3.1v on CPU socket Pin 2

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t120r
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Joined: Sat Nov 02, 2019 9:30 pm

3.1v on CPU socket Pin 2

Post by t120r » Sat Nov 02, 2019 9:56 pm

So I was doing the tests ad I'm getting 3.1v on pin 2 of the cpu socket (CPU not installed). This doesn't make sense as it's a straight run to pin 1 according to the schematic.

jbelanger
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Re: 3.1v on CPU socket Pin 2

Post by jbelanger » Thu Nov 07, 2019 10:47 pm

You're not reading the schematic correctly as pin 1 and pin 2 are not connected together.

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t120r
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Joined: Sat Nov 02, 2019 9:30 pm

Re: 3.1v on CPU socket Pin 2

Post by t120r » Fri Nov 08, 2019 12:25 am

What I had was the following voltages on the CPU socket: Pin 1 = 3.29v, Pin 2 = 3.10v, Pin 3 = 3.29v. What I found was the board was shorted in this area. I'm not sure how, but I must have overheated it. According to the schematic, Pin 2 should not be connected to anything, just goes to pin 1 of the BDM header.

jbelanger
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Re: 3.1v on CPU socket Pin 2

Post by jbelanger » Fri Nov 08, 2019 1:24 am

Is it possible that you have too much solder which has shorted pin 2 to either one of the other pins on the socket? It's easy to see on the bottom of the board but pretty much impossible to see if that happens under the socket.

You might want to try to use solder wick to remove some solder on pin 2 but be careful not to overheat the board. It's not a big deal if you lose connection between the BDM header and pin 2 so heating that pad should not be an issue.

You can try to see if you have a problem when you put the CPU in place. The worse that could happen is that it won't give you an RPM output. If that's the case and you can't get anywhere with solder wick, you can always bend pin 2 on the CPU just enough so that it doesn't go in the socket. That will have the same effect as no connection.

Jean
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t120r
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Re: 3.1v on CPU socket Pin 2

Post by t120r » Fri Nov 08, 2019 11:51 pm

Thanks for the suggestions. I'm going to pick up some solder wick.

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