Question about Acer Aspire L100 PC Desktop

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Could be. Thanks Nick, I find 3 electrolytics with bulged tops: PEC 19 like yours and PECs 15 and 16. None of them has obviously vented but the tops are definitely convex. -clw

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Ok, they're the kiddies to replace, are they all the same manufacturer? all 1000uf 6v3's?

What happens is the electrolyte breaks down and produces hydrogen gas, sometimes they can literaly explode but more often than not they'll either blow out the top or the rubber plug on the bottom and just leak the electrolyte on the PCB.

The electrolyte is corrosive so best to snip the caps out ASAP and clean the board up with a good PCB cleaning solvent before you attempt to replace.

Sorry if your aware of this, dont mean to teach you to **** eggs ;)

Good luck

Nick Sharp

Posted on Aug 21, 2008

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Computer will not turn on how to fix it


I do not have experience with the Acer Aspire 5600U, so I will write about such problems in general. A desktop computer that will not turn on usually has a bad power supply, assuming you've checked the power outlet, power cord to the computer, and the fuse in the power supply. Many computers and monitors built a few years ago have electrolytic capacitors in the power supply that go bad. You can identify a bad capacitor visually. It either leaks or the top of the capacitor is no longer flat but bulges. Desktop computers with bad power supplies commonly have two bad electrolytic capacitors that bulge on top. To fix the problem, you have to be comfortable unsoldering the bad part(s) and soldering in the replacement(s). You also have to be able to identify the specifications of the part(s) you need to replace. A Google search on replacing bad capacitors will give you lots of information, including a number of good YouTube videos. Alternatively, you can buy a replacement power supply.

Apr 03, 2014 | Acer Aspire 5600U all-in-one desktop

1 Answer

For that optiplex 330 can I just put a new Hard Drive?


Sorry, first time I have seen your query.

http://www.fixya.com/support/t16086233-dell_optiplex_330_starts_one_second

Restarting is bad Electrolytic Capacitors on the motherboard.

Radial Aluminum Electrolytic Capacitors to be more specific.

http://capacitorlab.com/visible-failures/index.htm

http://www.youtube.com/watch?v=Lut7MX5Dd_A

May require a bright light for visual inspection.
You're not only looking for the Vent Cover to be bulged up, or popped open, Jay; you are also looking for the Bung to be partially pushed out.
Bung is on the Bottom of the capacitor, so this means if the capacitor is bad, it may be on a hard lean.

What is happening, and why:

Let's start with the basic construction of an Electrolytic Capacitor.

1) Case:
The case is cylindrical in shape, and made of Aluminum. Looks like a miniature Coca-Cola can with the top, and bottom cut out.

The top is sealed with a Vent Cover.
Flat thin disk shaped aluminum 'lid', that has an X or lK etched partway into it.

The bottom is a flat disk also, but composed of synthetic rubber.
This is the BUNG.

2) Internal Components:
There are 3 strip layers inside;

A) One strip is an aluminum metal foil. It is the Conducting Strip.
Has the Positive lead connected to it. (Lead. Think stiff wire)

B) One strip is also made of metal, but has a non-conducting medium applied to it. It is the Non-Conducting Strip.
The Negative lead is attached to it.
Both the Positive and Negative leads poke through the Bung, at the bottom of the capacitor.

C) The last strip is composed of a paper-like material, and is soaked with Electrolytic Paste

The Electrolytic Paste soaked strip is laid in-between the two metal strips, and all three are rolled up tightly.
This is a basic explanation. There are Several of these layers inside an Electrolytic Capacitor.

When an Electrolytic Capacitor starts to go bad, the paste inside (Electrolytic Paste), develops a gas. Hydrogen Gas.
The gas expands inside the case of the capacitor.

When enough pressure has developed, the seals on the capacitot are compromised.
The Vent Cover etched shape breaks open, and/or one side of the Bung pushes out. (This makes the capacitor lean hard to one side)

The Electrolytic Paste begins to ooze out.
So much paste loss, and the capacitor operates in a weakened state.
TOO much paste loss, and the capacitor fails.

A Capacitor is designed to Slowly build up a charge, then release it all at once. This can be seen in some camera flash units, that use capacitors.

