V12 Modbo modchip installation diagram

The very first revision of the slim PlayStation 2 was the V12. They were found in most of the SCPH-7000x and all SCPH-7001x models. They retain full PS1 backwards compatibility, 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-70000 (GH-035-11)
    • SCPH-70006 (GH-035-11)
    • SCPH-70007 (GH-035-11)
  • NTSC-U/C (USA)
    • SCPH-70011 (GH-035-21)
    • SCPH-70012 (GH-035-21)
  • PAL
    • SCPH-70002 (GH-035-61)
    • SCPH-70003 (GH-035-61)
    • SCPH-70004 (GH-035-61)

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.

V12 Modbo installation diagram

Modbo modchip pinout

V12 Modbo installation diagram

V12 laser fix diagrams

There was a defect in the design of the V12 console that can cause the laser to burn out when playing back games once a modchip has been installed. There are three main fixes out there. I recommend installing the summ0ne’s fix at a minimum, but ideally you’d want to install the PIC fix. I don’t recommend the diode fix.

  1. summ0ne’s fix
    V12 summ0ne's laser fix diagramThis fix involves soldering two resistors to your PS2’s main board. Read the label on the resistor marked R:{303,683,01D}. Based on that value install the corresponding Rst resistor, and then install the 4.7k-ohm Rsf resistor.It’s a very easy and cheap fix that reduces the maximum power doing into the laser preventing burnout.The disadvantage to this fix is that it can reduce the effectiveness of a worn out laser (because the laser may actually need a higher voltage as it wears out).
  2. Matrix PIC fix
    V12 Matrix PIC laser fix diagramThis fix involves soldering a programmed PIC12C508 chip, along with a 1.5k-ohm resistor, to your PS2’s main board. The PIC will sense when the disc mechanics (mechacon) controller crashes, and shut off the system when that happens so the laser won’t get burned out.This is a great fix, since it only interacts with the system when things go wrong, and not all the time. The disadvantages to this fix is that it costs the most, and it could potentially shut off your system when you’re playing a game.
  3. Diode fix
    V12 diode laser fix diagram
    This fix involves soldering a couple of 1N4148 diodes to your PS2’s main board. It works by reducing the voltage of the signal coming from the CD/DVD controller, which in turn reduces the amount of voltage going to the laser.I’ve heard of many cases where a system’s laser will still burn out even with the diode fix installed. Because of that I do not recommend the diode fix. It can also reduce the effectiveness of a worn out laser (because the laser may actually need a higher voltage as it wears out).

Installation tips

Here are some tips I have for you when you are soldering your chip into a V12.

  • Using 30 AWG solid core wire works well for most of the points.
  • Use some thicker wire for the 5V and ground wires.
  • Make sure wherever you are putting your chip won’t cause any issues when putting the system back together, PS2 slims fit together very tightly.

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)

V12 Modbo example installation with summ0ne's fix

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Thanks for the useful infos.
PAL SCPH-70004 GH-032-31, you can add this revision here because it worked fine.
Just a tip, I think that’s better to place the chip on the right near “caution”.
You have to use more wire but there is more room when reassembling the console.


Hello! Thanks for all these guides, you site is awesome! I have a PS2 slim SCPH 70010 should I follow this diagram? Thanks!


Hello, where can i pick up a programmed PIC12C508 chip on a PCB as shown in install videos I have seen?


Hello, about the two resistors rst and rsf of sommOne, which are mostly wattage, thank you


Hi Guys, i have the SCPH-70004 GH-032-31 that is a V13 right, the laser resistor section looks the same as the V12, with R=683.
Does the V13 need the two resistors for laser voltage fix yes or no? and could i use SMT resistors intead or are they too light wattage for use.?

Zach F.
Zach F.

Hi William! Thank you for all the hard work you did putting this diagrams together. I’ve got my slim PS2 modded now thanks to the diagrams. An interesting note though: I have a V12 Slim PS2, model number SCPH-70012 (NTSC). The motherboard, however, did not have a GH-035-XX format motherboard. The motherboard revision was GH-032-12, which is listed as a PAL version of the V13 series. The layout was identical to your V12 diagrams so I used that, and it works perfectly. Anyway, I can share a photo of my *egregiously* bad soldering job if you want to add it… Read more »


Does this installation method will work on (GH-035-72) board??