Ps5 edm-033 will not boot

well, one day it just will not turn on. so i take it apart found psu was dead. after replace the PSU. now i got one beep no power. totally new to console repair.
i got 12v incoming, push power button no voltage drop.
at f7002 i got 5v and 3v.
at f7001, i got 5v on both side of the fuse.
i visually check the whole board, no obvious damage components.
when i press power button, it beep once, no light, no fan spin. but will not beep if i keep pressing the button. after 12-15 seconds, i press power button beep again.
where should i go from here?