On Wed, 03 Jan 2007 03:31:24 GMT, James Sweet
wrote:
mm wrote:
I'm working on a Sony KV2080R 19" color, fairly old, but the question
sort of relates to all tv's.
It worked well except I heard a few cracks and saw a blue light coming
from the back of the tv. It was a spark about 1 1/2" long from the
flyback transformer to another part of that, shaped soemthing like a
BIC lighter with square corners. Is that the tripler?
As you can tell, I'm only an amateur, but I've had good results in the
past 30 years with 3 or 4 tv's and one microwave oven by covering
sparking areas with GE Silicone cement/sealant.
This time, I put on a quarter inch coat (I don't think it will dry
right if it is too thick), and let it dry 12-20 hours and then the
spark moved somewhere else on the transformer. That happened two more
times, with the spark moving each time, and then a third time the
spark was at the base of a capacitor mounted to the pcb but next to
the flyback. Coated that with GE silicone and then the spark was back
on the flyback, real short, only an eighth of an inch, and at the
surface of an earlier heavy coat of my silicone (I put a first coat of
1/4 inch on, and since I'm still having trouble this time, I've been
putting on a second quarter inch coat.)
Is this not uncommon? or
Is the high voltage too high? or
Do SONYs have higher voltage than the other tvs I've done this with?
or
Do you disapprove of the whole technique? 
or
Why is this happening this time when it never did before?
I didnt' really wait to see how many times it would spark when this
all started, because I thought it was bad for the tv to be sparking at
all, ??, so I would turn it off, but some later times it was hard to
find the spark, so I would leave the tv on, and I've noticed that
lately it only sparks about 4 times, every 10 seconds, and then it
seems to stop. This last time, it only sparks 3 times and then stops
for at least 10 minutes (when I turned the tv off each time) and
wouldn't start again if I only left the tv off for an hour or two. I
think after 12 or 24 hours it will spark again, 3 times, and stop.
I'm keeping the tv for myself, so maybe I should just live with this??
From early on I noticed that either the spark doesn't affect the
picture, or it makes one white horizontal line across the picture for
a split second.
I have half a caulking tube of of GE sealant, and I can keep putting
the stuff on until I've covered everything within 2 inches, but I
thought I should ask you guys before I went much further.
Figure out exactly where the crack is that the spark is coming from and
caulk over that. If all else fails, replace the flyback but usually you
can fix arcing problems like that.
Thanks. That's what I wanted to hear, if I was the only person doing
things this way.
Believe me, I looked each time, where the spark was at first and each
time it moved, and I couldn't see either a crack or a pinpoint hole or
even a mark. That's why I started to think the high voltage was
higher than normal.
(A couple of the places where sparks started or ended were at a
boundary of some sort, like the bottom or where the metal core met the
rubber cover. But in the other 4 cases, I could find no crack. The
spark moved every time!)
To Charlie and B:
Thanks for replying but it's really not worth buying a flyback. It's
not high def, it's going to be obsolete in 2 years, and I have lots of
tvs. This will just be a spare.
The goal of my question was to understand this, only secondarily to
fix the tv.
If you are inclined to email me
for some reason, remove NOPSAM :-)