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Technical support / Backlight repair on MD-HMI?
« on: February 09, 2004, 03:35:41 AM »
Is there anything I can try to do myself to troubleshoot the backlight on our MD-HMI? This is the first time I've ever hooked it up but I'm pretty certain I've done it right. I've got the 150 ohm 5W resistor in series with the 24 volt power and connected to the + terminal. Then the other end of the power supply is tied to the - terminal. But no backlight.
The only thing that I can think of that might have caused a failure is that I accidentally left the power supply on when I connected it to the terminal blocks which led to an audible spark. I'm not even sure if something like this is damaging to a circuit but I figured I should mention it.
I'd like to try to see if I can repair it myself since we don't really have time to send the module back before it ships. We can live without the backlight but it'd be nice to get it working.
The only thing that I can think of that might have caused a failure is that I accidentally left the power supply on when I connected it to the terminal blocks which led to an audible spark. I'm not even sure if something like this is damaging to a circuit but I figured I should mention it.
I'd like to try to see if I can repair it myself since we don't really have time to send the module back before it ships. We can live without the backlight but it'd be nice to get it working.