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Old 11-15-2009, 09:53 AM   #1
badcaps128
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Default Dell 22" LCD display black out. E228WFPC

Hi all,

I am trying to recap del 22" LCD monitor. The symptoms are:

Lcd monitor works fine for first few minutes, then blacks out. I can see the image with flash light thought. Then I unplug and plug back in the power cord of LCD to turn it back ON. After several tries the time decrease from few minutes to seconds. Finally it will turn ON for 2-3 seconds and blacks out. I am not sure if it is inverter or bad capacitors.

By looking at capacitors, I can't notice any bulge or burn signs. I do have fluke DMM with capacitance measurement capability. Not sure how to use it though.

I have added two pictures for you experts out there to give me some suggestions. I do order components from digikey once in a while for hobby electronics and can order recommended capacitors. If someone can circle the picture and let me know what capacitors I need to replace I and go from there on. Or any other advice will be highly appreciated.

Thanks alll for reading.
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Old 11-15-2009, 10:19 AM   #2
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Default Re: Dell 22" LCD display black out. E228WFPC

Hello
This sounds like a possible CCFL failing
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Old 11-15-2009, 10:32 AM   #3
badcaps128
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Default Re: Dell 22" LCD display black out. E228WFPC

Hi Bobdee, Can you suggest any CCFL replacement solution?

Thanks
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Old 11-15-2009, 11:49 AM   #4
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Default Re: Dell 22" LCD display black out. E228WFPC

On second thoughts it might be worth replacing the 2 inverter caps
I recall a Xerox that had a similar problem to this and that was inverter caps
Also I recall a posting about 4-6 wks ago with same problem, (I dont remember outcome) will see if I can find it for you
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Old 11-16-2009, 12:34 AM   #5
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Default Re: Dell 22" LCD display black out. E228WFPC

Quote:
Originally Posted by Bobdee
On second thoughts it might be worth replacing the 2 inverter caps
I recall a Xerox that had a similar problem to this and that was inverter caps
Also I recall a posting about 4-6 wks ago with same problem, (I dont remember outcome) will see if I can find it for you
Post specs of of caps and suggestions can be made with that info. It can be either bad caps or bad CCFLs.
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Old 11-17-2009, 02:52 PM   #6
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Default Re: Dell 22" LCD display black out. E228WFPC

Can someone circle and post my pictures again or indicate where the 2 inverter caps are so that I can post specs?

Thanks all
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Old 11-17-2009, 03:20 PM   #7
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Default Re: Dell 22" LCD display black out. E228WFPC

Quote:
Originally Posted by badcaps128
Can someone circle and post my pictures again or indicate where the 2 inverter caps are so that I can post specs?

Thanks all
The three circled in red are almost certainly in the inverter. I also strongly urge you to replace those circled in green if they are a known bad brand.

PlainBill
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Old 11-17-2009, 05:23 PM   #8
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Default Re: Dell 22" LCD display black out. E228WFPC

Looking at picture in post#1 the caps look like Nippon/United chemi-con KY series
I am not much good at identifying caps but if they are N/UCC caps then they are considered good aren't they???
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Old 11-18-2009, 06:36 AM   #9
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Default Re: Dell 22" LCD display black out. E228WFPC

Quote:
Originally Posted by Bobdee
Looking at picture in post#1 the caps look like Nippon/United chemi-con KY series
I am not much good at identifying caps but if they are N/UCC caps then they are considered good aren't they???
Yes, a very good brand. However, I would want to see the label before making a positive identification.

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Old 11-18-2009, 10:14 AM   #10
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Default Re: Dell 22" LCD display black out. E228WFPC

Ok, here is the brand "Elite" and other info ED(M) 105 deg C (c) 0820 PET

I have marked the capacitance/voltage on the image, please suggest what brand should I replace them with.

Thanks
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Old 11-18-2009, 10:41 AM   #11
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Default Re: Dell 22" LCD display black out. E228WFPC

I just got hold of Fluke DMM from my friend. The device does measure capacitance. Is there anyway I can measure the cap and know if they are okay other than short or open? Do I need to pull out the capacitor from board to measure it? Eventually I will replace all caps but just to learn how to check capacitors...
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Old 11-18-2009, 10:55 AM   #12
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Default Re: Dell 22" LCD display black out. E228WFPC

Elite brand caps are anything but.

