Re: How to diagnose a dead PS?

On Jul 22, 8:37 pm, "Bruce." <no...@xxxxxxxxxxx> wrote:
Good suggestion! I tried that but it my PS I can't detect any odor at all.
I hope that isn't a bad sign for my diagnosis. I'll find out tomorrow.

All those tests including smell, paper clip, or the motherboard LED
reports almost nothing. LED says AC power cord is connected. Nothing
more. +5VSB can be completely defective and still that light will
glow.

Nothing identifies something faster than the 3.5 digit multimeter.
In less than a minute, the suspect could have been identified without
shotgunning. Shotgunning: buying a power supply only on
speculation. Did you know about other components of the power supply
'system' - other parts that could have failed?

In your case, meter measures voltage on purple, green, and gray wire
both before and when power button is pressed. What those numbers
report means either you know exactly what is defective OR what to look
at next. Also useful are DC voltage on any one of orange, red, and
yellow wires as power button is pressed.

Normal is for a new power supply to boot a system and still be
defective. Just another reason to have that meter. Once the system
boots, access every peripheral simultaneously - multitask. Then
measure voltages on any one of purple, orange, red, and yellow wires.
Numbers must exceed 3.23, 4.87, and 11.7. If less, a defective power
supply is booting the computer. Meter is also how to identify and
eliminate failures long before the warranty expires. Meter reports
everything that the LED, paper clip, or smell might report - and more
- and faster.
.

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