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How is it possible your power supply is faulty multimeter test says acceptable?
Tokyodos2
A multimeter draws next to no current, so will not effectively test the power supply under load.
The voltage on the meter is averaged out and so will not show ripple current, or spurious dips in the supply.
You will need an oscilloscope to check for ripple current (poor smoothing) and the supply needs to be under a load.
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∙ 12y ago
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Why does your 120 outlet measure 49 volts when you test it with a multimeter?
Either the supply or the multimeter is faulty.
You suspect that a power supply is faulty but you use a multimeter to measure its voltage output and find it to be acceptable Why is it still possible that the power supply may be faulty?
Yes, it can be faulty. Some damaged power supplies show good output voltages on the voltage range of a multimeter but, when you connect them, they don't work properly. One possible reason is that maybe an IC in its voltage regulator has a high resistance between the common and the output. You cannot see this by shunting a voltmeter onto it. You have to place a typical load onto the output to test it.
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Yes.
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test it with a multimeter
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A faulty power supply does not supply any power at all to a computer or supplies incorrect voltages. Most of the time faulty power supplies are not serviceable and require replacement.
What tool can you use to troubleshoot power supply issues measure current resistance or voltage?
multimeter
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Either a dead battery - or a faulty power supply.
What is the first step to be taken when you receive a report of a faulty power supply?
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