XFX 630i (MG-63MI-7109) Fails to power up

[Mad Professor]

Good Day All.

I have a XFX 630i (MG-63MI-7109) that fails to power up.

I am testing this board with good known working PSU, CPU, Memory, ect.

With eveything connected, when you press the power button eveything powers up for a split second, and the PSU led go's from green to red.

If I discount the 4pin CPU power connection, and press the power button the system fires up, but there is no post.

With eveything disconected, I used my Digital Volt Meter to test the 4pin CPU power connection, and it's a dead short.

There are not poped caps or burnt parts.

As it is quite hard to test mosfet's in circuit, I desided to remove all 9 of the CPU mosfet's.

Once I removed all the mosfet's I retested the CPU power connection, and the dead short is no more.

So one or more of the 9 mosfet's had got dead short.

I am trying to find the full datasheets for the mosfet's so I can get somthing that is compatible.

So far this is what I have been able to find out about the mosfet's.

http://products.niko-sem.com/index_e...od_list&cat=24

--------------------------

Part Number: P70N02LDG
Package: TO-252
Configuration: Single
Type: N
VDS (V): 25V
VGS (±V): 20V
VGS(th) max: 3V
ID (A): 65A
RDS(on) mO max @ 4.5v: 15
RDS(on) mO max @ 10v: 8.5
Ciss typ.(pf): 1200
Crss typ.(pf): 350
Qg typ.(nC): 25
Qgd typ.(nC): 10

--------------------------

Part Number: P0903BDG
Package: TO-252
Configuration: Single
Type: N
VDS (V): 25V
VGS (±V): 20V
VGS(th) max: 3V
ID (A): 50A
RDS(on) mO max @ 4.5v: 16
RDS(on) mO max @ 10v: 9.5
Ciss typ.(pf): 1200
Crss typ.(pf): 350
Qg typ.(nC): 25
Qgd typ.(nC): 10

--------------------------

There are also four caps near the mosfet's, and they are Sanyo 1000uf 16v, I am going to replace them as well.

Thanks for your time.

Best Regards.