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Permalink Reply by Sonny on August 25, 2011 at 8:58pm

Any ideas?

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Permalink Reply by Toby Mills on August 25, 2011 at 9:28pm

I did the same thing, I shorted positive to ground accidentally.

I tried to get help here but nobody could really offer many suggestions. I did a lot of diagnosis and analysis and found that my IMU was fine but my main board had blown the PPM chip.

I ended up ordering a new main board from the store which USPS then lost.
I finally ended up ordering a new main board from a local supplier as I couldn't wait for the USPS service to finally get back to me. That was over a month ago, still waiting.

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Permalink Reply by Sonny on August 25, 2011 at 9:34pm

Thanks Toby. At least I know I'm not the only one. I ordered replacement boards already which worked well. I tried to do the mega first, since it was the cheapest. What was strange is that it would work with an FTDI cable, but the bottom got so hot that it could blister your hand. With the oilpan on top, it would hang at the command prompt and never return. With the new mega, it didn't get hot, but the command prompt still did not return. I also got very few lights on the mega when connected with the old oilpan. With both replaced, its working. But I would like to fix the old ones to install on a different type of machine. Do you happen to have a blog or something that you logged your diagnostic steps to?

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Permalink Reply by Greg Fletcher on August 25, 2011 at 9:38pm

How did you reverse power the board, from the servo rail? If it was the battery input you may have fried the voltage regulator. If the servo rail then i don't think it would do anything. What do you mean it partially works. Is the power fried or not. You did look at the schematic, didn't you? !!!

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