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Well I don't know how much you know about electronics; but this is a good place to start learning by troubleshooting it and finding why it doesn't work. Not many parts on the board to deal with.
7 times out of 10, you will probably find that the switch is bad. But you can also trace thru the board and make sure the solder joints are good. Buy a switch if all else fails and replace it. Probably uses a SPDT mini switch. About ~$1.
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