on the board.

V9 Romeo laser fix diagram

Installation tips

Here are some tips I have for you when you are soldering your chip into a V9.

  • Using 30 AWG solid core wire works well for most of the points.
  • Use some thicker wire for the 5V and ground wires.
  • Use even thinner wire for the B, G, I, and A points. 36 AWG enamel coated wire works well.

Diagram success rate

Here’s a list of people who have successfully modded their console with this diagram. Leave a comment and I’ll add you to the list.

  1. William Quade (me)

Example installations

This section has photos of some successful installations which you can use to get a better understanding of how everything is wired and positioned. Leave a comment and I’ll add your installation to the list

  1. William Quade (me)

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William QuadeEdRinweyenbergh jerome Recent comment authors
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I’m planning to do a modchip installation soon, and after a bit of googling, I’m a bit confused about the Romeo laser fix.
There’s this forum thread I’ve found online saying that it’s complete bogus, and it doesn’t help with anything, but I’m not sure about that.
I plan to play hard copies of import games, and it seems like the Romeo laser fix is for burned games. Should I still do the laser fix, or do I just leave it alone? Thanks in advance.

weyenbergh jerome
weyenbergh jerome

Hi, I’ve successfully modded a V9 GH-023, if you’re interested in my pictures, I posted them here : https://t.co/1gxFGwoHi5
If you find the other pictures interesting, feel free to use them as you see fit, they are ALL 100% made by me and 100% open source.


Are you sure SCPH-55000 is V9? I sent my PS2 to someone who specializes in soldering, and they said that the motherboard diagrams for both V9 and V10 aren’t compatible with my PS2. My PS2 has the code of GH-026 if that helps, and I could send a picture of it if needed.. Any idea what diagram I should use?


Do you know any pic fix solutions for v9s? I have read posts from voultar and l_oliveira that mention the issue with v9-v12 PS2s were with the mechacon frying the laser coils when it crashes. They also claim that lowering the power to the laser didn’t solve the problem and only made the laser work harder.