820-3662-A Pulsing PM_SLP_S4_L

[Naevius]

This 820-3662-A board has a pulsing PM_SLP_S4_L. S5 rails are stable.
Checked around the U6100, but no visible damage. Termination resistors are good.

Currently I don't have a donor board for this, so can't replace U6100 to test. Any other things I could measure or try before buying a donor board?

 

[2informaticos]

All S3 voltages should pulse too, check that.
PM_SLP_S3_L pulsing too?
ALL_SYS_PWRGD pulses?

You don't need to replace U6100.
Make backup and reflash with new BIOS, if you want.

Be aware of f***g CPU power supply in this board; FDMF6808 cause lot of weird issues...