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electrolytic failures

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ex ttg:
Hi all
Years ago electrolytic failures on LT rails were something of a rarity.But now it seems that every lcd tv PSU more than 18 months old is littered with domed caps.Is this down to the proximity of the rear cover causing insufficient airflow or insufficient heatsinking again for rear cover manufacturing purposes?
With the crt tv's generally the high voltage caps(HT,200v rail etc) or SMPS start-up gave the problems.
Why now do we carry a bucket load of 1000uf 25v caps with us wherever we go?The caps we replace are invariably 105 c as well but LT caps way back were usually 85 c and happy.
Has anyone else given any thought to this?
Whatever the reason,here's hoping the manufacturers don't correct the problem.
Nick

chammyman:
I know what you mean, I have changed caps on amps from the early 80's and only a couple were faulty, but a 2 year old pc motherboard all of them are bulging ready to pop.

I just thought price dictated the new stuff as rubbish, down to a price not up to a standard anymore.

Heat I don't think is a main issue as some of the stuff you see thats years old is under inche sof dust and they are fine but theres no coolign airflow.

SUPER8:
GOD BLESS ALL MANUFACTURERS :clap: :clap: :clap:

Turnip:
Hi Folks,

   Totally agree with all said, most succesful and profitable LCD Tv and monitor repairs seem to be in the P/S and invertor areas where high temperatures and ripple current provide income. Note that with computors stuffed with cooling fans, power supplies seem quite reliable. Lets hope Tv manufacturers don't cotton on.

    Incidentally, the local tip can be most useful for modern spares, only drawback seems to be Health and Safety concerns, preventing sites from being greener.

  Chris Steele

broggsy:
my samsung lcd tv is a designers nightmare.The hottest parts are at the bottom and as the heat rises from this area it warms (ahem)  the electrolitics up as it journeys to the vents at the top of the back panel.
oh dear, as a retired r&d engineer this stinks as much as early motor car r &d engineers designing rust points so that cars didnt last that long (so i've been told). 

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