Fan header question.

[Actionpie42]

I have an old system I dug out and started to work with. The problem is with a couple of fan headers no longer working but I think I have a potential fix for it, but I wanted to run it by a few people first. I should state that otherwise the board is working fine.

 

When I used a multimeter to check for continuity between the 12v+pin where the atx cable plugs in and the 12v pin for the working fan headers i have it but when I troubleshoot the broken plugs I don't as I expect.

 

If I know for a fact the short was in the fans plugged in those headers and not something else on the board, can I just go direct wire from the 12v pin on the backside to restore power to those slots? I'm just good enough at soldering to do it right but that is how this works right?

 

Thanks

 

 

[RONOTHAN##]

31 minutes ago, Actionpie42 said:

can I just go direct wire from the 12v pin on the backside to restore power to those slots?

In theory, but the fans would only work in PWM mode (depending on the age of the board, that's a decent chance it doesn't support PWM) or would run at full speed. If it's full speed, you might as well just get a molex/sata to fan header and use that instead, no real reason to do the soldering. 

 

Odds are if a component died, it would be the actual voltage regulator for the fan headers, so if you're going to fix it with a soldering iron, do it the right way and replace the actual voltage regulator instead of trying to directly wire the +12V with +12V. 

 

37 minutes ago, Actionpie42 said:

If I know for a fact the short was in the fans plugged in those headers and not something else on the board

If it was a short, you wouldn't want to fix it like this. A short means that there's power going where it shouldn't go, in which case you want to figure out where it's going that it shouldn't be going, not trying to connect around it. What I think you mean is a trace break. 

[Actionpie42]

39 minutes ago, RONOTHAN## said:

In theory, but the fans would only work in PWM mode (depending on the age of the board, that's a decent chance it doesn't support PWM) or would run at full speed. If it's full speed, you might as well just get a molex/sata to fan header and use that instead, no real reason to do the soldering. 

 

Odds are if a component died, it would be the actual voltage regulator for the fan headers, so if you're going to fix it with a soldering iron, do it the right way and replace the actual voltage regulator instead of trying to directly wire the +12V with +12V. 

 

If it was a short, you wouldn't want to fix it like this. A short means that there's power going where it shouldn't go, in which case you want to figure out where it's going that it shouldn't be going, not trying to connect around it. What I think you mean is a trace break. 

You're probably right about that. A trace break sounds more like what I was thinking. How do I find the voltage regulator in that case?

[RONOTHAN##]

6 minutes ago, Actionpie42 said:

You're probably right about that. A trace break sounds more like what I was thinking. How do I find the voltage regulator in that case?

What motherboard are you using and what fan headers are dead on it? It will be a small black square next to the fan headers, and it should hopefully have model numbers printed on it so you know what to order from somewhere like DigiKey. 

[Biohazard777]

May I suggest a simpler solution?
You have at least one fully functional fan header, right? Just buy a powered fan hub and connect your fans to that.

[Actionpie42]

4 minutes ago, Biohazard777 said:

May I suggest a simpler solution?
You have at least one fully functional fan header, right? Just buy a powered fan hub and connect your fans to that.

I know about those. this is such an old board it was more of an excuse to try fixing something like this. Built in 2010

[Actionpie42]

10 minutes ago, RONOTHAN## said:

What motherboard are you using and what fan headers are dead on it? It will be a small black square next to the fan headers, and it should hopefully have model numbers printed on it so you know what to order from somewhere like DigiKey. 

m5a99fx pro r2.0 pretty old now actually. And I believe the it's the cpu fan and cpu opt that are out. 

[RONOTHAN##]

6 minutes ago, Actionpie42 said:

m5a99fx pro r2.0 pretty old now actually. And I believe the it's the cpu fan and cpu opt that are out. 

It should be these:

 

I can't make out what they say from the photo on Newegg, but you should hopefully be able to google the part model and figure it out. 

[Actionpie42]

21 minutes ago, RONOTHAN## said:

It should be these:

 

I can't make out what they say from the photo on Newegg, but you should hopefully be able to google the part model and figure it out. 

I'll have a look at those shortly thanks

[leclod]

This might be stupid, but have you tried to set those headers in the bios ?

DC/PWM (if PWM is available) Fan curve or at least different modes

[Actionpie42]

7 minutes ago, leclod said:

This might be stupid, but have you tried to set those headers in the bios ?

DC/PWM (if PWM is available) Fan curve or at least different modes

They're not turned off or anything in thr bios I was there when it went down. Ground wire came lose of the pump and briefly touched the 12v side