Arfa Daily wrote:


"Michael A. Terrell" wrote in message
...

wrote:

On Mar 6, 7:35 am, Bob Villa wrote:
This is common to almost all flat panel power supplies. There are 4
electrolytic capacitors (same physical size) on the switching PS.
There are 2) 1000uF X 10V and 2) 470uF X 15V that usually bulge and/or
fail. You shouldn't pay more than .25to .50c for each. (I used higher
voltage on the replacements of 1000x15 and 470x25)
Symptoms of failure a slow power-up or totally dead.

Look for highest ripple current rating. Nichicon HZ, HN, Panasonic FM


Going to a higher voltage usually raises the initial ESR. That kind
of defeats the purpose of repairing the equipment.


I'm not entirely sure that I go along with that, Michael. The chart of
'expected' ESRs on the front of Bob Parker's meter, would suggest that
increasing the working voltage for a given capacitance value, produces
ever lower ESR figures, until you get up to about 100v working, when the
trend reverses slightly, and small increases are then recorded ... I've
always found that chart of his a pretty good guide.

Arfa




Even Bob P. isn't very happy with the chart - it is only a guideline,
not a code sheet...

http://www.youtube.com/watch?v=b6kgS_AwuH0

John :-#)#

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