Question about HP Pavilion a705w PC Desktop

2 Answers

When my computer starts the power light will blink and the fan starts. When the computer first had problems it froze and the fan turned on and wouldnt stop. I also smelt a burnt rubber smell. I read to test the power supply with a tester, is that a voltmeter you are refering to?

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  • add37j Oct 30, 2010

    I only asked about the voltmeter scale because when i have a problem i want to be a meticulous as i can in explaining it, so it is known exactly what the problem.
    I havent gotten around to checking the power supply yet, I have been busy @ work.
    I believe what you listed is the processor i have. I did clean the top of the processor and the case. I did not, However use anti static precautions, I knew nothing of it.

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2 Answers

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  • HP Master
  • 5,660 Answers

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,

http://www.playtool.com/pages/psuconnectors/connectors.html#peripheral

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,

http://www.ladyada.net/learn/multimeter/voltage.html

Posted on Sep 14, 2010

  • 2 more comments 
  • add37j Sep 23, 2010

    I thought originally it was the processor. Took out old processor and end up buying the wrong on 1. The I got answers from this site. I put the processor back in with new heat sync on it. I plugged computer in. The Light is Yellow. Both fans start. Compouter will not power down, it has to be unplugged. I checked one of the peripheral cables, the DVD/CD Player. It tested at
    11.95 yellow/ black and 5.14 red/black. Checked at 20 and 200 DCV. I dont have a 50 Volt setting. Would I also check the main cable coming out of the power supply?

  • joecoolvette
    joecoolvette Sep 24, 2010

    1) Sorry, 20 Volt scale, 50 Volt scale, whatever applies. (Different multimeter's have different settings for the Function Knob)

    2) Yes, check the 3.3 Voltage power rail, by checking in your 20-pin ATX main power cable.

    http://www.playtool.com/pages/psuconnect...

    http://h10025.www1.hp.com/ewfrf/wc/docum...

    Scrolling down the page, the motherboard illustration lists the 20-pin ATX main power cable's connector on the motherboard, as Conn 1.

    Referring back to the PlayTool link above, test any Orange wire, (3.3 Volt), with the main power cable plugged into the motherboard, as shown in the photo to the far right.

    See if your multimeter probe will go down into a socket hole with an Orange wire.
    (Right next to the wire, and down into the socket hole)

    NOTE*
    At the END of every wire, going down into the back of the main power cable's connector, is a metal terminal.
    The probe lead must touch that metal terminal. (Female. Plugs onto a pin coming out of the motherboards main power cable connector)

    The insulation of each power wire, goes down into the main power cable's connector (Socket hole) pretty far. The probe of the multimeter must touch the metal terminal at the end of the wire.

    The Positive (Red) probe lead of the multimeter to an Orange wire, the Negative (Black) probe lead to any Ground wire. (Ground wires = Black. Not to be confusing, but Ground is also Negative)


    3) Does your Pavilion a705w have the base Processor?
    The Intel Celeron D, model 340, at 2.93GHz? (Socket 478)

    http://en.wikipedia.org/wiki/List_of_int...

    (Part Number RK80546RE077256)

    As you can see in the Wikipedia link, the Intel Celeron D model 340, runs on 1.25 to 1.40 Volts.
    It could be the 3.3 Volt power rail, (Orange wire) is the power rail providing power for the Processor.

    May I also ask if you have been following Anti-Static Precautions, and how you applied the fresh, new thermal paste, (Also known as Thermal Grease), to the top of the Processor's case?

    A Processor is the Most susceptible hardware component to Static shock.

    Did you thoroughly clean the top of the Processor's case before applying thermal paste?
    Use Q-tips dipped in Isopropyl Alcohol? (Also known as Rubbing Alcohol)

    [CAUTION!
    Isopropyl Alcohol is Extremely Flammable!
    Use in a Well ventilated area, with No sparks, or flames present ]

    Is the Socket 478 bracket on the motherboard in good shape?
    The new Heatsink is locked securely into it?
    Heatsink is sitting flat? There is no perceptible light showing in-between the top of the Processor's case, and the bottom of the Heatsink?
    (I remove the motherboard, and get a 'birds-eye' view across the side of the motherboard, for this)

  • add37j Oct 30, 2010

    I brought up the voltmeter scale because I want to explain everything.
    I have not gotten around to checking the power supply yet, I have been very busy at work .
    I do believe that processor you listed is the one I have. I did clean the processor and the bottom of the fan, w/ alcohol. I did not however, use anti-static precaution's, I knew nothing of it. I also spread the grease with my finger. A few of the pins on the processor were bent, so I tried to bend them back. I think it did sit flat and tight in the socket.
    I thank you for your time and knowledge.

    John

  • joecoolvette
    joecoolvette Oct 30, 2010

    I use a mechanical pencil, ('EverSharp') to straighten Processor pins. A Processor is the most susceptible computer hardware component to Static shock, and was touched by your fingers. How about a Celeron D 325 (2.53GHz) for $14?http://www.weirdstuff.com/cgi-bin/catego... (Not advertising. I've used these guys before, and have always received good working parts)

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  • HP Master
  • 32,281 Answers

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

  • add37j Sep 23, 2010

    I thought originally it was the processor. Took out old processor and end up buying the wrong on 1. The I got answers from this site. I put the processor back in with new heat sync on it. I plugged computer in. The Light is Yellow. Both fans start. Compouter will not power down, it has to be unplugged. I checked one of the peripheral cables, the DVD/CD Player. It tested at
    11.95 yellow/ black and 5.14 red/black. Checked at 20 and 200 DCV. I dont have a 50 Volt setting. Would I also check the main cable coming out of the power supply?

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