capacitor help

[tickle me elmo]

i need to replace 3 16v 220uf caps in my freeview box because the tops have puffed out(but not leaking). what values can the replacements be ? i know they can be more uf's but by how much i dont know ive a few dead mobos i thought i could pinch a few off, some 6.3v 1000uf although voltage might be too low!

 

[KotFM]

Don't use caps with a lower voltage rating, otherwise it's roman candle time.
I'd stick to using the same value in microfarads if I were you.

 

[tickle me elmo]

Don't use caps with a lower voltage rating, otherwise it's roman candle time.
I'd stick to using the same value in microfarads if I were you.

well i might not have any that are 220uf.

also the circle on the pcb that u solder them to, is the shaded half the positive side of the cap ?

 

[Mickey_D]

16 volt 200 picofarads sound like signal smoothing types, I wouldn't change the value at all if it was me.

Might induce some wierd effects on tuning or image quality depending on where they're at.

If they're in the power supply (rectifier) area, they can be just about anything.

But in any of the sections mentioned, DO NOT go with a lower voltage. A little higher is ok, but only up to about 24 or 25 volts. I wouldn't go any higher than 30 volts. As for the farad value, I wouldn't go 10% either way if they're in the tuner or video area, 50% in the power supply.

 

[KotFM]

The shaded bit is usually the negative, as far as I am aware.

 

[Mickey_D]

Yes, shaded side is negative.

 

[tickle me elmo]

16 volt 200 picofarads sound like signal smoothing types, I wouldn't change the value at all if it was me.

Might induce some wierd effects on tuning or image quality depending on where they're at.

If they're in the power supply (rectifier) area, they can be just about anything.

But in any of the sections mentioned, DO NOT go with a lower voltage. A little higher is ok, but only up to about 24 or 25 volts. I wouldn't go any higher than 30 volts. As for the farad value, I wouldn't go 10% either way if they're in the tuner or video area, 50% in the power supply.

well the picture rolls and flickers quite often, so they must be there to smooth the signal.


KotFM The shaded bit is usually the negative, as far as I am aware. <--- well the caps have a band down the side thats soldered to the shaded part of the circle and asfaik caps only had the positive side identified by a longer leg or a + symbol.
i dont really want to solder some in the wrong way

 

[KotFM]

All the caps I've seen have the positive identified by the longer leg, and the negative with a band. There's usually some small minus symbols in the band as well.

 

[dymetrie]

Energy Management lvl 5
Energy Systems Operation lvl 5

Hang on, this isn't the eve-online thread!

*runs*

 

[tickle me elmo]

All the caps I've seen have the positive identified by the longer leg, and the negative with a band. There's usually some small minus symbols in the band as well.

ah yes, there are minus symbols in the band!

 

[Skully]

Energy Management lvl 5
Energy Systems Operation lvl 5

Hang on, this isn't the eve-online thread!

*runs*

Funny.

 

[Richard Slater]

Hang on, this isn't the eve-online thread!

That would be this thread