11 Jul
2006
11 Jul
'06
4:50 p.m.
On Tuesday 11 July 2006 06:54 pm, Tony Duell wrote:
What core? There isn't any core in deflection coils...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
The next thing I'd do is get the TDA1170 data
sheet (it should be on the
web somewhere).
How about here:
http://www.classiccmp.org/rtellason/chipdata/tda1170.pdf
:-)
Then suspect the electrolytics associated with the
output stage. One of
them might well be shorting...
Yes.
<...>
Seems strange
to lose vertical completely though, surely? It's entirely
My thought was a fault in the vertical section that (a) completely killed
the vertical deflections and (b) loaded the supply to the the vertical
section, (from the flyback transformer), enough to much up the horizontal
side too.
Anothre thought was that the vertical fault caused a heavy current to
flow in the deflection coils -- heavy enough to saturate the core and
thus change the inductance of the horizontal coils enough to mess up the
operation of that side of things. But it's not that either -- if it was,
the beam would surely be deflected well off-screen, it wouldn't be in the
centre.