Question about Acer AL1716 17" LCD Monitor

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Capacitors problem Hi! I would like to know why if capacitor broke then the appliance stop working while we say capacitor is there to store charge. So my question is why the appliance fail to work while the power is there if the capocitor broke?

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  • Anonymous Mar 31, 2008

    NO POWER

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Capacitors have many functions depending upon the circuit. Perhaps the most common circuit where a bad cap will be a major problem is the power supply. Since these store charges, they are used to smooth out the DC current generated from AC power. If there is noise or ripple in the DC current, it can be interpreted as a signal and processed as such. This is just one example. There are hundreds more.
Dan

Posted on Mar 20, 2008

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1 Answer

Monitor wont turn on


Usually the capacitors are 1500uF/25V and 470uF/25V, but I suggest to use 35V capacitors. This will make your power supply to last forever. Also, you better open the monitor and see by yourself what kind are the capacitors. Mind the polarity or the capacitors will blow out with lot of smoke. You can buy them from local parts store like Conrad.com or online.

Apr 07, 2012 | Samsung Computer Monitors

1 Answer

My lg w2043 won't power on


Hello,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.

All these can be checked on the power supply board.

But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps....

Regards.

Apr 23, 2011 | LG W2042TQ-BF 20 inch Monitor

1 Answer

Screen shuts off after 3 seconds


Failing power board capacitors, capacitors store the charge necessary to fire up the monitor, if they leak or blow, the power cannot make a circuit and the screen will shut off

Mar 30, 2011 | BenQ FP731 17" LCD Monitor

1 Answer

When i give power to the moniter the power led blinks fastly in that on/off switch not work led just blinks fastly then its slowly recover after 2/3 min (model 540n sync master) samsung


Hi.
This is a common problem with flay screen tv's.
What is happening is that one or more of the capacitors in your tv are either on the verge of going out, or have went out.
Capacitors act like a jump start, giving a large rush of power all at once to the tv, energizing the screen so that it will properly display the images.
Yours is going slow because most likely one of those are damaged, kinda like an exploded battery.
It might hold SOME charge, but not the full amount, and it won't discharge it's load as properly as a good capacitor would.
First, I would look at the power supply, where the cord plugs into the tv.
Start at that point, and look for bulging, split, cracked, blown, or exploded, yes, exploded capacitors.
If the capacitors are shot, they will almost always leak the capacitance gel inside, it will look wet around the capacitor that's affected.

Also, look at the circuit boards, to see if there are any unusual burn spots, as these also are a good indication of failed components.

The damaged capacitors can be just about anywhere on the circuits, not just by the power supply, you will probably have to look on the main circuit board as well as the convergence circuit.


Just remember to watch out, the capacitors that are still good may have a significant residual charge left in them.

I hope this helps you to find out what is wrong.

Feb 09, 2011 | Samsung Computer Monitors

1 Answer

I have to hold the power on button down for several minutes to get the monitor to turn on, it attempts to but only for a split second.


Capacitors failing to hold charge, pressing the power button allows flow of current to the capacitors on the power board, which are then leaking the current rather than "storing" it, there is therefore insufficient charge to power the inverter with the jiuce it needs to light the screen.

Check capacitors for bulging or leaking ( better still get someone who is comptent to do it) . remember do not touch capacitors until 24 hours after powering off, as the can still retain a charge

Feb 07, 2011 | Scanport H21 21" LCD Display Monitor

1 Answer

Hi, i have a samsung T220HD , its working for 10 months and then the power on button just wont works , the led flashes up , and dies how can i solve this ? help will be greatfull thx !


Bad capacitors are a very common problem. They're like buckets that fill up and store energy so other parts have power to do their jobs. When the capacitors go bad they don't charge or a very slow to charge, and this can be your trouble. This site addresses his exact problem on your model, so you can see if self-repair is something you'd like to try. Good luck, and thanks for using Fixya!

Jan 06, 2011 | Samsung T220HD LCD Monitor

1 Answer

My acer x223w lcd monitor is flickering. When I change the resolution to 800 x 600 it stops. I have updated the driver and tried uninstalling and reinstalling.


hi, have you checked running the monitor on all the outputs? dvi? vga? flickering is caused most times by bad connections either in the video cable, or on the video board, or power board inside the monitor. i know those monitors pretty well, i'm willing to bet if you opened up the monitor and looked at the power supply board, you would probably find worn/blown capacitors. this could very well account for the flickering. electrolytic capacitors store power for parts of the circuit that require lots of power to run. when they go bad(overheat) they pop up at the top, sometimes leak a little fluid. they are replaceable, need to be soldered in, and you can find them at most electronic stores abundantly, but you should check everything else first, the video cables(dvi,vga) before opening the monitor.

Apr 28, 2010 | Acer 22" X223w LCD Monitor

1 Answer

Crt monitor has decreased width at mid portion. Top & bottom width ok.


your monitor has alot of electrolytic capacitors inside it.

they typically have a life expextancy of 3 to 5 years ( depending on the temperature in which they operate )

your montor has bad capacitors


if you know about the HighVoltage that is stored in the CRTube itself acting like a capacitor...... and know how to safley discharge the tube and keep it shorted with a clip lead so it doesn't re-establish a charge... which it will..... Great !

If not
do not attempt repair

OK you may not have to disconnect the tubes HV wire to replace the caps...

but you get the picture,
you can get killed or hurt if you dont know what you are doing...

in what is required to fix your monitor.


replace the bad electrolytic caps
they have developed high ESR
Equivalant..SeriesResistance and you can buy a meter to find these bad caps in your monitor.

cap esr meter

good luck

Jun 16, 2009 | Computer Monitors

1 Answer

I have the same problem. It won't turn on unless it feels like it LOL.


I fixed it! It's the power supply board.

The Westinghouse LCM 22w2 has bad capacitors on the yellow power supply board. This is a common problem plaguing motherboards and LCD flatpanels that use capacitors from Taiwan. If you know how to solder, or know somebody that can, it's actually a pretty easy fix. Take out the yellow circuit board on the inside, write down the specifications for each of the capacitors (the cylindrical things) go to the electronics supply store and get the replacement capacitors. You can go over the voltage specification (not under), but keep the capacitance value matching. Replace one at a time. Go to www.badcaps.net for advice, tutorials and training on doing this. *You really should replace all the capacitors*, but the very large one next to the power plug I did leave on the board because I couldn't find a match. To my delight, it was working as new!

I saved a ton of money fixing this, it's definitely worth learning how to solder to do this.

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Apr 01, 2009 | Westinghouse 22" Widescreen LCD Flat Panel...

2 Answers

Sceptre LCD - no display


It may be the capacitors, since capacitors run about $1.50 or so depending on size you may spend a little over $6 total if you already have soldering equipment or a friend with skills.

Feb 27, 2009 | Computer Monitors

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