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.
PM-41 MM3 modchip installation diagram
Above is the installation diagram. Just match each colored pin label in the diagram with any matching colored point on the board. There is a second image of the chip in the diagram showing a good place to position the chip.
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.
- 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).
- Don’t apply too much solder to pin 2 or you’ll bridge the pins on the chip.
- Placing the chip on top of the chip between pins 3 and 7 seems to be the ideal location for the chip. Placing the chip where it is in the diagram won’t work when putting the metal shielding back in place.
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.
- William Quade (me) (I’ve used this diagram many times and haven’t had any problems with it)
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 showing a MM3 chip I installed onto a PM-41 board.