PM-41 ONEchip modchip installation diagram

.Towards the end of the PlayStation 1’s life Sony released a slim model called the PSone, or SCPH-10x. Many of these systems have PM-41 boards inside, which is what this page covers. Some of the boards are PM-41 (2) and require you to use a different diagram. The model is printed on your board if you take apart your console.

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

PM-41 ONEchip modchip installation diagram

ONEchip chip pinout

ONEchip modchip installation diagram

Above is the installation diagram. It is from FatCat.co.nz.

Installation tips

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

  • Cut your wires to be as short and direct as possible.
  • Pin 2, 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 wires you are soldering don’t come into contact with other components or legs of chips.

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. Nobody yet.

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.

  1. None yet.
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MobCat
MobCat
February 27, 2019 10:54 AM

The original un edited diagram comes from FatCat.co.nz. you should always give credit where credit is due
http://www.fatcat.co.nz/psx/install/102/ONEchip8.html

Damian
Damian
March 17, 2019 4:40 AM

Hello again

Do You know if length of wire affects only booting games? Or it could also affect reading discs?

Cheers

Damian
Damian
March 17, 2019 9:17 AM
Reply to  William Quade

Thanks. While everything works I have a weird feeling that console more struggles with certain discs.

M.DaSilva
M.DaSilva
March 28, 2019 3:46 PM

Hi! Just successfully installed this modchip on my PSOne, works a treat!

Josh
Josh
October 22, 2019 7:43 AM

Hello, I just used the diagram and it seems to have worked fine. Only issue I found was with the PSOne not recognizing genuine and burned games the first few times I tried. But after it stopped playing up it just worked. Is this normal for the onechip. will the PSOne play the NTSC games at 60htz?

Josh
Josh
October 22, 2019 6:20 PM
Reply to  William Quade

The wires are as short as possible, quite proud of the work actually. I drew inspiration from the Youtuber Voultar. Here is a link, if its clean enough feel free to share it on this page https://imgur.com/a/WBzmZUi . I don’t think I have a worn out laser, but can you explain in more detail the decoupling capacitor please? I just tried it out again and got an instance of the red screen asking for a playstation format disc, did a reset and the game played fine. Is this a faulty mod chip or is it still possible that I may… Read more »

Josh
Josh
October 23, 2019 1:00 AM
Reply to  William Quade

Yes the console did read genuine games properly before the mod. And yes the system did not recognize the first genuine game I put into it after the mod, but did after the reset. Also I have a few backups from someone that sold me a psx ages ago. These games are difficult to get going and some of them are read as music cd’s. Any back ups I have made are easier to read, still needing a reset sometimes to get it going. I don’t have any genuine import games to try with it. But yes I can understand… Read more »

Josh
Josh
October 26, 2019 3:08 AM
Reply to  William Quade

Ok, thanks William. I will re investigate the install and let you know how I go. Thanks.

auanasgheps
auanasgheps
September 29, 2020 4:58 AM

I know ONEChip because of you, thanks!
Installed it successfully in a PM-41 board. Install was tricky because point 5 was gone from previous modchip and we had to wire it up from the main CPU, but at the end is a success!