820-3209 rails pulsing

[No-Clean]

Hi @2informaticos please let me know if you can help, thanks!

 

[2informaticos]

Pulsing every 5s, or just two times?

Clean board, still should have an history fault.

All secondary voltages pulsing?
Check at all coils, as pages 60 & 61 too.

 

[No-Clean]

Pulses every 5 seconds non stop.
Customer tried to use the mac and it just stopped working.

All coils are fine, power fets pulse in the power and enable signals, looked for shorts on all power rails and nothing.

 

[2informaticos]

Pins 2 & 4 of U2760 pulsing?
What about PLT_RESET_L?