OS DC not powering up

[robm]

All,

I’ve had a Opensprinkler DC for a few years now, and a month ago the switch mode power supply (12v) died, so i installed a new power supply. Then a week later, the system does not boot. So i tried another power supply, which is producing 12V when not plugged into the OS board, however as soon as i plug it in, i can only measure 0.7V DV at the pins of the power input plug – obviously it does not power up with this voltage.

So there appears to be a component that is killing the power supply – would it be worth replacing the 7805 voltage regulator? Or any other ideas for what might be the issue.

Thanks

Rob

[Ray]

Which hardware version is this controller?

[robm]

Version 3.0

[robm]

Here is a pic

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[Ray]

You can replace the 7805 regulator and see if it works. It may have overheated and broken down.

[Author]

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