Quick recap:
27" MTC (MTV-2800s) television
replaced blown fuse
transformer in power supply squeals
no sound, no picture, no pic tube filament lighting

checked/replaced caps, incircuit checked diodes
checked switching circuitry transistors

Front LED (red) lights up.

I'm pretty well convinced the power supply is able to
function. The fuse that blew seems to be for the B+

Question:
D1398 (horizontal output transistor with damper diode) -
I've taken it out of the TV and I've no silly scope. I'm not
convinced it's in good working order and I wonder if it could
be the culprit. Is there a way to test this thing with a meter now
that I've got it pulled out of the TV? And could it cause the
symptoms I've listed above?