820-00239 Has 20V but current is cycling

[2informaticos]

Check which secondary voltages pulse; all S4/3/0 states.
Also check all rails in page 78, Power FETs.

Try to start in SMC bypass too.

R3509/39 open could cause an issue on 5V_S4 power rail.
Compare diode mode to ground on PPBUS_G3H and L3500.

 

[bjf]

Had a short on 3V3_S4, just had to hunting for it. Finally found it on C4202. Good to go now. Thanks for the help.