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. It can also be more time consuming to find the right resistor value if the 1.5k resistor doesn’t work.

    To test the PIC fix installation connect pin 4 to GND instead of point K. If the system turns on and then off about 3 seconds later then the installation is good. If the system never turns on (or the red system light doesn’t even turn on) then that means the resistor value is too low (try a 2k resistor). If the system doesn’t turn off then you might need to try a lower resistor value, or you might have an issue with your chip or installation.

  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 modchip example installation

Subscribe
Notify of
guest
38 Comments
Most Voted
Newest Oldest
Inline Feedbacks
View all comments
lgk
lgk
May 16, 2019 5:12 PM

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.

Charles
December 11, 2018 3:54 PM

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

david
david
February 24, 2019 11:37 PM

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

david
david
February 25, 2019 5:58 PM
Reply to  William Quade

Sent you an email. Thanks!

迪奧
迪奧
March 13, 2019 12:46 AM

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

迪奧
迪奧
March 13, 2019 8:05 AM
Reply to  William Quade

Thanks, your article has taught me a lot of experience.

JaNoZ
JaNoZ
December 10, 2019 11:25 AM

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.?

JaNoZ
JaNoZ
December 13, 2019 9:42 AM
Reply to  William Quade

I did the mod on V13 with SMT and the drive acted weird and could only read original DVD video, the rest was a failure.
The mod removed again, so a few ps2 discs and a few copy’s do work now, but most do not at all and keep loading long and make strange seek pickup noises.
I think the laser is a bit snafu.

Zach F.
Zach F.
January 21, 2020 10:53 AM

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 »

rd
rd
January 28, 2020 12:02 PM

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

rd
rd
January 28, 2020 12:07 PM
Reply to  William Quade

thanks….one more thing can u plz make a blog on how to add hdd on this board !!

Justin
Justin
February 20, 2020 11:20 PM

Do you sell Matrix PIC fix?

muzzmobile
muzzmobile
March 4, 2020 1:56 AM

Is there an alternative point for solder point M. Mine is damaged and won’t take any solder

muzzmobile
muzzmobile
March 4, 2020 1:33 PM
Reply to  William Quade

Thanks for that William. Point M has basically completely gone will this create an issue? I’m thinking it’s broken the circuit. Cheers

muzzmobile
muzzmobile
March 4, 2020 10:54 PM
Reply to  William Quade

I’ve just put it all back together without the modbo so back to stick and there is no video or audio. Any idea if that pad may have been the cause? Cheers

Tristin Leonard
Tristin Leonard
March 24, 2020 8:13 PM

was able to use this to mod my V12 board thanks a ton

Bud
Bud
April 20, 2020 1:38 PM

Thanks for all these guides you’ve made for various systems and chips. You’ve done an amazing job cataloguing all of this in one place. You also have the absolute BEST teardown guide for 700XX slims!

On to my question – I was curious if the PIC fix file could be written to a 12C509 instead of a 12C508, just like the MM3 can be for PS1? I haven’t worked with these chips before and want to make sure I can use a 12C509 for both before I buy a few. Thanks!

Mike
Mike
May 2, 2020 10:27 PM

I lifted the pad at cx on the board is there another spot I can solder to on the ps2 board

Jackson Young
Jackson Young
May 28, 2020 6:23 AM

The Rsf one of my boards is a 303. It is not a 01D. Should I use a 560R?

John
John
July 13, 2020 5:05 PM

Hello
Thanks for your info !
I put a picture of mine ps2
V12 ps2 Modbo 5.0 with summ0ne’s fix

John
John
July 30, 2020 7:57 AM
Reply to  John

picture

IMG_20200707_201017.bmp
John
John
July 18, 2020 10:58 AM

Hello
thanks for your useful infos
i have a problem
i installed the modbo 5.0 on my v12 succsefully
when i play a backup game after the ps2 heat the game start freezing some times it doesnt load or says “please insert a playstation format disc”
can you help me about?
thanks !!!

John
John
July 20, 2020 12:41 PM
Reply to  William Quade

i change the laser but nothing after 5-10minutes of game start freezing..after reset the ps2 maybe not load the game

titifayls
titifayls
July 22, 2020 10:35 AM

Hello , possible to have the HEX for PIC Fix send on my mail ? thank you
my mother board is GH-035-21 but on shell the model is scph-70004 PAL ,
must be fixed even if not USA model ?

Last edited 23 days ago by titifayls