Question about Acer Aspire L100 PC Desktop

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Hello again....i've just discovered within the setup and PC health status that there seems to be a problem with the 12v supply. There are 3 different Voltage meters: 1) 12V 2) 5V 3) 3.3V Alongside these is the actual reading supplied and the 5V and 3.3V show a correct reading, however the 12V supply only shows 0.06V. If fear that this is why the fan isn't working. any ideas???.....HELP

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  • sguler Nov 26, 2009

    thanks for all the info people.

    update time.

    tested the power adapter and it is generating 19V.
    tested the hard drive in another computer and this is working fine.
    i think that there is 3 transformers on the motherboard which convert to the various voltages and i think the 12volt thingy is not working correctly. i've looked on the board and there is 3 little ceramic things with different amount of coils wrapped around....im not expert but imagine the more coils wrapped around means less voltage??

    any ideas on what i can do next??

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Having never repaired, or seen an Acer Aspire L100 desktop, I went to Acer Support, and reviews on the internet. (I do repair computers, however, not just Googling info off of the internet here)

Seems the Acer Aspire L100, uses an external power brick for a power supply. Also looks like they're harder to find than hen's teeth!

It does seem judging by your findings, that your problem is the power supply.
A computer power supply put's out three main voltages, (Such as you have seen)
A.3.3 Volts
B.5 Volts
C.12 Volts

You obviously have a weak 12 volt power rail.
At this point I would take the power brick to a repair shop. I'll bet it's bad Electrolytic Capacitors, but this is just IMHO.

Also read where there are problems with overheating issues. Most post that the front door should be kept open, when using the computer. Better make sure the inside of the computer is clean, as well.

(Computer off, and unplugged from power. Use a can or two, of compressed air for computers.
Pay special attention to the heatsink under the processor fan, and the processor fan.
Do NOT keep constant air pressure on the fan. It is only designed to spin so fast. Spinning it faster than it was designed for, can lead to premature failure of the fan's bearings! {If you hear the fan go 'Zing' get the air pressure away from it!}

BEFORE you reach inside the computer, unplug the power from it. TOUCH the metal frame of the computer case, to relieve your body of static electricity. Static will fry out those delicate computer hardware components. You may not see it, or feel it!
Zap! There goes your computer!

Try to gently move the fan blades by tipping them. Looseness in this area means the fan bearings are shot. Replace fan)

Posted on Nov 19, 2009

  • joecoolvette
    joecoolvette Nov 26, 2009

    This has photos of an Acer Aspire L100 motherboard,

    http://www.ascendtech.us/itemdesc.asp?ic...

    (Scroll down)

    Now, looking at the motherboard. Look at the area behind where you plug Speakers/Microphone in.
    [Orange, Light Green, and Blue ports. DVI monitor connection is below]

    Are you speaking of the choke coil behind it? The round doughnut looking abject with thick copper wire wound around it?

    There is another one behind the blue VGA port.

    If so, I would disregard these for the moment. I would like you to take a look at the Electrolytic Capacitors instead. More specifically the one's surrounding the processor socket.

    Why?
    Because they are Voltage Regulators for the processor.

    This link gives you more in-depth information, about visual failure signs of Electrolytic Capacitors,

    http://www.capacitorlab.com/visible-fail...

    Reason I harp about bad 'Caps' so much?

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


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  • Contributor
  • 47 Answers

Sounds like the power supply is Bad . you can have it tested or get your own tester and test it very simple tool to use.

Posted on Nov 18, 2009

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