Did I fry something?

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03-06-2011, 11:11 AM

skidude

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Did I fry something?

MS3 and MS3X, home-built, with all the help of this thread.

Here's the problem: While testing the alternator circuit, I didn't remove the daughterboards, and now I can't get the MS to do anything. When I plug it into the computer, it recognizes the USB-serial converter, but I get no response at all from the MS, either on the stim or in the car.

It worked before I started (except the alternator circuit), but now it does not. I don't know where to start trying to figure out what's wrong. I've got 5v at all the proper pins on the main board when connected to the stim.

03-06-2011, 12:38 PM

y8s

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you did load firmware?

03-06-2011, 01:32 PM

skidude

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I didn't load any new firmware, just the stuff that was on there before. I'll try reloading firmware.

03-06-2011, 01:39 PM

Ben

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If you built it, then you have to load firmware.

In fact, you're supposed to load firmware during the build in order to stim test I/O.

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03-06-2011, 01:42 PM

skidude

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Well, I loaded firmware on it once, but it's possible I somehow erased it, right?

03-06-2011, 01:52 PM

skidude

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I tried loading the firmware again, and it gets hung up "Attempting Wakeup".

03-06-2011, 09:05 PM

skidude

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I'm out of ideas. I have no idea how to test a board I didn't build when it won't connect to the computer. Does anybody have any suggestions on how to determine which board the problem may be on? I can only assume I fried something by applying too many volts, but I just hope I only fried one thing instead of all three or something.

03-07-2011, 03:53 AM

Reverant

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I'm pretty sure you can find the problem, if you have an oscilloscope. Just find the MS3 schematics, which are freely availabl...oh wait.

03-07-2011, 05:26 AM

skidude

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Quote:

Originally Posted by Reverant

I'm pretty sure you can find the problem, if you have an oscilloscope. Just find the MS3 schematics, which are freely availabl...oh wait.

I don't have an oscilloscope anyway.

03-07-2011, 08:36 AM

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Braineack

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Its very possible you could have fried the CPU on the daughterboard. I've done it twice to my MS3.

03-07-2011, 10:22 AM

#11

skidude

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What are the symptoms of that? And is the only repair option a new ms3 board for $200?

03-07-2011, 09:37 PM

#12

skidude

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Well, I bought a new MS3 board, hopefully that fixes the problem. Of course I had to fry the most expensive part.

03-07-2011, 10:29 PM

#13

y8s

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might have been cheaper to ship it to DIY and let them test it.

03-08-2011, 08:23 AM

#14

Ben

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Or better, ship it to Peter Florance to let him repair it.

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Buy an MSPNP Pro, you'll feel better.

03-08-2011, 09:04 AM

#15

Braineack

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Yeah Peter charged around $90 the second time around IIRC. Now that he knows what happens when they fry. First time was just under the cost of the MS3 due to all the diagnostics.