"David" wrote in message
...
If it is on 3 seconds or so, the micro is not seeing either the h-pulse or
the v-pulse to tell it that both circuits are running. Since the flyback
was back look for a line that goes to a zener diode that gets buffered and
goes to the micro for the h-sync pulse.

David

Thanks David, I'll give it a look. I have a raster for those 3 seconds,
just no video. However, I can see faint retrace lines in the raster, but
it's hard to tell if that might just be the screen control set too high,
since all I can see on the screen is the on-screen menu for those couple of
seconds. Anyway, I'll check it out. Thanks again.


BigMike wrote in message
m...
Hey guys, left a post about this Sanyo 31" DS31650 TV a while back, that
had
a bad flyback and HOT. After replacing the set would turn on, but only
for
about 3 seconds and then turnoff. Repeating pressing of the on switch
will
get the tube to light up enough to show there is a raster, but no video.
Sound is fine. The customer decided to buy a new set right after this
one
was brought in to me, and said he was in no hurry to fix it, so I set it
back while I had more pressing things to work on. Now I would like to
get
it
out of the shop. Before I order a schematic on this thing, I was
wondering
if anybody had at least enough info on this chassis for me to take a
crack
at fixing it without the schematic. The problem is the set won't stay on
long enough to do much. I'm sure the micro is tripping the set and
shutting
it off, but I don't know if it might be the micro itself, which some
have
claimed to replace and solve this problem, or whether the lack of a
video
signal, is tripping the micro. If anybody has any info, schematic, or at
least the correct voltage points/waveforms to check that would cause the
micro to shut down, it would be appreciated. If not, I'll probably just
order the schematic and a new micro. I just hate rapping much money up
in
this thing, since I doubt it will have all that much more life left in
it.
Thanks!