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Tomboy
14-01-2009, 03:57 PM
I have acquired a Mercury MH17JS 17 inch LCD monitor. These use an external power supply, which is 12V 3.3A. What I want to know is if anyone can confirm that the centre pin on the power supply lead is the positive line?
Commonsense says the centre pin is normally positive, but I don't want to blow this up.
Thanks for any help.

bob_doe_nz
14-01-2009, 04:21 PM
Either grab a multimetre and check the voltage or check the cord or socket. Quite often there is a diagram indicating the polarity

Tomboy
14-01-2009, 05:17 PM
Thanks, but the monitor is not marked for polarity, and I don't have the original power supply unit.

bob_doe_nz
14-01-2009, 07:20 PM
What about trying a Dick Smith 12 Volt Adaptor?

I know some models did have a polarity setting/plug.

If it does not work, you can return it.

Agent_24
14-01-2009, 09:00 PM
Take a multimeter or continuity tester and connect one end to the monitor's chassis or other common ground connection (you may need to take the back off)

Then find out which pin of the power socket goes straight to this.. and that will be your negative side

Ofthesea
14-01-2009, 09:37 PM
You could try asking the manufacturer, presumably www.mercury-pc.com
- you never know, they might help.