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Old 05-16-2006, 09:30 PM   #1
Fox5
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Default Help identifying bad caps in a monitor.

Hello, I picked up a broken Monivision CRT monitor, and apparently this particular brand of monitor has a problem with bad capacitors. I'm just wondering how to identify which ones.

1. I'm assuming ones with brown stuff leaking out from them are bad.
2. What about the ones with white stuff leaking out? Is the white stuff actually leaking out, or just some kind of paste or something that was sloppily applied? The primary ones covered in the white paste are the largest capacitors in the set (ack, I knew what they did at one point in time, can't remember anymore though), but there are a few smaller capacitors that are kind of glued together by it, though not in any meaningful way. Just looks gooped along the top of the two.
3. Is it possible other things than capacitors could have problems? There's some coil thing that's covered in the brown stuff, but I suppose that's problem from a blown capacitor spewing its guts.
4. Should I assume that any capacitors that aren't flush with the board are blown? There are quite a few tiny ones that aren't flush, but their leads are so long it doesn't apepar they would have gotten that way from being blown, just that they were put on that way.
5. In order to remove the power boards from the set, I'm going to have to desolder some wires. Most of them are just grounds, but there are a few that appear to be power cables soldered directly to the boards (though I could be wrong and they may just be more grounds), any problems I might run into by desoldering these?

Thanks for any help and advice you guys can give.

Last edited by Fox5; 05-16-2006 at 09:33 PM..
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Old 05-16-2006, 10:11 PM   #2
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Default Re: Help identifying bad caps in a monitor.

Ok, I'm pretty sure all of the aforementioend wires that are soldered directly onto the circuit boards are just grounds. The primary one I was concerned with (because it runs to some hidden area inside the tv) splits off from the video feed, so I'm fairly certain it's just a ground like the others.

The main concern I have right now is what is the white paste at the bottom and on the sides of some of the caps?
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Old 05-16-2006, 10:11 PM   #3
Galvanized
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Default Re: Help identifying bad caps in a monitor.

Read the safety section here http://www.repairfaq.org/sam/crtfaq.htm

On our home page just above forums is identifying bad caps w/pics.

The heavy white stuff is probably silicone.

Can you post pics?
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Old 05-16-2006, 11:43 PM   #4
Fox5
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Default Re: Help identifying bad caps in a monitor.

Quote:
Originally Posted by Galvanized
Read the safety section here http://www.repairfaq.org/sam/crtfaq.htm

On our home page just above forums is identifying bad caps w/pics.

The heavy white stuff is probably silicone.

Can you post pics?
I don't have a camera on hand, but I'll try to get back with some pictures.
Where would the silicone have come from? Would it have leaked out from the caps (insulating material perhaps?) or does it have some purpose?
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Old 05-18-2006, 02:38 PM   #5
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Default Re: Help identifying bad caps in a monitor.

Ok, after taking a look around inside the tv, assuming that the silicone is nothing bad, I found and removed the two obviously bad parts, and niether one was a capacitor.

One that was horribly blown was a transformer. The other part which seemed to be leaking, though I'm not entirely sure about, is an inductor. Any ideas on how I could identify these? The inductor has a label on top of it (200-0332-60033 C.E.I. 0222) but I have no idea how to identify it form that. The transformer does not have a stick on top, though it appears to have had one at some point in time. I'm guessing maybe it melted off or something. The only identifying mark on the transformer is a white stripe down the side of the rubber casing.
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Old 05-18-2006, 03:15 PM   #6
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Default Re: Help identifying bad caps in a monitor.

Here's a picture of the transformer and the smaller inductor. The transformer is about 1" tall.
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File Type: jpg PICT0003.JPG (147.1 KB, 83 views)
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Old 08-11-2006, 04:42 PM   #7
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Default Re: Help identifying bad caps in a monitor.

That where really blurry that picture cant you try to take another photo that are little better ?
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