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Capacitor selection question

Mr Underhill

Feb 5, 2018
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Feb 5, 2018
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Hi all, I'm new here.
I'm trying to replace 2 capacitors in a cheap flat screen tv and I'm having no luck finding any info on the brands that are in the tv. One is a "Chang cd288" 470uF 16v, -40~85°c and the other is an "Aishi cd288z" 1000uF 25v, -40~105°c
My question is if i replace these with a different brand of capacitor do I run the risk of frying the tv if there are any differences in mA at the high and low frequencies?
 

davenn

Moderator
Sep 5, 2009
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My question is if i replace these with a different brand of capacitor do I run the risk of frying the tv if there are any differences in mA at the high and low frequencies?

since you didn't mention any specific frequencies and that the capacitors are large values, they wont be working at high frequencies anyway ( ~500kHz and up)

note the values and voltage ratings and temp ratings
It doesn't matter if the voltage rating of the replacement is higher than the one on the board .... it will be physically larger so make sure there is room to fit it

Brands are choose a crappy brand ..... get replacements from a reliable component supplier
Farnell, Mouser, etc

You could use 105 deg C caps for both of them ... higher temp rating means they will likely last longer
 

kellys_eye

Jun 25, 2010
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Less emphasis on all the 'frippery' details is needed.

Simply 470μF/16V and 1000μF/25V (in either axial or radial i.e. physically matching the ones you have) will suffice. @davenn suggestion of using 105C versions is good practise and won't make much difference cost-wise.

Basically, if it fits and it's 'near enough' value and the voltage specification equals or exceeds the original then fit it and forget it.
 

Mr Underhill

Feb 5, 2018
2
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Feb 5, 2018
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Thanks for the replies, what concerned me was that the ripple currents for some capacitors were like 440mA at 120Hz and some were like 600mA at 120Hz for the same rated voltage and micro farads so idk if that was cause for concern since I didn't know any specs on the originals.
 

WHONOES

May 20, 2017
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I would go for the one's with the higher ripple current.
 
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