Hello all, thanks for looking.
I've been given a Commodore 1084s-D1 that had a high-pitch whine, smoking and smelling of burning. I discovered that it looked like something was leaking out of the flyback.
What I've done so far:
Removed the flyback = No whine or burning, I think the monitor switched on OK (apart from no picture
)
Replaced the flyback = switched on for a second, still get high-pitch whine, but no burning smell or smoke.
Remove the HOT, tested it in my component tester which says it's a diode between B-E but also says it has a 298pF capacitance. Tested it by meter, E-C Diode affect. B-E 37ohm. B-C Diode affect.
With removed HOT, removed deflection Yoke connection and removed the neck board from tube (but still wired to flyback) = switched on for a second, still get high-pitch whine, but no burning smell or smoke.
I've ordered a new HOT, but not sure of my next move because if it still whines without the HOT on the board, I can't see fitting a replacement HOT will help.
I don't think I should leave the monitor on to take voltage tests, because I'm sure that whine must be straining the new flyback.
I didn't really want to remove the flyback again, but I guess it will be difficult to test for shorts with it in, because I will get readings throw the coils.
What would be the best next move? BTW: I know the flyback produces high voltage and the tube and capacitors can hold a charge