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capacitor temperature

 
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cole70



Joined: 19 Jul 2009
Posts: 1

PostPosted: Sun Jul 19, 2009 6:29 pm    Post subject: capacitor temperature Reply with quote

I have a samsung lcd that has 3 blown capacitors on the power supply board. This is a common issue with my model. I would really like to get this tv working again today, but the only capacitor I can find (1000uf 35v 85c) has a lower temperature rating than the original (1000uf 10v 105c). I've gone up slightly in temperature and voltage before when replacing capacitors, but never down. What sort of issues could arise from this? Besides shorter lifespan. thanks[/code]
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Sun Jul 19, 2009 8:16 pm    Post subject: Reply with quote

Here's a thought, use the ones you have untill you get the correct ones. Don't put back 10 volts replace them with either 16 or 25 volts. I use [email protected]'s. I did 3 yesterday. It will be fine untill you replace them again. If your that consirned leave the back off, just remember to put at least one of the four screws back in the base so it doesn't tip over.
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Mon Jul 20, 2009 2:27 am    Post subject: Reply with quote

Depending on the amount of heat generated by the adjacent components, using 85c instead of 105c may have a shorter life span. Like minnie said, the voltage rating is much more critical and best to go higher than the original. Due to various cost factors, capacitor voltage ratings are often selected with little or no headroom thereby causing premature failures.
Temp rating is mainly considered for "longer component life" due to possible exposure &/or close proximity to heat generating devices within a circuit.
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Dan the TV man
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PostPosted: Mon Aug 24, 2009 7:44 pm    Post subject: Capacitors Reply with quote

You can get 35 volt,1000 uf,105s at Mat Electronics.10 for $1 each.
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Fri Aug 28, 2009 8:11 am    Post subject: Reply with quote

In case of electrolytic capacitors in a switched mode power supply, it is more important to make sure that you get a low-ESR part than that it has the correct temperature rating.

Also, make sure that the capacitors you are going to buy can withstand enough ripple current.

Beware of the cheapest low-ESR types, they usually have no better typical data than a standard electrolytic, the only difference is that the manufacturer does state and warrant a ESR value.

As you see, one has to read the manufacturer's datasheet very carefully in order not to get in later trouble with electrolytic capacitors. And don't buy capacitors from a vendor which cannot state the manufacturer and model designation of his capacitors.
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jts1957



Joined: 24 Nov 2008
Posts: 2475
Location: Far, Far Away

PostPosted: Fri Aug 28, 2009 8:48 pm    Post subject: Re: Capacitors Reply with quote

Dan the TV man wrote:
You can get 35 volt,1000 uf,105s at Mat Electronics.10 for $1 each.


Is that 10 for $1.00
OR
$10.00 for 10 Question
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