I do not want to start soldering on the ez-b if im not entirely sure this is going to fix the problem.

restating the problem and test-results:

If i connect power to the ez-b, nothing happens: the leds do not light up, and i cannot connect to it from ARC. The fuse is fine and there seem to be no loose connections/soldering errors. (the loose regulator i spoke of is actually connected properly, its just the heat sink thats not entirely stuck in place. Still it might be that the regulator got damaged?) The part from the diagnostics video where you measure 5V is only giving 1.3 or so volts. But the servo ports all have 5V on them.

So: after 2:20 in the diagnostic video, my lights do not turn on. At 2:45 in the diagnostic video, you measure 4.96 Volts, but i only get 1.3.

Could it be that the firmware got corrupted? Apparently it gets power, but just wont start up... Thank you for all the replies at least, but i still haven't found the problem.

Have you tried wiggling the loose part while power is applied to the EZ-B ?

Yes i have.

Without re-soldering loose joints further troubleshooting is futile.

@ Robot-Doc, I am convinced there is nothing wrong with the soldering. One of the heat sinks is a tiny bit loose on its metal pin, but that pin is perfectly well connected to the board. This makes me able to bend the three connections of the regulator a little bit, but this is as well connected perfectly to the board. Forget i even said there was something loose.

Any thoughts on the 1.3V instead of 5V in diagnostics: what does that mean? what can be the cause of that? Can it be firmware related that the board refuses to start up or something?

Thanks for the further explanation of the term "loose". At this point you should contact support and share your voltage measurements with them.

I had a similar issue with the center pin on one of my EZ boards but it was a poor solder joint. Also it never had a power issue just a loose heat sink mounting.

If you are getting .6 volts on the regulator, here is what i do first ,remove the chip from the board and dont bent the pins and check if you get 3.3 volts

If you dont the regulator is bad,or not grounded or bad filter cap

same with 1.3 volts try it too,1.3 volts is the reference volt of the regulator it meens may be gound is off

I design circuits like that.

Also, when i got my stuff in, my green power connector was flaky. I had to replace it. It was making and breaking. BrandNew , but defective. I am sure that D.J. will make this unit good if defective.