PeterD wrote in
:

On Thu, 3 Sep 2009 04:39:23 -0500, "Mark Zacharias"
wrote:

"Alec S." wrote in message
...
Hi,

A 19" Sony from 1990 recently blew out. For the past year or so it
has been
flickering a bit, usually clearing up when warmed (I also had a
little success
by fiddling with the power cord, ie getting a better connection by
readjusting
the connector).

The other day while it was on, it began to smell like something was
burning, and
then the TV went off (I think there was a noise too). I cracked 'er
open and
took a look. I found that one of the three cement, fusible power
resistors had
literally blown. The ceramic housing was split down the middle of
the length and
the wire-wound resistor was cracked in half. (Oh, and both of the
fuses that I
could find were fine.)

As luck would have it, I happened to have an identical resistor that
I salvaged
from the circuit board of another TV from a few years ago. Like the
dead one, it
too was a 20W, 150 Ohm cement, so I replaced the dead resistor and
hoped for the
best.

Unfortunately it was only slightly better. Before, the relay would
click, but
nothing else would happen (no LED even). Now, when I plug it in and
turn it on,
the relay clicks, and there is a brief startup hum (but nothing
else), and then
it goes back to click-then-nothing at all (other than the new power
resistor
heating up). If I wait a while each time before turning it on, then
it will do
the brief hum after the relay click.

There is a 560uF, 200V capacitor nearby whose top is fairly bulged.
Unfortunately my DMM doesn't have a capacitance testing function,
but I figure
my next move is to replace the cap.


Any ideas? Thanks.


--
Alec S.
news/alec-synetech/cjb/net




I don't hink the cap is your problem. A bulged or curved plastic cover
on the top of the cap is not a failure.

It's not? Odd, virtually all caps I've run across with buldged cases
were failed.

If it's the metal can that has split at
the top (vented), fine.

And a split case (the extreme, or final stage) is not 'fine'. It is
dead.


We really need a model number to give you any more specific advice.

That said - the resistor you mention is not a typical Sony failure
that I am aware of.


Mark Z.


if a electrolytic's ESR has climbed too much,it's a "failed cap",and if
it's bulging,it's failing.


And if it's discolored badly,it's certainly suspect.

--
Jim Yanik
jyanik
at
kua.net