Vanguard won't quit whining!

jbbradley

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Mar 22, 2010
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louisville, Kentucky
Power up the Vanguard, original board, whines for 5 min then stops. High pitched constant sound that doesn't let up till it's done. OK. Thought it was the board or maybe a capacitor on the board so I got another from quarter arcade. Got the new board, same thing. Except I have the added benefit of missing maze walls after it's on for 30 min :( So I check the power supply and I'm getting 6V on the +5v. So I adjust down a bit..garbage on the screen at 5V. Up to 5.5V, everything works fine except the whine never leaves and I've now got a hum bar effect. So, I'm thinking I have a bad switcher maybe. Any ideas?
 
my first guess is that the whining might be the flyback. Although I have heard a switcher whine once. Maybe unplug the monitor and power it up. See if you still hear the whine. If not I'd guess the monitor is the culprit. If you still hear it with the monitor disconnected than I would suspect the PS.
 
Problem solved! I put another switcher in there and all my issues are gone. I guess switcher problems can be misleading. I will definitely remember that. Thanks!!!
 
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