The capacitance function on the Fluke meter will not show the ESR of a capacitor. It's pretty much useless for testing. Elite's are junk. Spend the $10 and replace them all.

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Old 11-18-2009, 11:12 AM   #13
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Default Re: Dell 22" LCD display black out. E228WFPC

Quote:
Originally Posted by PlainBill
Elite's are junk. Spend the $10 and replace them all.
I agree. Just a matter of time before they blow.
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Old 11-18-2009, 11:46 AM   #14
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Default Re: Dell 22" LCD display black out. E228WFPC

Quote:
Originally Posted by PlainBill
Elite brand caps are anything but.

The capacitance function on the Fluke meter will not show the ESR of a capacitor. It's pretty much useless for testing. Elite's are junk. Spend the $10 and replace them all.

PlainBill
They are not Elites
Look at post one picture
I have the exact same monitor
I just opened it to confirm
They are Nippon/ucc
If there are Elites I eat my hat and give many appologies LOL
Bob
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Old 11-18-2009, 11:59 AM   #15
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Default Re: Dell 22" LCD display black out. E228WFPC

Quote:
Originally Posted by Bobdee
They are not Elites
Look at post one picture
I have the exact same monitor
I just opened it to confirm
They are Nippon/ucc
If there are Elites I eat my hat and give many appologies LOL
Bob
Ahhh, I'm using a KDS monitor at the moment. This one was built using CapXon caps. But if you open it up you will find Panasonic FMs.

Also, manufacturers will buy their components from whatever supplier offers the best deal. Having worked in Electronics manufacturing, I don't find it at all strange that two monitors of the same model have different brands of caps. Even more so in the age of Just in Time manufacturing.

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Old 11-18-2009, 12:10 PM   #16
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Default Re: Dell 22" LCD display black out. E228WFPC

Quote:
Originally Posted by PlainBill
Ahhh, I'm using a KDS monitor at the moment. This one was built using CapXon caps. But if you open it up you will find Panasonic FMs.

Also, manufacturers will buy their components from whatever supplier offers the best deal. Having worked in Electronics manufacturing, I don't find it at all strange that two monitors of the same model have different brands of caps. Even more so in the age of Just in Time manufacturing.

PlainBill
I am aware that diffrent caps can be used in same monitors as so can the boards I have reaired enough of them, and also read the forum closely
as I said before TAKE A LOOK AT PICTURE IN POST ONE you can see logo and series thats how I first spotted them
There is only one other possibility and that is, he has posted someone elses Picture

Last edited by Bobdee; 11-18-2009 at 12:15 PM..
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Old 11-18-2009, 12:19 PM   #17
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Default Re: Dell 22" LCD display black out. E228WFPC

Hi Bobdee,

I checked them again, they are Elites. I wish I had Nippons like you.
Thanks all for their help. I am going to order all of them from digikey, can anyone suggest any good brand?

Thanks again
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Old 11-18-2009, 12:20 PM   #18
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Default Re: Dell 22" LCD display black out. E228WFPC

BTW this looks very handy equipment for household repairs: Does anyone use it, is it worth it?

http://www.eds-inc.com/cap.html
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Old 11-18-2009, 12:30 PM   #19
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Default Re: Dell 22" LCD display black out. E228WFPC

Quote:
Originally Posted by badcaps128
BTW this looks very handy equipment for household repairs: Does anyone use it, is it worth it?

http://www.eds-inc.com/cap.html
Overpriced IMHO. Look in the test equipment subforum. Two that are attractive are the Bob Parker Blue ESR meter from Anatek and the ESR-Micro V3.1.

I prefer Panasonic FM series caps, but the other 'good' brands mentioned in the 'Frequently Asked Questions' section are also excellent. Just make sure you don't buy ones that are too tall or to wide.

PlainBill
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Old 11-18-2009, 12:37 PM   #20
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Default Re: Dell 22" LCD display black out. E228WFPC

Thanks PlainBill for Panasonic recommendation.

As far as ESR meter is concerned that sounds like a separate thread to find the best one.

Once again, Thanks everyone for your time and suggestions.
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