1 Mar
2026
1 Mar
'26
12:34 a.m.
On Sun, Mar 1, 2026 at 8:28 AM Rob Jarratt via cctalk
<cctalk(a)classiccmp.org> wrote:
However, I have a VT101 and a VT102, one of them at
least uses the same Elston monitor and a different monitor board (not with Germanium
transistors). I could temporarily swap the monitor board to see if the flyback on the
VT100 is still good.But, I am worried about damaging a perfectly good monitor board. If
the flyback is shorted, could I damage the good monitor board?
Yes (and it's one of many reasons why I am against board-swapping). If
there are shorted turns in the flyback transformer you will almost
certainly destroy the horizontal output transistor almost instantly at
switch-on.
Conversely, shorted diodes or capacitors on the PCB could burn out a
good flyback transformer, but it's normally less quick than the
flyback damaging the transistor.
I would do a ringing test on the flyback transformer now. If it's good
then repair the existing monitor board, check all the diode/capacitor
circuits fed from the flyback on said board and then you just have to
hope...
-tony