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post #21 of 35
CapXons always blow

If there are any bad caps on that board those are likely them.
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post #22 of 35
Thread Starter 
I put the monitor back together and it is working fine so we'll see how long that can last. I'll be back if it quits again. Thanks for all your help guys.

Edit: Thanks for the warning on those CapXons, they will be top of the suspect list next time.
    
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post #23 of 35
Thread Starter 
Bad news; this morning my monitor refused to turn on again. It was working fine yesterday. Because of this I am assuming it was the week of inactivity that fixed my monitor. Where should I start?
    
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post #24 of 35
I don't like that it makes noise before startup, I have never hear a cap make any noise besides pop/bang. I was thinking that perhaps the caps aren't blown but have drifted in there values. I never enjoy blindly replacing components, but that might be the best option for now.

How old is this thing anyway?


What is the brand, farad value, voltage rating and dimensions of each cap circled? Is the one question marked a cap? The 'win' cap is a good capacitor.


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post #25 of 35
Thread Starter 
Wow. Thanks for putting so much effort into helping me. Some of those caps are hard to read but I'll do my best and get back to you with the findings. I think the monitor was bought in 2004 lol.

Also, I live in an area that uses 230V mains power. I have been running the monitor on 230V for the last couple of years. When it first died it refused to work with 230V but showed the symptoms I described in the OP when run on a 110V transformer. I should have mentioned this before but it somehow slipped my mind. Thanks again for all your help.
    
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post #26 of 35
Thread Starter 
Yes there is a cap in the question circle. It is an OST, 10uF, 50V cap.

Top left circle:
Left cap:
OST
4.7uF
50V
Right cap:
CapXon
220uF
25V

Bottom left circle:
The two bigger ones:
OST
1000uF
25V
Small one farther out:
OST
4.7uF
50V
Left medium sized one:
OST
70uF
16V
Right medium sized one:
OST
70uF
25V

Bottom center circle:
OST
Can't see the rest as it is too close to other things (not for lack of trying though)
I can see the number 0332 on the other side. There is also the letters RLS right below that.

Hope this helps.
    
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post #27 of 35
What luck! googled OST capacitors and found a thread talking about them, looks like they might actually fail and not show signs on the outside! http://www.badcaps.net/forum/showthread.php?t=540

We still need to know what series these are. This is why I need to finish that tutorial of mine, so that others can find the correct capacitors for themselves. I did find a spec sheet on ost caps but I don't know if it is the right series. http://www.ost.com.tw/PDF/EC/RLP.pdf

From there we match the dimensions and find the ESR (impedance) and the ripple. The new capacitors should have these same ratings for esr and ripple as the old ones (or close enough) - This doesn't matter as much for monitor power boards, but it is the correct way of doing it. It really starts to matter for things like motherboards and power supplies.

Anyway, any other markings on the caps? What about the "(m)" on the side?

It is still completely possible that something else is still wrong with the board, but this is a great start. The capacitors shouldn't cost too much and if you already have a soldering iron than the only thing put on the line to waste is time.

edit: Excellent on the rls! This is the spreedsheet we need to figure that capacitor, it is likely that the others are the same, but please let me know what they are! http://www.ost.com.tw/PDF/EC/RLS.pdf
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post #28 of 35
Thread Starter 
Looks like all the OST ones are RLS. I will start looking for somewhere around here where I can buy capacitors.

EDIT: I see no "m" on any of the caps. What is it supposed to mean?
    
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post #29 of 35
Quote:
Originally Posted by Mattshewster View Post
Looks like all the OST ones are RLS. I will start looking for somewhere around here where I can buy capacitors.

EDIT: I see no "m" on any of the caps. What is it supposed to mean?
The 'm' was the only marking I saw on the RLP series besides the farad and voltage ratings. So if you couldn't see any other markings than it had to be them. http://www.ost.com.tw/PDF/EC/RLP.pdf

There are three places I've found to be good capacitor dealers:
www.badcaps.com
www.Digikey.com
Mouser.com

Here are some more places but I avoid going to these because they might be selling knock-offs
www.ebay.com
www.amazon.com
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post #30 of 35
I second Digikey.com It gives all the stats on the caps.
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