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Capacitor selection question

Discussion in 'General Electronics Discussion' started by Mr Underhill, Feb 5, 2018.

  1. Mr Underhill

    Mr Underhill

    2
    0
    Feb 5, 2018
    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?
     
  2. davenn

    davenn Moderator

    13,343
    1,774
    Sep 5, 2009
    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
     
    Cannonball likes this.
  3. kellys_eye

    kellys_eye

    4,281
    1,144
    Jun 25, 2010
    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.
     
    Cannonball likes this.
  4. Mr Underhill

    Mr Underhill

    2
    0
    Feb 5, 2018
    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.
     
  5. WHONOES

    WHONOES

    734
    151
    May 20, 2017
    I would go for the one's with the higher ripple current.
     
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