I forgot to tell you that I replaced the optocouplers.
All optocouplers have been replaced.
D101(STPS20H100C) was the cause.
I noticed that if I connect only the 5V line to the PS4 without the 12V line connected and turn the power on, the 5V line is lost and the power supply is locked.
I thought there was something wrong with the line that was generating the 5V, so I compared D101 with the donor and the values were different, so I replaced it.
The result was a great success.​

We repaired an ADP-240CR that was not producing 12V properly.
DDA001AG and 1608B were broken, so they were replaced and 12V came out normally, but when connected to the main unit and turned on, it immediately shuts down.
Then 5V is not output and the power supply locks up.
When the power cable is disconnected and reconnected, the lock is released.
I have seen the locking symptom when there is something wrong with the 1608B, so I replaced it with another 1608B, but the situation remains the same.

I transplanted major ICs such as DDA001AG, DAS001, 1608B, DNP012A,...