what controls the 5v standby on this power supply?>

[mattstolte]

I have less then 1 v on this 5v standby on this power supply can anyone guide me what to fix or test to fix it? the fuse is good.
Apex HDAD240W401 (MT40420, 909H1504) Power Supply for LD4088

[budm]

Re: what controls the 5v standby on this power supply?>

The small transformer on the bottom right is the STBY power supply section.
I see 3 small lytics caps to the left of the transformer that you should check or replace. You can try heating them up with hair dryer them apply the power to the board to see if you will get normal Voltage.
The devices on the heatsink to the right are the rectifier diodes that you should also test.