Crude explanation, is to imagine a large swimming pool being filled up with a garden hose, then one side of the pool is taken down all at once.

Capacitors are used as Filters, and Voltage Regulators.

The one's used as voltage regulators are in the Motherboard Voltage Regulator Circuit,

Part of what the motherboard voltage regulator circuit does, is to regulate voltage for the Processor.
The Processor (CPU) MUST have a steady, 'clean', supply of Voltage, and it MUST stay within the tight tolerance range for the Processor.
Cannot be too little voltage, or too much.

Processor doesn't receive the correct voltage it turns off. (BIOS turns it off)

Weak capacitor, or capacitors; will regulate the voltage, then break down, and Processor turns off.
Capacitor builds back up again the Processor turns back on.

http://www.youtube.com/watch?v=KN6_-8fYHo0

Starts at 0:04

Solution:

Bad capacitors can be replaced.

Now...........are all bad capacitors going to show visual signs of failure?
Maybe not.
Sometimes the Electrolytic Paste dries up inside, and no visual outward signs of failure are shown.

HOWEVER..........due to the Capacitor Plague, and the fact I have done this repair on SEVERAL motherboards; it is MHO they can be replaced, and a good motherboard again is the result.

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

What really transpired, but is no longer talked about;
In a large capacitor company, in a large country; there was espionage.
A gentleman was fired from the company. In retribution a female co-worker decided to steal the companies Electrolytic Paste formula. A HIGHLY guarded secret.

She took the formula to a neighboring country, where they used the formula, and produced 1000's upon 1000's of capacitors.
(Looking back now it must have been millions)

Unknown to her the company had caught wind of what was going on, and before she grabbed the formula, they gave her a bogus formula instead.
The formula did not have the correct ingredients, to keep the Electrolytic Paste from developing gas.

These capacitors are STILL affecting us TODAY!
(From I believe the early 70's)
All electronic units that use Electrolytic Capacitors can be affected, not just personal computers.

This is why I believe there is a high rate, of replacing the bad capacitors, and the motherboard will work again.

A) http://www.hardwaresecrets.com/article/595

B) http://www.youtube.com/watch?v=YCSNWi3UHf4

C) http://www.mouser.com/Search/Refine.aspx?N=12013592

Capacitors used on your motherboard are rated in Microfarads.
Symbol is uF.
Let's use a 470uf capacitor at 16 Volts, for an example,

Under the Capacitance heading, scroll down. Click on 470uF
Under the Voltage heading scroll down, click on 16 V.
Under the Termination style click on -> Radial

Leave all the other fields ALONE.

At the left side there is an -> Apply Filters, and there is one to the far right side also, under the chart.
Click on Apply Filters.

This is what you get,

http://www.mouser.com/Passive-Components/Capacitors/Aluminum-Electrolytic-Capacitors/Aluminum-Electrolytic-Capacitors-Leaded/_/N-75hqw?P=1z0wrk5Z1z0x565Z1z0z7l5

Scroll down a little.

The only thing you are concerned with now, is the size of the capacitor.
Case Diameter, and Case Length.

If it states General Purpose Electrolytic Capacitors, don't sweat it.
They ARE computer grade, I assure you.

Need advice in de-soldering, and soldering? Just post back in a Comment. I'm your man.

For additional questions please post in a Comment.
Regards,
joecoolvette


Jan 19, 2013 | Computers & Internet

1 Answer

Output comes then decrease the output


That's because the Electrolytic Capacitors inside the SMPS are breaking down.

Specifically Radial Aluminum Electrolytic Capacitors.

A Capacitor slowly builds up a charge, then releases it all at once.
(Although it happens in milliseconds. Millionths of a second)

Think of a large swimming pool being filled up by a garden hose, then one wall is taken down all at once.

Capacitors are used in flash units for cameras. (Slowly being phased out)

The basic construction of a Radial Aluminum Electrolytic Capacitor, is;

A) Outside case: Thin aluminum. Like a Coca-Cola can with the top, and bottom cut out.

B) Top: Thin aluminum flat disk. Has a lK or X shape etched partway into it.
This is the Vent Cover.

