PM-41 (2) MM3 modchip installation diagram

Towards the end of the SCPH-10x PSone production Sony revised the board slightly and released the PM-41 (2) board. This page covers the installation diagram for installing an MM3 chip into the PM-41 (2).

If your board has PM-41 printed on it then you should follow the PM-41 guide instead.

For more information about MM3 chips click here, for more information about PS1 modchips click here.

The first time I modded a PM-41 (2) I wasn’t able to find an installation diagram, but was able to figure out how everything should be wired through a combination of trial and error, and the diagram for the original PM-41 board.

PM-41 (2) board components and fuse locations

Here are a couple of photos of the PM-41 (2) board. If you click on them they’ll open in a much higher resolution format so you can zoom in on the details. This first image shows the front of the board (marked with the letter A).

PM-41 (2) board front

This second image shows the back of the board (marked with the letter B).

PM-41 (2) board back

Below is that picture of the front of the board again, but this time it has labels on all of the major board components. This can be useful if you are debugging an issue on the system. For example if your video output is bad you might want to try replacing the capacitors near the video amplifier.

PM-41 (2) major components

Another common issue people run into is blown fuses. Below is a diagram showing the locations of all of the fuses on the PM-41 (2) board. They are highlighted in yellow, with the fuse value nearby.

PM-41 (2) fuse locations

PM-41 (2) MM3 modchip installation diagram

PM-41 (2) MM3 installation diagram

Above is the installation diagram. Just match each colored pin label in the diagram with any matching colored point on the board. Click on the image for a higher resolution version. I recommend placing the modchip on top of the CD mechanics processor chip.

I have created additional diagrams primarily for colorblind people. They show one point at a time in a single color (there is a set in red, green, and blue). Because they show the entire board they may reveal more alternative points for each pin. Click on the links below to reveal the sets of images.

I’m creating these new diagrams for each PS1 board revision working from newest revision to oldest revision. It’s going to take some time, but should hopefully be more helpful than the older diagrams I had on here before.

PM-41 (2) MM3 modchip installation diagram (one diagram per pin, colored in red)

Click on the images to see them in higher resolution.

VCC: Pin 1, Pin 4

PM-41 (2) VCC point in red

Stealth: Pin 3

PM-41 (2) stealth point in red

GATE_WFCK: Pin 5

PM-41 (2) GATE_WFCK point in red

DATA: Pin 6

PM-41 (2) DATA point in red

CD Door: Pin 7

PM-41 (2) CD door point in red

GND: Pin 8

PM-41 (2) GND point in red

View individual points in red

PM-41 (2) MM3 modchip installation diagram (one diagram per pin, colored in green)

Click on the images to see them in higher resolution.

VCC: Pin 1, Pin 4

PM-41 (2) VCC point in green

Stealth: Pin 3

PM-41 (2) stealth point in green

GATE_WFCK: Pin 5

PM-41 (2) GATE_WFCK point in green

DATA: Pin 6

PM-41 (2) DATA point in green

CD Door: Pin 7

PM-41 (2) CD door point in green

GND: Pin 8

PM-41 (2) GND point in green

View individual points in green

PM-41 (2) MM3 modchip installation diagram (one diagram per pin, colored in blue)

Click on the images to see them in higher resolution.

VCC: Pin 1, Pin 4

PM-41 (2) VCC point in blue

Stealth: Pin 3

PM-41 (2) stealth point in blue

GATE_WFCK: Pin 5

PM-41 (2) GATE_WFCK point in blue

DATA: Pin 6

PM-41 (2) DATA point in blue

CD Door: Pin 7

PM-41 (2) CD door point in blue

GND: Pin 8

PM-41 (2) GND point in blue

View individual points in blue

Installation tips

Here are some tips I have for you when you are soldering your chip into the PM-41 (2).

  • Cut your wires to be as short and direct as possible.
  • Don’t connect pin two of the chip to anything.
  • Pin 3, and 6 can be tricky. Don’t push on the components with your soldering iron or they might get knocked off the board. You can use tweezers to carefully solder them back on one side at a time, the orientation doesn’t matter.
  • Make sure the wire on pin 3 and 6 don’t come into contact with both sides of the component (this is especially common if you run the wire directly on top of the component).

