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Capacitors????

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brainstorm:
Hi

I think it is a question of cost, with price erosion causing falling TV prices every year they have to save money, and this can sometimes cause premature failure of components when they get it wrong

Brian

scooby-doo:
Right OK, I am a little bit with you Sparky, in the fast moving industry of electronics and progression why would any company in the right mind want a tv to last as long as my Grans CRT, it would put you lot out of jobs.

Moving onto the uf I know you have a 20% tolerance, but is it more important to stick bang on what comes out of the set or do some of you throw caution to the wind and lets say fit a 1500uf where a 1200uf has been.

Turnip:
Hi,

Gran's tv probably had a 150v HT line (if a modern ancestor - failing that some 250v plus for some older gals)

Ripple current was much lower so rarely a problem.

As to capacitance value of replacement - as big as will fit the board at voltage of original - stand to be corrected but don't think increased working voltage generally equals lower ESR.

Final thought - without those dodgy caps some of us in the trade would be awful slim  - Chris.

Ohm Supplies:
As a general rule yes, its ok to use higher voltage caps as long as they physically fit (if they’re next to a heatsink your asking for problems)
Try to stick to the same values unless you have a good reason not to, it can cause problems further down the line with the repair or the set in later life.
With the repair of PSU’s I’d try to use 105degs caps, even if 85degs are fitted, some manufacturers use 85 and these can give problems, I’d also go for ones around 2000-3000 hours span if you want a bit of life on the repair.
Most caps engineers see are swollen (top or bottom) due to the electrolyte turning from a liquid to gas, cheaper caps tend to be more prone to this and as the caps that give problems tend to be the same ones in the same boards no matter what the brand used is then it does lead you to think that it’s a number of reasons that cases the fault

if you want to read some more info. on failing caps you could try the badcaps forum, although after reading you might think that capacitors are gettign the blame for everything from failing sets to why mars bars aren't as big as they used to be ( and don't even get me started on the size of a packet of Monster Munch)

regards
Andy

Turnip:
Hi Andy,

Can you justify your second paragraph ?

(Try to stick to the same values unless you have a good reason not to, it can cause problems further down the line with the repair or the set in later life.)

Just curious - Chris

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