29 Apr
2017
29 Apr
'17
11:36 a.m.
Since it doesn't smoke, I'm thinking the
horizontal sweep
transistor may have gone out. It may have shorted, which
then may have burned up the primary winding in the flyback
(if left on long enough). I'd check that transistor for a
short, and then you can trace a few traces to identify the
primary terminals on the flyback and see if they are an open
circuit.
Hmm, not good news. zero ohm between pin one and three of the transistor
you mentioned. To be fair the board around it looks a little brown, but
I assumed this was just because it would have got hot. Could replacing
this cause damage to the flyback? I seem to have a low resistance on
what I think is the primary coil.
I am wondering if there was also a power surge when we had the power
failure that killed the terminal. If so, perhaps this is the only reason
why the transistor may have died.
Thanks,
Aaron.