Question about HP Pavilion a705w PC Desktop
Just to add;
Use a Multimeter. One that is good enough for this application will range from $10 to $12. You can find an economical multimeter in a variety of stores. An auto parts store is but one place. Analog or digital, doesn't matter.
The function knob in the middle of the multimeter is set to the DC Voltage scale.
The DC Voltage symbol is one straight line with a dotted line above it.
(AC Voltage symbol is a curved line. This = No)
If there are different DC Voltage range settings for the Function knob, set it to the 50 Volt scale.
The Positive probe lead is the Red one.
The Negative probe lead is the Black one.
The Positive probe lead touches the Power wire.
The Negative probe lead touches the Ground wire.
Wires coming out of the Power Supply, and their color code:
You will be concerned with three colors of wires.
1) Orange = 3.3 Volts
2) Red = 5 Volts
3) Yellow = 12 Volts
ANY Black wire is a Ground wire.
I suggest you check any unused 4-pin standard Peripheral power cable.
It has one Red wire, (5 Volts), one Yellow wire, (12 Volts), and two Black wires. (Ground wires)
Look like this,
The Positive probe lead tip goes into the socket hole with the Yellow wire, and the Negative probe lead tip goes into a socket hole with a Ground wire.
Read to see if you have 11 to 13 Volts.
Less than 11 volts means it's time to replace the Power Supply.
Same for the Red (5 Volts)
4.5 volts to 5.5 volts indicates okay.
Less than 4.5 volts means replace.
I also found this Multimeter tutorial online just now,
Posted on Sep 14, 2010
Yes the voltmeter measures the voltage.
When you power up the computer to test the voltage on the 4 wire connectors.
Test the voltage red and balck wire should read 5 volts.
Test the voltage yellow an black wire should read 12 volts
If the burning smell is from the power supply then most likely a capacitor has blown in the switch mode power supply.
I would advise you purchase a new power supply, do not try and repair it, these mains devices can be dangerous if you don't have knowledge.
Posted on Sep 14, 2010
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Posted on Jan 02, 2017
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