Initially you can visually inspect the power board for shorted caps by looking for bulges or swelling at the top. If you can physically see an issue with the caps, then they can be sourced out and replaced using the UF rating as well as operating voltage.
Beyond this, if you have access to a multimeter you can further diagnose.
Take your meter and set it to DC voltage, place the positive probe on every connector that states a voltage (ex: 12VDC, or 12V B+), and place the negative probe to the panel, which will yield the best ground point. Turn the set "ON" and see if the required voltage is present at the VS, VA, V-scan, (which can be verified by the physical label on the board itself).
Additionally, if a voltage is not present on a board, then remove each board from the power supply to make sure they do not have a short which is keeping down the voltage from registering.
If you don't the required voltage (or at least a close reading), Then set the multi-meter to "OHMS" and follow the same procedure to ensure that no voltage is shorted to ground.
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