# PM\-41 \(2\) ONEchip modchip installation diagram \- William Quade Canonical: Language: `en-US` ![PM\-41 \(2\) ONEchip installation diagram](https://quade.co/wp-content/uploads/2020/05/pm-412-onechip.jpg) 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 a ONEchip chip into the PM\-41 \(2\)\. If your board has PM\-41 printed on it then you should follow the [PM\-41 guide](https://quade.co/ps1-modchip-guide/onechip/pm-41/) instead\. For more information about [ONEchip chips click here](https://quade.co/ps1-modchip-guide/onechip/) , for more information about [PS1 modchips click here](https://quade.co/ps1-modchip-guide/) \. # 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](https://quade.co/wp-content/uploads/2020/05/pm-412-front-1-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-front-1.jpg) This second image shows the back of the board \(marked with the letter B\)\. [![PM\-41 \(2\) board back](https://quade.co/wp-content/uploads/2020/05/pm-412-back-1-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-back-1.jpg) 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](https://quade.co/wp-content/uploads/2020/05/pm-412-board-components-1-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-board-components-1.jpg) 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](https://quade.co/wp-content/uploads/2020/05/pm-412-fuses-1-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-fuses-1.jpg) # PM\-41 \(2\) ONEchip modchip installation diagram [![PM\-41 \(2\) ONEchip installation diagram](https://quade.co/wp-content/uploads/2020/05/pm-412-onechip-1024x972.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-onechip.jpg) 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 \(2\) ONEchip modchip installation diagram \(one diagram per pin, colored in red\) Click on the images to see them in higher resolution\. **VCC: Pin 1** [![PM\-41 \(2\) VCC point in red](https://quade.co/wp-content/uploads/2020/05/pm-412-vcc-red-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-vcc-red.jpg) **Stealth: Pin 2** [![PM\-41 \(2\) stealth point in red](https://quade.co/wp-content/uploads/2020/05/pm-412-stealth-red-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-stealth-red.jpg) **BIOS D2: Pin 3** [![PM\-41 \(2\) BIOS D2 point in red](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-d2-red-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-d2-red.jpg) **BIOS A18: Pin 4** [![PM\-41 \(2\) BIOS A18 point in red](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-a18-red-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-a18-red.jpg) **GATE\_WFCK: Pin 5** [![PM\-41 \(2\) GATE\_WFCK point in red](https://quade.co/wp-content/uploads/2020/05/pm-412-gate_wfck-red-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-gate_wfck-red.jpg) **DATA: Pin 6** [![PM\-41 \(2\) DATA point in red](https://quade.co/wp-content/uploads/2020/05/pm-412-data-red-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-data-red.jpg) **CD Door: Pin 7** [![PM\-41 \(2\) CD door point in red](https://quade.co/wp-content/uploads/2020/05/pm-412-cd-door-red-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-cd-door-red.jpg) **GND: Pin 8** [![PM\-41 \(2\) GND point in red](https://quade.co/wp-content/uploads/2020/05/pm-412-gnd-red-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-gnd-red.jpg) View individual points in red ## PM\-41 \(2\) ONEchip modchip installation diagram \(one diagram per pin, colored in green\) Click on the images to see them in higher resolution\. **VCC: Pin 1** [![PM\-41 \(2\) VCC point in green](https://quade.co/wp-content/uploads/2020/05/pm-412-vcc-green-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-vcc-green.jpg) **Stealth: Pin 2** [![PM\-41 \(2\) stealth point in green](https://quade.co/wp-content/uploads/2020/05/pm-412-stealth-green-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-stealth-green.jpg) **BIOS D2: Pin 3** [![PM\-41 \(2\) BIOS D2 point in green](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-d2-green-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-d2-green.jpg) **BIOS A18: Pin 4** [![PM\-41 \(2\) BIOS A18 point in green](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-a18-green-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-a18-green.jpg) **GATE\_WFCK: Pin 5** [![PM\-41 \(2\) GATE\_WFCK point in green](https://quade.co/wp-content/uploads/2020/05/pm-412-gate_wfck-green-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-gate_wfck-green.jpg) **DATA: Pin 6** [![PM\-41 \(2\) DATA point in green](https://quade.co/wp-content/uploads/2020/05/pm-412-data-green-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-data-green.jpg) **CD Door: Pin 7** [![PM\-41 \(2\) CD door point in green](https://quade.co/wp-content/uploads/2020/05/pm-412-cd-door-green-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-cd-door-green.jpg) **GND: Pin 8** [![PM\-41 \(2\) GND point in green](https://quade.co/wp-content/uploads/2020/05/pm-412-gnd-green-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-gnd-green.jpg) View individual points in green ## PM\-41 \(2\) ONEchip modchip installation diagram \(one diagram per pin, colored in blue\) Click on the images to see them in higher resolution\. **VCC: Pin 1** [![PM\-41 \(2\) VCC point in blue](https://quade.co/wp-content/uploads/2020/05/pm-412-vcc-blue-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-vcc-blue.jpg) **Stealth: Pin 2** [![PM\-41 \(2\) stealth point in blue](https://quade.co/wp-content/uploads/2020/05/pm-412-stealth-blue-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-stealth-blue.jpg) **BIOS D2: Pin 3** [![PM\-41 \(2\) BIOS D2 point in blue](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-d2-blue-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-d2-blue.jpg) **BIOS A18: Pin 4** [![PM\-41 \(2\) BIOS A18 point in blue](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-a18-blue-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-bios-a18-blue.jpg) **GATE\_WFCK: Pin 5** [![PM\-41 \(2\) GATE\_WFCK point in blue](https://quade.co/wp-content/uploads/2020/05/pm-412-gate_wfck-blue-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-gate_wfck-blue.jpg) **DATA: Pin 6** [![PM\-41 \(2\) DATA point in blue](https://quade.co/wp-content/uploads/2020/05/pm-412-data-blue-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-data-blue.jpg) **CD Door: Pin 7** [![PM\-41 \(2\) CD door point in blue](https://quade.co/wp-content/uploads/2020/05/pm-412-cd-door-blue-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-cd-door-blue.jpg) **GND: Pin 8** [![PM\-41 \(2\) GND point in blue](https://quade.co/wp-content/uploads/2020/05/pm-412-gnd-blue-1024x683.jpg)](https://quade.co/wp-content/uploads/2020/05/pm-412-gnd-blue.jpg) 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\.** - 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\. # 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\. - None yet\.