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Quizshow904 posted:

Polar Express power supplyOne last picture...hope this will help someone figure out my problem.

That power supply looks like a switcher supply which should output the correct 18 volts with or without a load.  Where I volunteered at a computer refurbishing, we had "tons" of those ITE supplies of various voltages and amperages.  Unless they were bad, they were rock solid on output until overloaded and some would "foldback" the voltage to keep from popping parts.

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