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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David Shepherd
David Shepherd
July 12, 2020 2:08 AM


December 31, 2018 9:47 AM

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
March 23, 2019 3:23 PM

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.

April 1, 2019 8:22 PM

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?

May 4, 2019 2:43 PM

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.



March 13, 2020 2:25 AM

Hi Wiliam, I’ve installed the Modbo with the help of your guide. I’m having problems with the games running once burned to disks. I’m using Alcohol 120% 1/4 games is working consistently. The faulty burnt games are booting up past the ps2 screen then staying black? Is this a disk issue as I’m using very cheap disks? A software burning issue? or possibly that I’m using a laptop to burn the disks? Thanks for your help

March 13, 2020 2:26 PM
Reply to  William Quade

Yeah that’s what I had thought. What write speed and program would you recommend? Is it a case of the lower the write speed the better?

Leah Rowe
June 28, 2020 5:14 PM

hey will, have a look at my v9 install that i did a while back πŸ™‚

i used alt points for bios pads QTUVR, power, ground, reset, SX and CX resulting in this super clean result:

comment image

Could you link that in the guide? πŸ™‚

David Shepherd
David Shepherd
July 12, 2020 2:00 AM

Hi, GH-023 successfully modded on 24/5/20.

Last edited 3 months ago by David Shepherd
Leah Rowe
August 7, 2020 7:50 PM

yo! i did it again.comment image

What do you think of dem apples? πŸ™‚
This is my V9 modbo install, using alt points for Q, T, U, V, R, ground, vcc, cx, sx and reset.

Last edited 2 months ago by Leah Rowe
Leah Rowe
October 16, 2020 4:17 PM
Reply to  William Quade

Next time I’ll do it with thinner wires. These are 30awg but stranded, with thick insulation. Next time I’ll use 30awg solid core kynar with thinner insulation jacket, to make the work look cleaner
EDIT: also, with thinner insulation I could push two wires under those QFP pins, rather than loop in the corner like in the photo above

Last edited 12 days ago by Leah Rowe