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Sony PlayStation Dual Frequency Oscillator Install Guide

Install guide for adding a Dual Frequency Oscillator to a Sony PlayStation. The dual frequency oscillator will allow a region modified console to have a correct video clock frequency relative to the video refresh rate, rather than an out of spec one when using a forced video refresh rate.

SCPH-100X PU-8

Unconfirmed / Work in Progress

Still to add ground and 3.5V locations. But these should be easy to find with a multimeter.

SCPH-550X PU-18

Confirmed / Working

This is an underside install location which requires a DFO with a PCB thickness of 0.8mm. It might be necessary to add some tape to the RF shield to prevent the top of the 27mhz Crystal from touching the RF shield. Although this might not be necessary.

  • Remove the 220ohm resistor connecting X201 to GPU Pin 192. This will completely isolate the clock from the GPU ready for the DFO clock to be used instead.
  • Connect DFO SO pad to the underside point that connects to GPU Pin 157. This pin will change from Ground and 3.5V depending on the region of the game being run. This is used to switch the DFO's frequency .
  • Connect DFO CLK OUT pad to the underside location that connects to GPU Pin 192. Place a 220ohm resistor between DFO CLK OUT and the solder point.

SCPH-700X PU-20

Coming Soon

SCPH-750X PU-22

Confirmed / Working

This is an underside install location which requires a DFO with a PCB thickness of 0.8mm. It might be necessary to add some tape to the RF shield to prevent the top of the 27mhz Crystal from touching the RF shield. Although this might not be necessary.

  • Remove the 220ohm resistor connecting IC204 Pin 1 to GPU Pin 192. This will completely isolate the clock from the GPU ready for the DFO clock to be used instead.
  • Connect DFO SO pad to the underside point that connects to GPU Pin 157. This pin will change from Ground and 3.5V depending on the region of the game being run. This is used to switch the DFO's frequency.
  • Connect DFO CLK OUT pad to the underside location that connects to GPU Pin 192. Place a 220ohm resistor between DFO CLK OUT and the solder point.

SCPH-900X PU-23

Coming Soon

SCPH-10X PM-41

Coming soon

Install Notes

If installing by removing the 220 resistor on the PlayStation mainboard that goes to GPU Pin 192 it will be necessary to install a new 220ohm resistor between the DFO CLK OUT pad and the solder point. This is to replace the one that was removed from the PlayStation mainboard. Alternatively the 18ohm resistor that sits on the DFO just before the CLK OUT pad can be removed and replaced with a 220ohm resistor SMD part. This will make the installs a little neater.