It's not usually the flyback, but you MAY have to unsolder it, & press
it
down firmly to the pcb while soldering it, or hot glue the ferrite bar
on it.
You have to remove the flyback, SMPS, & pincushion transformers, &
coils, & coat them with hot glue. It may be misleading to find out
which
one is causing it, as touching the board, in different locations may
lead you
to find the wrong part causing it. Carefully, with the set running...if
you are
a Tech, use an insulated, plastic, or wooden stick, & gently touch each
coil, & transformer, just enough to stop the high pitch ringing. Dani.



wrote:
Hello;

After rebuilding the SMPS inside my 32" Zenith Z32X31D the other day
(lightning killed it); The past couple of days I been noticing a very
loud ear-piercing high pitch whine coming from the flyback transformer
and when I apply a small amount of pressure to the side of the flyback
transformer (using a insulated screwdriver) it stops making the noise,
then when I let go it starts back up again. So it seems when pressure
is applied to it; it will shutup. I think heat the expansion of the
ferrite core; triggers it maybe?

I sometimes hear this distinct sound when I am in stores around the TV
section. I noticed it ALWAYS made this noise since the day I bought it,
usually when the TV is first turned on for a few minutes, then it would
stop. But it's louder now than ever. Should I replace the capacitors in
the H.O.T. section also? Thanks for any feedback