C) Bottom: Thin flat synthetic rubber disk. The Positive and Negative lead pokes through it.
This is the Bung.

D) There are three strips inside. (Basic construction)
1) One strip is of foil thin metal, and has the Positive lead connected to it.
This is the Conducting strip.

2) One strip is also thin foil metal, but has a non-conducting medium applied to it. It has the Negative lead connected to it.
This is the Non-Conducting strip.

3) The last strip is a paper-like medium, and is soaked with Electrolytic Paste.

The paper-like strip is laid in-between the two metal strips, and all three are rolled up tightly.
There are many layers of this construction inside the capacitor.

When the capacitor starts to fail, it's because the Electrolytic Paste inside is developing gas. Hydrogen Gas.
The gas expands inside the capacitor's case, and the build-up of pressure eventually compromises the seals.

Either breaks the lK or X shape open in the Vent Cover at the top, or pushes one side of the rubber-like Bung down.
Electrolytic Paste starts oozing out.

So much paste loss, and the capacitor operates in a weakened state. Too much paste loss, and the capacitor fails.

Capacitors are used as Filters inside the Switched- Mode Power Supply,

http://en.wikipedia.org/wiki/File:ATX_power_supply_interior-1000px_transparent.png

http://capacitorlab.com/visible-failures/index.htm

This is NOT an invite to open the Power Supply, and attempt repair.

Regards,
joecoolvette

Dec 07, 2012 | Computers & Internet

1 Answer

Machine will not boot up shuts down after 5 secs


My question is have you checked the Electrolytic Capacitors on the motherboard? THOROUGHLY checked them.
(Motherboard out in hand, good lighting, and perhaps a magnifying glass)
If the Power Supply voltages are 3.3 Volts. 5 Volts, and 12 Volts, the capacitors on the motherboard are next in the diagnoses.

[ What was the Voltages, by the way? ]

Electrolytic Capacitors are used as Filters, and Voltage Regulators, on the motherboard.
The ones used as voltage regulators are in the Motherboard Voltage Regulator Circuit.

Part of what the motherboard voltage regulator does, is to regulate voltage for the Processor.

The Processor must have a steady, 'clean', supply of Voltage, and it MUST stay within a tight tolerance range.
Too little, or too much, and the Processor turns off. (BIOS turns it off)

{Capacitors in the motherboard voltage regulator circuit, that regulate voltage for the Processor, are in a Series circuit. If just ONE goes bad, the circuit is down }

An Electrolytic Capacitor used on motherboards, and in Power Supply's, for personal computers, is a Radial Aluminum Electrolytic Capacitor.

Radial refers to the design. With the radial design the leads, (2), both come out of the same end,

http://www.panasonic.com/industrial/electronic-components/capacitive-products/leaded-electrolytic.aspx

Basic construction of an Electrolytic Capacitor is;

1) An outside case (Shell) that resembles an aluminum Coca-Cola can, with no top, or bottom.

2) The top cover is a Vented Cover. Flat aluminum thin disk with a shape etched partway into it. The shape is usually an X or K.

3) The bottom cover is a Bung. A synthetic rubber disk shaped piece, that has the two leads coming through it. (Positive and Negative lead. Lead.......think stiff wire )

4) There are three strips inside the capacitor's case.

A) Conducting Strip. Also known as the Positive strip.
A thin strip of metal aluminum foil, that has the Positive lead connected to it.

B) Non-Conducting Strip. Also known as the Negative strip.
A thin strip of metal aluminum foil also, but has a non-conducting medium applied to it.
The Negative lead attaches to it.

C) A paper-like strip soaked with Electrolytic Paste.

The paper-like paste soaked strip, is laid in-between the two metal foil strips, and all three are rolled up tightly.

Point?
Computer design engineers know that Electrolytic Capacitors will eventually fail. They are the weakest link. They slowly fail because the paste is a chemical. The chemical breaks down.

For this reason, the engineers use capacitors that are rated at twice of what is needed.
As the capacitor breaks down to what is 50 percent of it's capacitance, it is still 100 percent good, as far as what is needed for that circuit.

