[SOLVED] CSO - fan staying on

DaveyD
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[SOLVED] CSO - fan staying on

Post by DaveyD » Tue Feb 13, 2018 8:51 am

Hi built my GBZ got it all working but the fan stays on all the time. Temperature is only 51c. Is there something I should have done or is this the normal.

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kite
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Re: Kites circuit Sword fan staying on

Post by kite » Tue Feb 13, 2018 9:07 am

Does the little RED LED next to where you soldered also stay on?

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Re: Kites circuit Sword fan staying on

Post by DaveyD » Tue Feb 13, 2018 9:12 am

Yep that’s on

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Re: Kites circuit Sword fan staying on

Post by kite » Tue Feb 13, 2018 9:22 am

Ok let me take a look on some of my boards this evening and see if it's something silly that I have done.. could you please take a picture of that top corner of the board? Also can you remove the Compute Module and re-insert it?

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Re: Kites circuit Sword fan staying on

Post by DaveyD » Tue Feb 13, 2018 9:59 am

Removed the cm3 and replaced no charge.
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Re: Kites circuit Sword fan staying on

Post by kite » Tue Feb 13, 2018 3:22 pm

Could you remove the CM3 and take a picture of the area around that RED LED (with the board off), i'm interested in the black chip thing with 3 legs. Ideally if you can get the photo nice and bright and in focus :)

PS I've checked my other boards and they work ok so it isn't a software thing

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Re: Kites circuit Sword fan staying on

Post by DaveyD » Wed Feb 14, 2018 3:55 am

Hope this helps
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Re: Kites circuit Sword fan staying on

Post by kite » Wed Feb 14, 2018 4:11 am

Great picture thanks.

In your picture, the resistor R13 ... the right hand side of it.. is is possible to get everything running (booted) and measure the voltage of the RIGHT HAND SIDE or R13? You may need some pointy probes and to scratch the surface a bit (as there is usually a film of sorts on the contacts).

R13 is the resistor on the left of that little cluster of components. R19 is the one right near the edge of the board (not interested in that one)

There is a slight mark on that black chip, does the chip get hot? Did you short the output at any point by accident? Like the solder on the other side of the board could it have touched anything metal?

Lastly (as something for me to think about) how are your soldering skills? Have you ever soldered components that small before? :)

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Re: Kites circuit Sword fan staying on

Post by DaveyD » Wed Feb 14, 2018 6:02 am

Think I’m getting 4v DC. My soldering isn’t the best but I’m getting better. The fan wires are the smalls thing I’ve soldered. I had to desolder them and start again. Don’t know if I shorted anything out but could have. So If you think it’s something I’ve done. That’s ok I can live with fan running all the time. :lol:

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Re: Kites circuit Sword fan staying on

Post by kite » Wed Feb 14, 2018 9:27 am

DaveyD wrote:
Wed Feb 14, 2018 6:02 am
Think I’m getting 4v DC. My soldering isn’t the best but I’m getting better. The fan wires are the smalls thing I’ve soldered. I had to desolder them and start again. Don’t know if I shorted anything out but could have. So If you think it’s something I’ve done. That’s ok I can live with fan running all the time. :lol:
Could you show me how you are testing it? It's expected to be 3.3v

My suspicion is either it shorted momentarily or was defective from the start, and has broken that small 3pin black chip and has conveniently fused itself "ON" .. if the voltage you measure is 3.3v then it's that chip.

You could solder a little wire to that resistor to make it easier to test.. would have to be a very thin one. If it really bothers you you can of course send it in to me and I'll look at it.. i can also tell you the part number of that chip so you can try replacing or if you know someone locally who can help..

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