Posted by JosephKK on 11/11/07 05:44

Bob Myers nospamplease@address.invalid posted to rec.photo.digital:

>
> <panteltje@yahoo.com> wrote in message
> news:1194441321.752773.311000@57g2000hsv.googlegroups.com...
>> No, I doubt that, as I mentioned electrolytic capacitors, solder
>> joints
>> due to thermal stress, all have a shorter life.
>> It depends a bit on how you define 'life' in this case,
>> a bit less brightness from CRT phosphors is easily compensated by
>> a bit more drive (say contrast) and or brightness.
>
> Good point; I'm using "life" in the sense of what ultimately
> winds up taking ALL monitors out of service - i.e., not
> just those factors that would come up in the sort of failure
> that would cause the unit to be serviced and then returned
> with more useful life left in it. In other words, look at the
> history of all monitors in the field, including both the relatively
> early "hard failures" AND what ultimately causes the unit
> to leave useful service.
>
> Individual electrolytics, while they're certainly not among
> the most long-lived of components, aren't really all that
> bad in terms of MTBF IF they are not subjected to
> excess thermal or electrical stress (i.e., I'm assuming a
> reasonably conservative design). But I would certainly agree
> that they (along with the horizontal output transistor that
> someone else mentioned) definitely contribute to their share
> of monitor/TV failures, esp. in designs that are...ummmm...
> shall we say less than optimally designed? :-)
>
>> I do notice, as some other poster also remarked, that I
>> need to run the the Samsung LCD at zero to 30 percent
>> brightness, as it is extremely bright (indoors, artificial light).
>> Maybe running the CFL tubes at <= 30% will extend their life, wait
>> and see.
>
> Well, it certainly can't hurt. Like CRTs, CCFLs are
> basically producing light via phosphors, and are subject
> to many of the same aging factors.
>
> Bob M.

Kind of a clued-in guy, have you ever heard of madman Muntz?

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