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I've just finished building my OTGW, but is does not seem to work.
I followed the troubleshooting steps for the website and I have no voltage (1mV) on X1 and pins 5 and 14 of IC1 give 6,2 volts instead of 5v.

What could be wrong?

Update on this,
When I connect the gateway to the computer using usb, I can upload firmware to the PIC

If you have no voltage on X1, then there's probably a bad connection on R7, R11, Q2, or X1. It's also possible that Q2 is the wrong component or that it is broken.

A Vcc voltage reading that is too high has been discussed on this forum before. Please look at the information provided in those topics.

Thanks for pointing me in the right direction.

First I replace Q2, but without succes, after that I also replace Q3.
Now X1 give 24v and 5,9mA

Right. My reasoning was that if you only have the components I mentioned, you should already have some voltage on X1. But a short circuit on Q3 could "throw soot in the food" and create the same result.