> Remote control will not start it.
In light of that, are you sure that the low power/standby power supply
is working properly? Perhaps it sustained some damage during the
failure, or a protection circuit opened up?
William
I've found that usually when a fuse is blackenend the problem is
generally close to the fuse like one of the bridge diodes. I'm
assuming you replaced the fuse and the ne one blew the same way? Look
for something dead shorted. Lenny
If you post your e-mail address, I can help you with the schematic.
--
David Farber
David Farber's Service Center
L.A., CA
I pulled the chassis to bring it home - the set is at my other house
and I did not have any tools there.
Therefore I have not replaced the fuse yet as I have nothing to
connect it to.
I was thingking about a low voltage issue because of the remote not
working, I just don't know where that fuse is in the ckt and something
is getting volts as it tries to start. Since it was near the horiz
section I made an assumption. could be wrong.
Don't know if the whistle I hear is the horiz freq or the switching
supply.
tipsnews at nc.rr.com
thanks David.
I was thinking that is was the AC line fuse that was blackened.
however from what you said it doesn't sound like it. I don't know what
other fuse you could be referring to other than a small chemical fuse
on a 27 inch set though. Lenny.
the AC comes in on the right, passes thru some rectifiers and large
caps etc. There is a small metal box on the left which I believe has a
switching PS in it - haven't opened it yet.
The fuse is about in the middle on the back edge - a mini fuse - just
about where the horiz section starts - the HOT is on the left side
near the box.
I don't see another fuse and none near the ac line.
Most common failure on these is a shorted flyback. Chuck
How is it usually checked.
There is no continuity between coils at DC.
coil resistance seems within reason but as low as it is that probably
isn't a very good test.
I haven't got one laying around to sub.
It is, after all, 24 yrs old. But the CRT is still OK.
Can they be had and at what price????????
If you have a scope with a ten times probe, set the V. input for the
highest voltage possible and the H. rate at 20 us and connect the
probe to the HOT collector after plugging the tv into an isolation
transformer. Replace the blown fuse and turn on set. If there is
ringing between the HO pulses, power the set down immediately and
order a flyback replacement. I'd check MCM for a replacement. If
they don't have them, sometimes an Asti flyback will work in a Sony
set. (I haven't had any luck with them for other brands.) Chuck
I have checked all semis with an ohmmeter and find nothing unusual.
The set is 24 yrs old and neer had a problem.
Caps all respond properly to an ohmmeter. I could pull some parts and
ring them with ac but....
What is the probability a fbt will fix it??
thx
Shut downs are a pain in the ass. I've done some of those 300 mile
deals as well and they aren't much fun either. So you have no CRT or
yoke and no jig I take it. Pull the flyback and take it to a shop that
has a ringer. Perhaps for a couple of bucks you may be able to get a
sympathetic tech to ring it out for you. At least that way you won't
have to hold your breath ( too much) on the return trip. Lenny
I finally got the flyback and put everything back and it works
perfectly.
No there parts needed, 'cept the fuse.
You are welcome. Chuck