How to get higher 3.3V rail from Fortron 550W ???

[Stelios]

I just bought a Fortron 550W psu and i'm trying to get a higher 3.3V rail . Inside the PSU are two pots . One for 3.3V and one for the 12V .
The problem with the 3.3V pot is that even if a turn it all the way (zero resistance) the rail can't get over 3.5V.
A friend of mine told me that it is possible to put another resistance in series with the pot , in order to get higher voltages ...:confused:
Anyone knows how will i make it ???? My fried has already done it but i have to go to his place and check it .

I just don't wanna do it with the vsense way .

Thanks !:toast:

[Lithan]

You can (and I have) fry motherboards by giving them too much 3.3. I took one out almost instantly at ~3.75v

And if you're talking about the popular 530fort... there are actually 3 big pots and if I recall right, two little pots. I've no clue what the little pots do, but one of the big ones can take your 3.3 line to at least 3.75v. ;)

[Stelios]

Originally posted by Lithan
You can (and I have) fry motherboards by giving them too much 3.3. I took one out almost instantly at ~3.75v

And if you're talking about the popular 530fort... there are actually 3 big pots and if I recall right, two little pots. I've no clue what the little pots do, but one of the big ones can take your 3.3 line to at least 3.75v. ;)

The 530W is available only in USA. In Europe you can find only the 550W (it has two 12V rails) . The 3.3V pot is already to the Max (3.52V) and i want to go further.

The problem is rather simple , just a voltage divider. All i have to do is to play with the resistors.... :cool:

[Stelios]

I have finally made it ! :D
With the proper resistance , i have set the 3.3V rail to 3.75V

It was so simple ....

[Hell-Fire]

Originally posted by Lithan
You can (and I have) fry motherboards by giving them too much 3.3. I took one out almost instantly at ~3.75v

And if you're talking about the popular 530fort... there are actually 3 big pots and if I recall right, two little pots. I've no clue what the little pots do, but one of the big ones can take your 3.3 line to at least 3.75v. ;)


The smaller pots are for OVP/OCP.

[Stelios]

The 550W doesn't have any overvoltage pots.
Only 2 pots .... one for the 3.3V rail and the other for the 12V(and maybe for the 5V also) .
It's very different to the 530W model.

[Hell-Fire]

Was responding to another post bud.

I would assume that the 5v and 12v rails are tied together. This is generally the case when only one pot is present, or one sense wire.