On Feb 22, 1:34 pm, Jim Yanik wrote:
"James Sweet" wrote innews:iADvj.13$A93.12@trndny08:





"packrat79" wrote in message
..
.
Some years ago, I built the flyback tester that was described in
Sams FAQs - the one with the simple two-transistor oscillator,
connected by winding your own 10 turns onto the flyback core. The
flyback is of course tested out-of-circuit. Over the years it has
been quite accurate, but the results with one recent flyback are
rather inconclusive, and I thought maybe you could give me some
advice.
I don't have the model # of the set handy, but it's a 36" Sony made
in 1998. It came in with a blown HOT and switching regulator, so
naturally the flyback was the first thing I suspected.
Normally when a flyback is tested with this device, it will produce
a decent-looking arc of about 1/2". The flyback in question, however,
seems to produce a weak arc of less than 1/4", and it doesn't have
the "sizzle" and thickness I normally see with this test. Given the
size and high voltage requirements of the CRT, I expected a lot more
from this flyback (if it's good, that is). Would I be right to
suspect it as bad?
I really don't want to replace the other components and leave the
original flyback installed, because if it's bad, as you know, it will
just take out the other components again (nice design, Sony).
Any advice would be appreciated.

How much is a new flyback? A while back I replaced one on a 32" Sony
which was arcing internally, it was surprisingly inexpensive and fixed
the problem.

I recently put a new flyback in a 12" TV,it cost less than $20 from Acme
Enterprises. My old FB smoked.

--
Jim Yanik
jyanik
at
kua.net

So chances are it probably is bad huh? That's what I figured. However,
Sony has discontinued this part, so a generic replacement will have to
do (I could only find one supplier, with one left in stock). I didn't
think Sony discontinued parts so soon, but I guess that's the trend
these days.