Jon
Premium
join:2001-01-20
Lisle, IL
1 edit | reply to Jon
Re: Good or bad capacitors
Okay!
Got the capacitors and got the old ones off. was actually quite easy. 
Next question cause I want to be sure....
How do I know the polarity? The board is marked. On the capacitor there's a black stripe with what looks like a minus sign but obviously I want to get it right the first time.
Or is it a long wire short wire thing?
This is the new one. (two of them.
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pnjunction
Teksavvy Premium
Premium
join:2008-01-24
Toronto, ON
1 edit | The answer is right in your own first pic...the stripe with the minus signs goes with the filled-in side of the outline.
Nice to have pics so you can know for sure.  |
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Jon
Premium
join:2001-01-20
Lisle, IL | Thanks again!
New ones are in, though my solder job leaves a lot to be desired. Hopefully it's good enough. Time to reassemble this thing and see what happens! |
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Jon
Premium
join:2001-01-20
Lisle, IL
| reply to Jon
Re: Good or bad capacitors [RESOLVED]
Ha Ha! Hell Yeah!
Thanks pnjunction  and everyone else who responded!
That is awesome!
Thanks again everyone!  |
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pnjunction
Teksavvy Premium
Premium
join:2008-01-24
Toronto, ON | Nice work! Not worth getting fixed by a pro, it likely would've been landfill if you hadn't put the work in yourself. |
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Jon
Premium
join:2001-01-20
Lisle, IL
| Thanks. And yeah, I wouldn't even have bothered. Probably would have cost as much as getting a new one. This was a total of about $8 and a few hours of my time.
Sucks that a part that costs a few cents and is (as I now know) pretty easy to replace can turn a $300 TV into trash.  |
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VegasMan
Are We There Yet?
join:2002-11-17
Schaumburg, IL
 ·AT&T Midwest
| said by Jon :Thanks. And yeah, I wouldn't even have bothered. Probably would have cost as much as getting a new one. This was a total of about $8 and a few hours of my time. Sucks that a part that costs a few cents and is (as I now know) pretty easy to replace can turn a $300 TV into trash. Funny thing is so many manufactures use inferior parts these days just for that reason. Built in obsolescence. It was one thing that Mot. was good at avoiding for many years but now unfortunately has fallen into doing. Oh well job security on my end.
--
In need of a Vegas vacation.
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Jon
Premium
join:2001-01-20
Lisle, IL
| said by VegasMan :Funny thing is so many manufactures use inferior parts these days just for that reason. Built in obsolescence. If it was two or three years old it wouldn't be so bad. Would still think it sucks but this one was just about a year old, maybe less. Made in China, guess I should have expected it.  |
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SparkChaser
BURY BECK
Premium
join:2000-06-06
Downingtown, PA | reply to Jon
Good job, Jon! |
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Jon
Premium
join:2001-01-20
Lisle, IL
1 edit | Thanks! And I learned a lot today. I never knew you could "desolder" something. And now I know the striped side (negative) of the capacitors goes with the filled in side of the circle.
Maybe I'll take that $200 I saved and get myself a new toy. |
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srr2
join:2001-12-20
Bethlehem, PA
 ·RCN CABLE
| said by Jon : I know the striped side (negative) of the capacitors goes with the filled in side of the circle. Well... It would be much safer in any future repairs to note the polarity of the existing components. This nomenclature (the filled-in part of the circular sector (What is that actually called?)) isn't a standard. You may find something like that indicating the positive side on someone else's PWB. |
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rawwhide
Zer0
Premium
join:2000-09-03
Zero
clubs:
·AT&T DSL Service
| said by srr2 :said by Jon : I know the striped side (negative) of the capacitors goes with the filled in side of the circle. Well... It would be much safer in any future repairs to note the polarity of the existing components. This nomenclature (the filled-in part of the circular sector (What is that actually called?)) isn't a standard. You may find something like that indicating the positive side on someone else's PWB. Yep. Make sure its clearly marked on the board or mark it yourself from noting the polarity of the existing parts.
--
To talk much and arrive nowhere is the same as climbing a tree to catch a fish. |
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pnjunction
Teksavvy Premium
Premium
join:2008-01-24
Toronto, ON | reply to srr2
If you look at the pics of the bottom of the board there was a '+' sign beside one of the leads for each cap there. |
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public
join:2002-01-19
Santa Clara, CA
·DSL EXTREME
| reply to Jon
said by Jon :Made in China, guess I should have expected it. Just to clarify, the caps you installed will have a short life. Next time buy low ESR caps rated for high ripple current, and 105C max temp.
In small quantities Mouser and Digikey are a convenient, expensive source. |
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Anonymous_
Anonymous
Premium
join:2004-06-21
127.0.0.1
clubs:
·RoadRunner Cable
·Time Warner Cable
 ·Time Warner VOIP
3 edits | reply to Jon
said by Jon :Ha Ha! Hell Yeah! [att=1] Thanks pnjunction and everyone else who responded! That is awesome! Thanks again everyone! my monitor has bad capacitors i just preheat the monitor if i want to turn it on (then leave it on 24/7)
are you willing to fix my monitor ?
other wise this nice monitor will be E-Waste soon
the cheapest i found for a Refurbished Power supply was 80$ not worth it as i can get a new or used LCD for 99.99 |
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An_Onymous
join:2009-10-24
Canada
| reply to public
>Next time buy low ESR caps rated for high ripple current, and 105C max temp.
Also look for capacitors that have a specified lifetime of 10,000 /7000/5000 hours. This is yet another important parameter to look for. If they don't specify it, then it is probably a 2000 hours one or of questionably quality.
The days of selecting capacitors that matches the values are long gone. There are literally 30-40 types of capacitors for different requirements from the same manufacturer. If you don't believe me, take a look at this chart: »nichicon-us.com/english/products···ia_f.htm |
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public
join:2002-01-19
Santa Clara, CA
·DSL EXTREME
| said by An_Onymous :The days of selecting capacitors that matches the values are long gone. There are literally 30-40 types of capacitors for different requirements from the same manufacturer. ???????
The current rating and esr are more important than value. Lifetime depends mostly on operating conditions. Spec is typ life at max ratings for quality caps, not the chinese rejects.
That is why general purpose caps have short life in high ripple current ps use. |
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SparkChaser
BURY BECK
Premium
join:2000-06-06
Downingtown, PA
 ·Verizon FIOS
·Comcast
| reply to An_Onymous
As public said the life is affected a great deal by the actual conditions it is being used.
»www.illinoiscapacitor.com/techce···tors.asp |
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An_Onymous
join:2009-10-24
Canada
|  | 
Cap selection |
I have attached a screen shot of 3 different types of capacitors selected from that chart. Each of them have different L1 values ranging from 7000 Hours vs 5000 hours vs 2000 hours for long life vs low ESR/Ultra low ESR and can sizes.
While you are absolutely correct to select capacitor for low ESR and high ripple values for the switch mode supply, you cannot ignore the endurance! If you go on the Digikey website, you'll see the column of Lifetime @ temp column as part of the selection criteria. That column exists for a reason!
Note:
The voltage derating factor does not apply for small electrolytic caps. They are for the big cans.
Low ESR usually implies high ripple current as it is the I^2*R heating effects that affects the capacitor. The package size i.e. surface area of the package also helps in dissipating heat. |
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