XBOX 1.6 Power Supply problem

Alright, so the XBOX I've been modding all month, it's power supply has stopped working.
When plugging the cord in I can hear a crackle (which is normal for all XBOX systems I own). So I know power is working through the board (I think). When I get closer to the Power Supply I can hear a little ticking sound near the large capacitors. At first I thought the Power Supply was shorting on the shielding, but even without the shielding it's still doing the same thing.
So now the system isn't turning on at all, I've tried another switch board thinking that could be the problem too, but that's ruled out as I got the same result.

It's really odd, as the system was working fine last night. It was plugged in as well over night. I believe the fuse has blown or burnt out, but not really sure what the problem could be. There was no smoke, or popping sounds. A new power supply would set me back $40, and that's more than a bare system is worth... Any ideas?

Just some images of the board, should help find out the problem:

 

No body knows the issue?

 

What readings do you get from the lines when checking with a meter?

 

Don't have a meter yet. Not sure if it would help but, I hear ticking sounds from the transformer. Not the large caps, would that mean the transformer is dead or shorting?

 

The "a little ticking sound near the large capacitors" is probably generated by too much current being drawn from the standby power supply. Since it's protection circuit keeps cutting then re-starting as the protection circuit capacitor discharges you get that "tick tick tick" sound.

The "cackle" is normal and it happens when the main capacitor charges and the oscillator circuit for the standby power supply starts up.

It's possible that you have a short circuit on the main board. Try disconnecting the power supply from the main board then apply mains voltage to it, check if that "little ticking sound" keeps happening. If you power the PSU up without the main board and the odd sound disappears, have the main board inspected throughly.

Mainly the area close that Xyclops chip (around the LPC port)...

 

Thanks Oliveria. Well I've disconnected the power from the main board. The ticking sound is a bit louder now, I'm guessing it's the power supply now at the moment.

After doing more research on 1.6 no power up, the resistor you're talking about could also be causing this, I've looked over the board and there is nothing really jumping out at me, no burnt marks or bulging caps.
What could be causing this?

 

Not every electrical problem is visible to the naked eye. To properly diagnose, you'll need to test each line and find the fault.

 

You happen to have another 1.6 box ? Have the white console motherboard tested with another PSU and if that works, then the PSU has damage.

 

incorrect info removed, see below

 

Not on hand no. On Sunday hopefully I can get a 1.6 locally.

@Bad

Doesn't the 1.2 PSU plug require the wires to be changed around? They are in different locations on the ATX plug if I'm not mistaken.

 

Wrong. 1.6 use a completely different power supply which only works for it.

It has a single 5v rail which is aways on and acts as standby voltage.

All earlier types used 3.3v as standby voltage.

And using 5v as standby voltage is why 1.6 consoles had that 3.3v regulator onboard which could fry in case of short circuits while installing a modchip.

 

I actually knew that too, but replied from my phone while waiting for parts in RS components.

My bad, and nice catch to you both!

 

I'm a little confused now, is the PSU suppose to tick? It still ticks when it's not connected to the mainboard.

 

It's NOT supposed to tick, that's why I told you to test the motherboard with another PSU.

 

Thanks bro. Just misunderstood what you meant. I need another 1.6 board, hopefully I can find one.