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Fixing a 'weak' 800 side power supply board

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The title says it.  The board usually works to run a mb, but has dim twin red leds.  It has voltages too high compared to a good board, 9 V dc vs. 5 V dc at a lot of places.
I bought a capacitor checker, but good and weak boards seem to give same farads.  I put the boards next to each other and compare voltages and
capacitance.  I compare voltages with the boards powered up.  I've heard that old capacitors fail.

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