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Yes, bad/weak diodes or leaky caps (c151/c152) would cause excessive ripple before/after L54, and limit the power output, thus the wave seen at L54 would be much higher than 1.5v ptp, and the power supply would be struggling to put out full power.
On the other hand, if it is overloaded, like say over 600ma, then the problem is external, as others have said, don't take the 580ma as gospel, expect -/+ 10%
But the first step, as others have said is to know for sure.
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