When an Electrolytic Capacitor breaks down, it is the paste inside that is breaking down.
The paste develops a gas, (Hydrogen Gas), and the gas pushes against the seals, at the Top, and Bottom.
(Vented Cover at Top, Bung at Bottom)

The seals may then be compromised.
1) The X or K, at the top in the Vented Cover, may break open, and paste will slowly ooze out.

2) The edge around the disk shaped Vented Cover may break open, and paste may slowly ooze out.

3) The synthetic rubber disk shaped Bung at the bottom, may have one edge slightly pushed out, (Usually makes the capacitor tilt on the motherboard), and paste will ooze out.

So much paste loss, and the capacitor operates at a weakened state.
Too much paste loss, and the capacitor fails.

A) http://www.hardwaresecrets.com/article/616

B) http://www.hardwaresecrets.com/article/How-to-Identify-Japanese-Electrolytic-Capacitors/595

C) http://www.mouser.com/Passive-Components/Capacitors/Aluminum-Electrolytic-Capacitors/Aluminum-Electrolytic-Capacitors-Leaded/_/N-75hqw/

D) http://www.youtube.com/watch?v=KN6_-8fYHo0

(Starts at 0:04)

Post in a Comment as to your findings Antony, and if the 'caps' are good, we'll go on.

Regards,
joecoolvette

Jan 08, 2012 | Packard Bell iMedia Computers & Internet

2 Answers

Tower won't turn on


The Electrolytic Capacitors that I'm referring to are on the motherboard. More specifically, it is the one's which comprise the Voltage Regulator Circuit on the motherboard, that I would like you to pay special attention to.

To test at this point, we are just going to do a visual test.

I believe the following information from me, is helpful when proceeding with a visual test for bad capacitors.
I will also include a link, which has photos of bad capacitors on a motherboard, and more information.

The Electrolytic Capacitors look like small aluminum pop cans.
In fact, the outside case is a small aluminum can.

The 'can' shape is a round tubular shape, with two flat shapes that seal each end, that resemble lids.

The top shape is a flat metal disk, and has a cut etched partially through it. The cut is typically shaped like an X, or a K.
This is a Vent.

The bottom of the 'Can' is sealed with a flat disk shape also. Typically made out of a rubber like substance.
This seal is referred to as a Bung.

Inside the 'Can' are Three thin strips wound together tightly.

One strip is metal, and is the Conducting strip.
It is also the Positive connection for the capacitor.
It has a Lead attached to it. ( Wire or Pin)
The Lead protrudes through the rubbery Bung, on the bottom of the capacitor.

One strip is metal, and has a non-conductive material applied to it.
This is the Non-Conducting strip. It is the Negative connection for the capacitor.
It too, has a lead that protrudes through the Bung, on the bottom of the capacitor.

(Basic example: http://en.wikipedia.org/wiki/File:Capacitors_electrolytic.jpg

The Electrolytic Capacitor on the bottom of the photo, that has Radial leads, is what I'm referencing to)

In-between the Conducting strip, and the Non-conducting strip is a strip of paper soaked with an Electrolytic paste.
The three strips are rolled up tightly together, and inserted in the aluminum can, with the leads protruding through the Bung.

When the Electrolytic paste starts to go bad, it develops a gas. (Hydrogen gas)
This gas swells inside the capacitor's aluminum case, and can make the case bulge.

The gas can also push the Electrolytic paste out of the capacitor, usually in a slow ooze.
It will break open the X or K shape at the top, or come out around the edge of the flat disk shape.

It can also push the rubbery Bung out at the bottom of the capacitor.
Usually just pushes one side out.
This makes the capacitor lean to one side, as the Bung is touching the motherboard, and pushing up on the capacitor.

So you are looking to see if the aluminum can case is bulging, and/or also if Electrolytic paste is oozing out of the top, or bottom of the capacitor.
It is typically a yellowish/brown, or just brownish.

This is Visual Signs of Bad Capacitors,

http://www.capacitorlab.com/visible-failures/index.htm

One part of the Voltage Regulator Circuit handles voltage for the Processor.
A Processor must have a 'Clean', steady supply of DC voltage, and it must be kept within a tight tolerance range.