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.

Here is an example installation have done:

PM-41 (2) MM3 example installation

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Sean
Sean
May 20, 2018 2:00 PM

I just installed the MM3 I bought from you on ebay on a PM-41 (2 ) board. It works great. Tiny amounts of solder and a gentle hand with the iron made for a successful first attempt. Thanks for hooking me up.

Mark
Mark
April 27, 2018 3:11 AM

Attempted my first ever mod chip installation with this board today. I bought some of your pre-wired chips off of ebay.

Man, some of those soldering spots are so tiny. But fortunately I got them all in place according to the diagram and it worked great!

Tomorrow I’ll attempt console #2.

Volker
Volker
May 24, 2018 10:20 AM

hello!
i have got a problem: i soldered like the diagram shows but it doesnt work somehow…how do I have to solder pin 3 and 6? should i get them off at first?

Volker Otten
Volker Otten
May 25, 2018 7:58 AM
Reply to  William Quade

unfortunately it is too late – my psone-board is already broken. my problem was to handle pins 3 and 6: at first i soldered the wire on top of the resistors but that didnt work so i tried to get the resistors carefully off the board but then it suddenly flew away (even handeled with a tweezer) and i didnt find it back again. it is too tiny to find. the other resistor even broke as i tried to get it off the board – soldering to all other points was successful and easy but those damn tiny resistors killed… Read more »

Jeremy
Jeremy
June 4, 2018 9:03 PM

Hi guys I purchased one of the chips for my psone schp-101 and the number 3 resistor or whatever it is come off and I’m having a hard time getting it back on. Any suggestions? I have the chip still just can’t get t to stay in place.

Ahyan R
Ahyan R
January 3, 2019 2:04 AM

Hi William. I have SCPH-103 with 12C508/P 04 SAW 0449 installed. Couple days ago, I decide to replace the old optical laser because is to weak read disc with new one I bought online. But accidentally, when I want to put it back together, one cable from pin 2 has disconnected from mainboard. And when I turn it on, I can’t hear psone sound from TV just a white screen with PS1 orange logo. I take my psone to local service center, and the guy on the store tell he forgot psone wiring but he do soldering and it not… Read more »

Evan
Evan
October 2, 2019 1:15 AM

Hello just got done doing a mm3 on psone scph 101 and it will not power on or soon disc. It only powers on when you pull up on the power cord still does not spin. Any ideas on what that could be?

Zeph
Zeph
May 14, 2020 1:42 AM

Hey just wanted to say I just tried the new Point 5 and it works perfectly. Thank you so much. This is my 2nd system I’ve modded with your site. I placed the chip between the 2 chips on the diagram and my Point 4 is connected to Point 1 and I used the large points right above the “41” on the Diagram Key for Power and Ground (1 and 8) and I was able to keep all the wires short except 6 and 7. I have really good boots tho and it is way better than the fat model… Read more »

Rodolfo
Rodolfo
November 9, 2020 1:41 PM

Queria saber qual peça é responsável pela vibração doa controles..pois o meu psone slim parou de vibrar..desde já agradeço

Nathan Face
Nathan Face
April 14, 2018 5:33 PM

What’s going on with the 4 pin in your picture? it looks like it’s soldered to the 1 pin

Curtis E Anderson
Curtis E Anderson
April 18, 2018 8:05 PM

The diagram looks good. Like Nathan said, I think the Pin 4 adjustment should be mentioned in the instructions.
Also I’d like to know what the red dots are for. they were a bit confusing and I saw them on other diagrams.
Speaking of other diagrams I’ve seen one where pin 3 is one resistor over incorrectly (?) It looks like you adjusted the diagram because of that, but I think that shoud also be mentioned in the instructions.

Matt Nitchie
Matt Nitchie
May 12, 2020 4:38 PM
Reply to  William Quade

Is pin 5 correct in the above diagram? Every other wiring chart I’ve seen has it placed a few solder points left, including the photograph you give as an example.