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Capacitors????

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scooby-doo:
Hi

Just a couple of questions regarding capacitors

Most of you know that capacitors are a common fault, I just want to understand a couple of things

Why is it ok to replace 25v caps with 35v caps?

uf Rating...how much movement have you got on the uf rating, for example lets say I have a 1200uf cap could I replace this with a 1000uf capacitor or a 2000uf cap, or do you need what it says on the tin?

And do capacitors solely fail,  is there another component on the board somewhere that is starting to overload the capacitor for it to fail?


Thanks for any advice on this one, have looked at Wiki but I am Lee Layman and get lost in translation.

sparky:
hi
its best to use same value cap's but the higher voltage
is ok
dave

Turnip:
Hi,

Agree with Sparky. Electrolytic caps usually fail because of internal heating causing them to either dry up or swell - either causes a rise in impedance and more heating. 
Reason for failure is high ripple current in power supplies of low'ish secondary voltages but high current.
Must admit I try to use the biggest low ESR cap that will fit the board - Chris.

scooby-doo:
Cheers Sparky

So why didnt the manufacturer fit 35v instead of 25v is this a cost issue, and if the manufacturer did fit 35v in the first place would this of prolonged the life of the TV.

sparky:
hi
prob they wont tv to fail
dave

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