Recently I received my PS4 which I sniped on eBay as being for spares and repair. Sometimes, just sometimes spares means power cable is not working due to a blown fuse or there is a software failure which after hard reset returns back to life.

Not this time.

Here is a short list of steps involved.

1. Connect JTAG cable to 3.3V capable serial interface.
2. Make sure that cable has TX and RX swapped and only GND is connected, VCC should not be.
3. Run putty or other terminal software. Use baud rate 115200, 8 data bits + 1 stop bit, no parity or flow control