Use a voltage regulator to drop 5VSB to 3.3V. Or, simpler: Use a small 3.3V linear regulator (e.g., AMS1117-3.3) fed from 5VSB. Some PS4 models (rarely) accept 5V standby if their onboard regulator handles it – but do not risk it. True 3.3V is required.
Use a small relay or an NPN transistor (2N3904). Connect base to PS4’s PS_ON via a 10k resistor. Emitter to ground. Collector to ATX green wire. Also pull green wire up to 5VSB via a 1k resistor. When PS4 sends 3.3V, transistor turns on, pulls green low → PSU starts. adaptar fuente de pc a ps4 fat
That said, if you succeed, you will own one of the few PS4 Fats that can run for hours without the internal PSU heating up the case – a true custom mod. Adapting a PC power supply to a PS4 Fat is not a beginner project. It requires understanding ATX specifications, standby voltage regulation, and transistor logic. But for the dedicated hardware hacker, it’s a rewarding way to resurrect a dead console without buying proprietary parts. Use a voltage regulator to drop 5VSB to 3