Need help DCLCD 19" LCD Monitor - I already replaced caps
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
Well I had no intention of killing this thread but it looks like I did a very good job.
It sounds like you may unfamiliar with some of your volt ohm meter readings, And I was just trying to suggest maybe you confused milivolts with volts and ohms with k ohms or m ohms.
You said that you were seeing 5v on one pin of the logic board so to me it sounded like that dual diode was working.
I was really hoping someone would answer if there is a good way to test these.
I guess one good thing is the diode is probably not very costly, And sometimes you may have to install a known part to rule it out.
There was a question about the ohm reading you get when you connect the leads of the volt ohm meter together.
Try another set of leads see if you get closer to 0ohms.
.I really wish I could help more but I am trying to learn also.
Al.Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!Comment
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
post #46 and #58 have not been yet answered by wenter. Hard to help when wenter won't or can't provide the information.--- begin sig file ---
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There are 10 kind of people in this world: those that understand binary, and those who don't.- ASUS ROG Maximus IX Code
- Intel Core i5-7600K 3.8GHz
- 16gb GSKILL TridentZ RGB DDR4-3200
- 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
- Windows 10 Pro x64
- GeForce GT1050
2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job)
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There are 10 kind of people in this world: those that understand binary, and those who don't.- ASUS ROG Maximus IX Code
- Intel Core i5-7600K 3.8GHz
- 16gb GSKILL TridentZ RGB DDR4-3200
- 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
- Windows 10 Pro x64
- GeForce GT1050
2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job)
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
Cant not remove back of monitor after removing all screws and baseall:
I have two dclcd 19" lcd monitors and one of them died a few months back. I was going to throw it out, but i decided to try to fix it. I did some research online and found that the capacitors are typically the problem, so that is why i am here.
The first thing i did was switch out the entire inverter board for the one in my monitor which already works. Once the working inverter board was put in, the broken monitor worked again - i therefore know the problem is on this board somewhere!.
The board is loaded with elite caps which i guess can go bad.
I ordered 5 caps from digikey (all exact voltage, uf specs as the ones i replaced) in hope that it would be on of the 5 larger caps. I swapped them in with no luck. I then got determined and swapped the other caps between my working and broken board. The board which was originally working still works, and the broken one is still broken.
i swapped all of the caps with the red x's on it.
What else should i do? I'm out of time today, but maybe you guys can give me some guidance
i have more pictures if they are needed
thanks,
martiniComment
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
https://www.badcaps.net/forum/showpo...84&postcount=2--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
I had problem with my similar DCLCD 19" monitor, anyway, I scavenged 2 capacitors (TEC, 16V, 1000uF) from a bad power supplies, test them out, and the monitor is work like new, the color is vivid.
Symptoms:Monitor began color shifting a while back(a year ago), greenish mostly, I didn't bother fix it, until it die out on me yesterday, open her up, find bad brand capacitors all in, didn't bother replacing all of them, just these 2 popped(CapXon, 16V 1000uF). anyway, I have been using it for like about 4 years. now it is like new, just want to share my experience, hoping it will help other. Great site though.Last edited by number22; 12-22-2010, 10:31 AM.Comment
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
There are 10 kind of people in this world: those that understand binary, and those who don't.- ASUS ROG Maximus IX Code
- Intel Core i5-7600K 3.8GHz
- 16gb GSKILL TridentZ RGB DDR4-3200
- 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
- Windows 10 Pro x64
- GeForce GT1050
2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job)
Comment
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
Ok, I have the same issue. Turns on for a second, then goes out. I put a DMM on several points on the board. But what seemed strange was the right side terminals of the circled piece (AC connection to the left) kept flashing my Fluke from 4.xxV - 5.xxV, then to OL and back. On the DMM on the left I was getting -80 Volts. Is the where the AC is suppose to be converted to DCV? If so, this could be the failed part. What type of part is it? #4G P721F 4GRLast edited by DJM_PHX; 12-23-2010, 11:39 AM.Comment
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
If you hookup a computer displaying your favorite wallpaper, do you still see it by shining a flashlight onto the screen? Also, does the power LED stay green/blue?
I put a DMM on several points on the board.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
I used an LED flashlight and see nothing. Tried this before.
The LED was a solid blue before then would start blinking, now it does not come on at all.
Also, why do I see a -80V on the top of the large cap and a -84V and a -85V on the leads? All voltage measurements are pulsing just as I see it from the opto isolator.
thanksComment
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
2) You are using the incorrect GND if you are getting negative voltages. To test the large cap, put your multimeter on 200V DC (if manual). Put your black probe on the negative leg and red probe on the positive leg. If you have 120V main voltage, the big cap should read 120 x 1.414 or roughly 160V to 165V DC. It should be a stable voltage. CAREFUL, this is high voltage.
3) The pulsing voltage is a clue. The small cap lying on its side just right of the big cap could be bad without bloating. That cap is critical to the SMPS startup process. So if you do not see any secondary voltages from #1, this small cap could be the culprit.
4) Can we clear and focused picture of YOUR board? Reusing other people's pictures (especially without telling us) doesn't help us diagnose YOUR problem. Your board could have unique characteristics not shown in someone else's photo. It is not uncommon for manufacturers to make changes on their boards. Also try to get the resolution as close to 2000x2000 as possible.Last edited by retiredcaps; 12-23-2010, 01:44 PM.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
I agree.That little guy has given me some trouble in the past.And is ofter overlooked.There are 10 kind of people in this world: those that understand binary, and those who don't.- ASUS ROG Maximus IX Code
- Intel Core i5-7600K 3.8GHz
- 16gb GSKILL TridentZ RGB DDR4-3200
- 1 M2 SSD + 2 WD Blue 1TB (Mirrored)
- Windows 10 Pro x64
- GeForce GT1050
2 x Acer KA240H + 1 Vewsonic VP2130 21 (a cap replacement job)
Comment
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Re: Need help DCLCD 19" LCD Monitor - I already replaced caps
1) If the power LED does not come on at all, measure the all the pins on the connector (just right of the optoisolator). Use a ground screw for the black probe. The red probe goes to each pin. Put your multimeter on 20V DC. List, measure, and record each pin. You are looking for DC voltage. At minimum, you should see 5V DC on one of the pins.
2) Brn 0V
3) Red 0V
4) Org 0V
5) Yel 0-0.04V
6) Red 0-0.04V
7) Blk 0-0.04V
8) Yel 0V
9) Gry 3.5V
10) Wht ~0.002V
11) Blk 0V
12) Brn 0V
13) MT
14) Red 0-0.04V
15) Org 0-0.04V
2) You are using the incorrect GND if you are getting negative voltages. To test the large cap, put your multimeter on 200V DC (if manual). Put your black probe on the negative leg and red probe on the positive leg. If you have 120V main voltage, the big cap should read 120 x 1.414 or roughly 160V to 165V DC. It should be a stable voltage. CAREFUL, this is high voltage.
4) Can we clear and focused picture of YOUR board? Reusing other people's pictures (especially without telling us) doesn't help us diagnose YOUR problem. Your board could have unique characteristics not shown in someone else's photo. It is not uncommon for manufacturers to make changes on their boards. Also try to get the resolution as close to 2000x2000 as possible.
I have gone over the other pic and it is like mine, but I will follow up with the pic.
Number off of the board: LM004 Rev J 12/01/2003Comment
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