Processors have a tight tolerance range, and will shut off if the voltage is too low, or two high. (BIOS turns the Processor off)

The Electrolytic Capacitors used for the Processor, typically surround the Processor, but may be located away from the immediate are also.

This gives more information on the motherboard Voltage Regulator Circuit,

http://www.hardwaresecrets.com/article/616

You have to use a flashlight, and a magnifying glass sometimes. It may also require removal of the motherboard so that a close inspection can be done.

Would like to hear the result of your findings.

Feb 11, 2010 | Compaq Presario S4000NX (DF213AR) PC...

2 Answers

Changing out electrolytics on my Acer Aspire L100


and good eyesite i hope... those boards are soldered by machine in a factory controlled by a computer (of course).
Be that as it may... determine the values of the capacitors. it's written on the side of the case. Not one side has a strip. in other words negative and positive side. ensure you get them in the same way they came out.
Finding the parts depends on where you live. i would suggest seeing if you can find a donour motherboard that you can remove them from. inspect the part first... if it is rounded on the top it's not what you want.

next is desoldering the part. don't try using a 100 watt soldering iron as you will do serious damage. mount the board on it's side with the parts closest to you that you want to desolder... a solder wick or solder ****** is your best bet as it makes for a cleaner job.
determine which two solder points hold in the part. heat them and pull (gently) up on the part. replace the capacitor making sure the orientation is proper and resolder it. careful not to heat it up to much. inspect the solder job to ensure you did not create any solder bridges to other components on the board.

do one at a time so you don't lose track of what you are doing and the orientation of the parts.

I applaud you for attempting this as i see too many things thrown out nowadays that can be repaired.

I repaired an lcd monitor with a $2.00 part and it works great.

back to the board. finish all the parts.... inspect it carefully again for solder bridges. reassemble it ... power it up ... hold your breath and watch for smoke.... if you do the job carefully you will enjoy the results.

Robert

Please rate this solution ... thanks

oh and let me know how you made out later

Aug 27, 2008 | Acer Aspire L100 PC Desktop

1 Answer

3.3 seems ok


Carl,

does the hard drive spin up? if not it may indicate the fan is on the 5V rail and not the 12V rail.

P013 definately doesn't appear correct and i would guess is the problem component.

Ive tryed googling for the part but not turned up any hits im afraid.

From what I recall the 12V rail needs to be able to source 5A so if you can find a pin compatible device you may be able to replace it as it doesnt look like the original device is easy to find.

You never know you may well find the same device on that old mobo of yours :)

Would be glad to know if you make any further progress.

Regards

Nick


Aug 25, 2008 | Acer Aspire L100 PC Desktop

1 Answer

Testing the motherboard


Hi there,

The failed caps have obviously vented at some point as it was swollen and an obious doming was present on the top of the cap.

I have inspected the other failed machine which Acer refused to repair alongside some other kit ive had fail recently and they all have the same rated cap failed.

Ive since found this article which could be the root of the problem with the acers.

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

As I said earlier what I found with mine upon applying power I heard a faint click from the piezo buzzer and the LAN LED flashes once.

Hope this is of help, if you need any more dont hesitate to ask.

Regards

Nick Sharp


Aug 21, 2008 | Acer Aspire L100 PC Desktop

1 Answer

No boot up screen


Hello.

The mother Board is a possibility, but I think that first I would check the main power supply. It is best to substitute in a known good PS to verify. If a good power supply fails to correct. I would look on the mother board for obvious hot spots or electrolytic capacitors with bulging tops or shrunken PVC outer coverings. Manufacturers have built with defective or incorrectly marked capacitors before. I have repaired several by just replacing the caps that had overheated and started to vent pressure after doming their tops.

Good luck.

Oct 15, 2007 | Acer Aspire T310 PC Desktop

1 Answer

Dell OptiPlex GX270 PC Desktop Problem


Dell did confess that it had some problems with the products it rolled out. http://www.news.com/Bulging-capacitors-haunt-Dell/2100-1003_3-5924742.html If you think your motherboard has the same problem as bulging capacitors. then you can call them and get it replaced. you are eligible for that. Thanks Ashish

Sep 22, 2007 | Dell OptiPlex GX270 PC Desktop

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