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Author Topic: One Of The Two Case Fans Stopped Working  (Read 48 times)

bassquake

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One Of The Two Case Fans Stopped Working
« on: July 12, 2007, 10:19:00 AM »
Maybe replace em with Talismoon fans. Do a search, should find it on ebay or the like.
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Zoomy

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One Of The Two Case Fans Stopped Working
« Reply #1 on: July 12, 2007, 12:07:00 PM »
The fans themselves are alrigt. I put them in another xbox 360 and they worked. I figure it's something with the board, but is it something fixable , and if yes how ?
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RDC

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One Of The Two Case Fans Stopped Working
« Reply #2 on: July 12, 2007, 12:44:00 PM »
Are you using any kind of accessory that taps into the rear fan header?

When one fan isn't working it's usually because of this and a Transistor has blown. It's fixable, but only if you know how to remove and install that kind of part. The Transistors for the fans are pretty much just big enough to handle the fan it drives, they're not intended to drive anything else at all.

You'll be doing some soldering to get it working again for sure. DO NOT connect both fans up to the one that is still working either (in case you had that idea) that will just add more strain on the working fan's Transistor and cause it to fail prematurely as well.

The Transistor is a BCP51 or ZT751 (either one will work as a replacement) and are SMT. There is one on each side of the boar right at the fans connector. Top one is for the GPU side fan (Q3A2) and the bottom one is for the CPU side fan (Q3M1).

If you're lucky that's all that was toasted and replacing it will get the fan going again. Alternately you can just cut the Red and Brown wires and run them to some 5v or 12v spot on the motherboard and drive the fans that way. This drives the fans faster and moves more air at 12v, but also make a good deal more noise. The fans run at 5v and are thermally controlled an will run up to 12v if the 360 is too hot or if there is a problem somewhere, so running them from an alternate 5v or 12v source will eliminate the thermally controlled function it has.
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MarutiDriver

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One Of The Two Case Fans Stopped Working
« Reply #3 on: July 12, 2007, 06:46:00 PM »
I've read a lot of times in the forums that the nyko intercooler is a very bad idea.
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G0t M4xx 21

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One Of The Two Case Fans Stopped Working
« Reply #4 on: July 12, 2007, 07:42:00 PM »
I've seen this happen a few times before, the fan transistors blow, but they usually don't take anything else with em, so just replacing the BCP51's fixes it.

I have a whole bunch of em if you need a replacement
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RBJTech

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One Of The Two Case Fans Stopped Working
« Reply #5 on: July 13, 2007, 07:05:00 AM »
QUOTE(G0t M4xx 21 @ Jul 13 2007, 03:18 AM) View Post

I've seen this happen a few times before, the fan transistors blow, but they usually don't take anything else with em, so just replacing the BCP51's fixes it.

I have a whole bunch of em if you need a replacement


.. not sure why they blow tbh - the transistors are rated @ 1A each - the fans are about 200mA each - so plenty of capacity ... weird ...

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