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Repair MotherBoard?

T

TaranScorp

Senior member
I made a mistake, I dug up the MB out of my basement to put in a case and noticed that it is the SYS_Fan1 header that is blown Not the CPU_FAN header.
There was a solder lead that connected from the fan header to the PCIe-1 connector. It melted under the soldermask and is exposed now and only a copper lead shows and is fraggled looking.
Why is the fan header connected to the PCIe slot with a solder lead?
Nothing on the back of the board is fried.

I blew the CPU fan header on a Gigabyte board and you know that before boot up the bios checks to see if the fan is working before booting up so I can't bypass the fan and no boot up.
I read on the internet about a guy that did the exact same thing and he replaced one transistor and got his board working again, but he didn't bother to mention which chip he replaced🙁
Anyway to find out which chip it could be or anyone fix boards for cheap?
 
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TaranScorp said:
I blew the CPU fan header on a Gigabyte board and you know that before boot up the bios checks to see if the fan is working before booting up so I can't bypass the fan and no boot up.
I read on the internet about a guy that did the exact same thing and he replaced one transistor and got his board working again, but he didn't bother to mention which chip he replaced🙁
Anyway to find out which chip it could be or anyone fix boards for cheap?
Click to expand...

You most likely will need to replace the mosfet transistor, the three legged piece.
It might be a pita to remove and might be hot glued underneath the the transistor.
Can you take a close up of the fan head and mosfet to see if we can see any damage?
 
Something like this.
480.1221.jpg
 
Can you take the status wire from a fan, and then wire that in so that power for the fan is coming from another header or directly from the power supply but the fan speed status wire comes from the fan and goes to the blown header? So then the motherboard would know the fan was spinning, even with the supply from the header blown?

With a bit of creative wire wrapping (just wrap or tape the status wire to the pin temporarily, or find a volunteer to hold the wire) you could test this idea out without soldering anything, and then if it works, then you could solder something more permanent.
 
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I would find some way to attach the fan PWM wire to the board and just power teh fan from teh PSU. That sucks that your board makes you have a fan spinning in order to work.
 
Tomorrow I'll try to take some close up pics.
Does anybody maybe know someone that could take a look at the board and see if it's worth repairing?
 
SpeedTester said:
Something like this.
480.1221.jpg
Click to expand...

heh only if the fan is a 500W+ blower 😀

more like this:




there may be a way around this, take the wire for the rpm sensor and attach it to the dead header, attach the + and - leads to a good header and try to boot it. it's unlikely that you've blown the sense terminal.

edit: whoops, that's what pm suggested
 
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I will try the rewiring idea. All I have to do is put the board in a case and hook everything back up to it again. I blew the header about six months ago and since then have built a whole new system for just encoding and photo work. I want this board for internet cruising. I am using a dell 8300 for now but it only has 2MB of ram and a P4 3.2 chip.
 
TaranScorp said:
I will try the rewiring idea. All I have to do is put the board in a case and hook everything back up to it again. I blew the header about six months ago and since then have built a whole new system for just encoding and photo work. I want this board for internet cruising. I am using a dell 8300 for now but it only has 2MB of ram and a P4 3.2 chip.
Click to expand...

I think if you can find an old tv repair guy he could get you going for very cheap. I've done all the caps before on a dual socket board and that took some time but worked great for years.

I don't think that 2mb of ram is going to do so great on the p4 ;-)
 
I made a mistake, I dug up the MB out of my basement to put in a case and noticed that it is the SYS_Fan1 header that is blown Not the CPU_FAN header.
There was a solder lead that connected from the fan header to the PCIe-1 connector. It melted under the soldermask and is exposed now and only a copper lead shows and is fraggled looking.
Why is the fan header connected to the PCIe slot with a solder lead?
Nothing on the back of the board is fried.
 
TaranScorp said:
Why is the fan header connected to the PCIe slot with a solder lead?
Nothing on the back of the board is fried.
Click to expand...

It is not connected to PCIe slot.
The copper lead pass under the PCIe slot or going to an inner layer through vias.

What is your mobo part no?
Please give detailed photo with more components near of SYS_Fan1 header.
 
I'm just going to scrap this mobo, I was just going to use for internet cruising anyway. I dug up a old Asrock 4CoreDual-SATA2 board that will do great for internet cruising🙂
 
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