ASROCK z590 steel legend

[kjchatman]

i'm troubleshooting this gaming desktop for someone and I don't understand why the cpu voltages aren't showing up when it is powered on. i've changed the cpu, the motherboard and the psu. The LEDs are always on DRAM. I've swapped the four pieces of ram around and still nothing. Wouldn't the cpu voltages show up even without ram?

[kjchatman]

this coil is the only one in the row with a voltage reading. the rest have no voltage

[DynaxSC]

Probably some of the VRM's is faulty, before VCORE is going ON, VCCSA and VCCIO must be provided. Look for VRM's having ENABLE active, but producing no power. Another reason can be faulty power sequence logic or faulty Bios image or even partially faulty SIO or PCH. Look for a power sequence diagram, and diagnoze where the power sequence is interrupted. The power sequence can be from a similar mobo same vendor, they are usually very similar